Niklaus Mikaelson

He shares more children with other parents. Niklaus Mikaelson is the Original Werewolf-Vampire Hybrid. He was born of an affair between Ansel and Esther Mikaelson and is the stepson of Mikael.

He is the father of Hope Mikaelson, Grace O’Connell-Mikaelson, Roxanne Lynch/Hook and more. He is the husband of Camille O’Connell-Mikaelson.

He has six half-siblings: Elijah, Kol, Rebekah, Freya, Finn and Henrik one adoptive sibling, Sophia, and is also the adoptive uncle of Danielle.

Klaus had reclaimed New Orleans to what the Originals (except Sophia and Danielle) once called home. He works together with Marcel to rule the French Quarter.

He is close friends with Caroline Forbes whom he is in love with and best friends with Marcel Gerard.

For over a thousand years, Klaus had been trying to break a curse placed on him. He created the myth of the sun and moon curse in order to find the moonstone and the Petrova Doppelgänger, both of which were needed to break the actual curse. His goal was to liberate his werewolf side so he could sire his own super species of werewolf-vampire hybrids.

In 1492, he finally got the chance to break his curse when he met Katerina Petrova, the final piece necessary to break the curse. However, Katerina managed to foil his plan to use her in the sacrifice by turning into a vampire. For the next 500 years, Klaus searched for a way to break the curse without the doppelgänger, forcing generations of witches to help him. During his search for a way to break the curse, Klaus hunted down his family and neutralized them. He also hunted Katerina, who had escaped him and stolen his moonstone. However, it should also be noted that he was also on the run from his step-father, Mikael, as Klaus had an abusive childhood.

Besides his family, during the 1920's, Klaus formed a strong bondand brotherly relationship with Stefan. He then met with the vampire, Caroline Forbes, and starts to care about her, eventually falling in love with her and tried to win her love, and after a long time they were friends. In New Orleans, he had a father/son bond relationship with Marcel whom he works with in ruling New Orleans until Klaus discovered his treachery for bringing Mikael to New Orleans. They reformed their friendship when Marcel saved his daughter and they worked together to bring down their enemies. He also cared for the bartender Camille O'Connell, with whom he had fallen in love before her death.

Early Life

 * Main article: Timeline
 * Human Life
 * 1002
 * 1114 A.D.
 * 1300-1500s
 * 1700s
 * 1800s
 * 1900s

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Mystic Falls, The Middle Ages, 10th Century
Niklaus Mikaelson was born to Esther and Ansel in a small village that would eventually become known as Mystic Falls, but was raised by his step-father Mikael, both believing he was his true father. Niklaus has six half-siblings fathered from his step-father Mikael, a Viking warrior and wealthy landowner who moved with his wife, Esther, to the New World after their home village was devastated by a plague. Mikael believed his beloved first born daughter Freya was a victim of it, not knowing she was taken by Esther's sister Dahlia as payment for a fertility spell to let Esther have children. Klaus was close to his family with the exception of Mikael. Mikael was inordinately hard on Klaus, having become an aggressive, violent, and strict man after he thought Freya died, always trying to teach his children to survive so he would not lose another child. In Klaus' case, Mikael was abusive to him for his impulsive and reckless behavior, justifying that his punishments would make Klaus stronger, but Mikael was only ever disappointed in everything Klaus did and beat him repeatedly throughout his mortal life. Elijah said that, as a mortal, Klaus was full of love and wanted to be loved in return. After becoming an Original Vampire and werewolf hybrid upon triggering his werewolf gene, his amplified temper and emotions, along with the psychological damage of Mikael's cruelty, turned Klaus into a violent and cruel person, much like his step-father Mikael. Many years before, his mother had an affair with a man from their neighboring village, whose inhabitants were known to be werewolves, men who transformed into wolves on the night of a full moon. Once as kids, Elijah takes Niklaus into the woods to teach him how to hunt. Elijah encourages his brother,  stating that his aim has been improving, when he misses a shot; however, Mikael intervenes and scolds Elijah for encouraging his brother and snatches the bow from Niklaus, stating that he wasn't man enough to hold a weapon. Niklaus tries to apologize, but Mikael sees him as a weakling and starts kicking him. Elijah tries to stop his father from hurting his brother but he is scared off by Mikael who stated that if Elijah intervened he would be next
 * }

He was once beaten, half to death, as a boy, when his father's blades went missing. In the days following the incident, Rebekah was particularly kind to him, which Klaus later realized meant that she had been the one to take them.

Niklaus and all his siblings used to play in the woods when they were kids, showing they all loved each other dearly. He even stayed awake, to comfort a scared Rebekah by holding her hand during a stormy night, and giving her a carved wooden knight, which he made for his father, stating that it will protect her, something that he has kept safely to this date as memento of his childhood.

Esther found a young Klaus in the woods once when he was hiding from Mikael, as Mikael wanted to bring him along to hunt, but Niklaus was afraid to go with Mikael. He was afraid so she gave him a necklace which he believed would protect him and remind him that Esther will be with him always and forever. A few years later, Mikael hurt Klaus in the woods during a fight between them, with Klaus starting the fight by believing that if he beat his father once, Mikael would show his approval to Klaus. Esther helped Klaus to heal. Klaus told her about the fight and that Mikael wanted to take his necklace she gave him. Klaus found out that the necklace made him weak, not strong. Because of Esther's spell, Klaus was weakened and his anger suppressed as she didn't want him to be strong, kill somebody and trigger the werewolf gene. This would reveal that Klaus was not Mikael's son, and she feared Mikael would kill them for her unfaithfulness and betrayal.

Both Niklaus and Elijah were in love with Tatia, even though she had a child with her husband who died in battle. They both vied for her attention and even had arguments and traded blows over her. She eventually chose to be with Elijah. Centuries later, Elijah finally told Niklaus he killed Tatia. Niklaus was very angry with Elijah over this, but he chose to forgive him. They later found out that Tatia's blood was used for the Immortality Spell placed on them, being the doppelganger of Amara, the world's first Immortal woman, as her blood was a powerful tool for a witch's spells.

Niklaus was once flogged by Mikael severely for taking his knife to carve chess pieces. When Elijah comes in and tries to stop his father from beating Niklaus to death, he gets pushed back. Rebekah then intervenes by threatening to kill their father with a sword if he doesn't stop beating Niklaus. Mikael snatches the sword from Rebekah and leaves in a rage.

When Niklaus and his brother Henrik went to see the wolves transform, Henrik was killed by one of the transformed werewolves. Devastated at the loss of another child, Mikael convinced Esther to use her magic to protect their remaining children. Upon Mikael's request, Esther performed a spell, called The Immortality Spell, which transformed Niklaus, his siblings, and his step-father into Original Vampires, the first vampire's to exist, and progenitors to the vampire species.

When Niklaus made his first human kill, his werewolf gene was activated and he became a vampire and werewolf hybrid, thus revealing Esther's infidelity. Soon after becoming a Hybrid, Mikael had Elijah help him restrain Niklaus, and Esther to use her Dark Magic to place a curse on him which forced his werewolf side to lie dormant, and then rejected and abandoned him.

Mikael then hunted down and killed Niklaus' father and his entire family, not realizing that doing so would ignite a war between vampires and werewolves that has been perpetuated across the ages. In retaliation for the curse and rejection, Klaus murdered his mother and framed Mikael for the act.

After killing Esther, his family scattered and Niklaus stayed behind with Rebekah to bury Esther. Rebekah promised to never turn her back on him, like Esther did and so did Elijah. They swore to each other they would stay together always and forever.

Powers and Abilities
As an Original Vampire, later the Original Hybrid, Klaus is the second strongest of the Original Vampires, second only to his step-father. His Werewolf side has given him additional powers and advantages the others do not possess, making him the one of the most physically powerful immortal beings in the world. Although stronger than his maternal half-sibling due to his werewolf heritage, some of his siblings have been shown to be willing to fight with him with no fear, with Elijah actually able to do so on almost even terms, Elijah seems to have no difficulty trying to start and end fights with Klaus, usually having the upper hand on Klaus himself for a short period of time; before the latter turns the tables on Elijah. Klaus' step-father being notable for surpassing him and whom he initially feared greatly; made worse when Mikael had possessed the White Oak Stake. Klaus’s powers  improve with the consumption of human blood, assuming his werewolf form or utilizing his lycanthropic enhancements and the full moon. It is shown that Mikael was slightly stronger than Klaus, and it should be noted that Mikael was still affected with werewolf venom and Papa Tunde's Blade, therefore not even at full strength yet still demonstrated superior strength than his son. With the death of Mikael, Klaus was at the time the single most physically strongest being around, however, after Lucien and Marcel took the serum and become the Beasts, they had outmatched him in sheer power. Klaus currently remains the second strongest.

Even before Klaus became an Original Vampire, later the Original Hybrid, he was a fairly skilled swordsman, even though he rarely uses a sword, due to his supernatural powers, Klaus' swordsman skills have not diminished

Klaus has shown to be an expert fighter even when unarmed; When Marcel's army took him on, despite being overwhelmed to begin with, he was able to fight them, almost evenly and overpowered most of them, through his fighting skills and original hybrid powers. In that single fight, he killed roughly twenty four non-Original vampires single-handedly, showing his skills as a combatant even further. Klaus is far less calm, composed, and strategic in battle than Elijah but has a better mind for coming up with long term plans and back ups, being nearly always one step ahead of his enemies. Due to his long existence, Klaus has seen countless battles and is very experienced in battle. Klaus was able to take out six evolved werewolves without any difficulty, when he faced off against Hayley and Jackson, although he had some difficulty taking them both on at the same time, he ultimately got the upper hand; overpowers and defeats them.

His supernatural attributes aside, Klaus' greatest asset is his sharp intellect. His penchant for strategies and forming contingencies way ahead of time, despite the fact that Elijah's penchant for strategies and forming contingencies surpasses his, Klaus has outsmarted Elijah on more than one occasion, Klaus is able to discern a great deal of whatever or whoever is presented to him after only a few keen observations, he was able to figure out that Hope would be sacrificed at the cemetery because it was where the Harvest and the Reaping took place as well as the location of the ancestral witches' burial place, He was able to deduce that his mother was possessing Cassie, he also came up with a plan, to make it look like he has turned against his maternal half-siblings and Hayley, after Elijah daggered him, and after Hayley tried to take his daughter Hope away from him, in order to gain Dahlia's trust to take her down. According to Dahlia, Klaus is arguably the most intelligent of his maternal half-siblings with Elijah occasionally rivaling him.

Weaknesses
Klaus has some of the typical weaknesses of an Original Vampire and a Werewolf.

Elijah Mikaelson

 * "Listen to me. You have to be strong. We need you."
 * —Elijah to Klaus
 * Main article: Elijah and Klaus
 * Elijah is Klaus' maternal older half-brother. As humans, they were close, engaging in friendly sword fights, however their relationship became strained due to both falling for the same woman, Tatia. After transitioning into vampires, along with their sister, Rebekah, they made a pact to always stick by each other "Always and Forever". In 1492, their close relationship crumbled upon the arrival of the doppelgänger Katerina Petrova. Klaus wanted to use her blood to break the Hybrid Curse, but after her escape, Klaus was furious and blamed his half-brother. Although Elijah promised he would find her, their relationship never recovered as in 2010, Elijah planned to help the Salvatores and Elena Gilbert kill Klaus. After Klaus broke the curse, at Elijah's mercy, he revealed that he didn't kill their family and that their bodies were safe. Elijah saved his half-brother's life, however was neutralized in return. Their bitter relationship continued after Elijah was un-daggered by Damon Salvatore. However, the half-brothers became allies after their mother returned and were unsure of her intentions regarding their family. Elijah bargained for his half-brother's body back and was clearly devastated by his "death". Throughout the trials and tribulations which threatened to rip their brotherly bond, they have recently begun mending their relationship and even though Klaus refused to grant Katherine freedom by Elijah's request, Elijah has stated he won't give up on finding Klaus' redemption.
 * Unfortunately, Klaus' relationship with Elijah takes a turn for the worst when Elijah chose to believe Tyler's lies over him, that he is (supposedly) aware that his child's blood can make hybrids, and he plans to use his child's blood once she is born to make an army of hybrids, to take over New Orleans, Elijah falsely accused him of only caring about his unborn child, so he could use her to sire more hybrids, Klaus became hurt/enraged by the accusation, he violently bit Elijah in retaliation, their relationship became damaged after this. Klaus eventually forgave Elijah, when he apologized to Klaus for his accusation. Despite the fact that their relationship is now repaired, Klaus is barely on speaking terms with Elijah.

Unfortunately, their relationship becomes worse than ever, when Elijah daggered Klaus and allowed Hayley to try and take Hope away from him, in retaliation Klaus kills his half-brother's girlfriend Gia, and daggered Elijah with Papa Tunde's Blade, their relationship becomes estranged/broken after this, as they both want nothing to do with each other any more.

They reconcile after allying together to stop the Trinity.

Rebekah Mikaelson

 * "He saved us"
 * —Rebekah to Elijah about Klaus

Main article: Klaus and Rebekah

Rebekah is Klaus' maternal younger half-sister. Out of all his half-siblings, he is closest to her, and very protective of her. Klaus cares very deeply for Rebekah, but he seems to have a lot difficulty showing her that it is true. They are loyal to each other. Before she left New Orleans, thus separating, they had never left each other's side and stood by one another no matter what happened. After Klaus was "supposedly" killed by Alaric, Rebekah was heartbroken over losing her older half-brother whom she loved and never left her. When she finds out  that he was still alive, their relationship started to completely and totally fall apart when he chose to save Caroline over his own half-sister. Rebekah confronted him about how she never stopped loving him through everything. It was always her that was there for him when Finn, Kol and Elijah weren't. She then realized that he truly doesn't love her when he told her they are no longer family, and disowned her. But later, Klaus saves her when Kol nearly kills her with a White Oak Stake. Even when she hates him, Klaus shows that he still cares and loves her regardless of what has happened between them. After Klaus is again the King of New Orleans, she begins to form her own army and so to defeat Klaus and Marcel, since she tired of always being used by them. Nevertheless, Rebekah has tried to protect the daughter of Klaus at all costs. When discovering that it was Rebekah who brought their father to New Orleans, he decided to get revenge and wanted answers. She admitted that she wanted him dead as he robbed her of love and happiness. Klaus chooses not to kill Rebekah, but he exiles her from New Orleans permanently, possibly Klaus sees killing Rebekah too merciful; he indirectly threatens to kill Rebekah with the White Oak Stake, if she ever returns to New Orleans. Klaus decided to entrust the safety of her daughter to Rebekah, she returned to New Orleans to take Hope with her and care for her.

Kol Mikaelson

 * "You're desperate to be apart of this family, aren't you? All your mischief was just attempts for attention."
 * —Klaus to Kol


 * Main article: Klaus and Kol

Kol is Klaus' maternal younger half-brother. Kol and Klaus both have a short temper. It is known that Klaus daggered Kol over a century ago. Kol and Klaus seem to argue every time they talk to each other, Kol even joked to Klaus about his dagger threats showing he was not over being daggered for a century. Even though he had been daggered for a century, he quickly got with times as he was seeing playing a video game perfectly. Klaus and Kol both like to drink together and have brotherly bond. Klaus cares deeply for Kol as he was rushing to his body when the Mystic Falls Gang daggered Kol. Kol seems to ruin many of Klaus plans like finding the cure for vampirism, by killing Shane and the newly turned vampires. Finn reveals to his brothers that Kol is alive, and Klaus expresses disbelief that Kol would have gone along with Esther, stating that the only thing Kol listens to is his ego, but Finn confirmed Kol's supposed loyalty, saying that their mother's proposition had brought even the wildest of Mikaelsons onto her side. Kol later switches loyalties over to Klaus and Elijah. Klaus and Kol have been seen getting along at time since then, and fighting at others. They seem to banter often and in good fun. Klaus was furious with Kol for hiding where he hid Rebekah, and threw him to hungry vampires in his anger. But Klaus forgave him, when Kol was cursed by Finn. After all, everything Kol has ever wanted was his family to care about him. This wish came true when Kol died because of the curse. Klaus was there on his side, together with Rebekah and Elijah. Before Kol died he wanted Davina to leave him alone, but his three siblings came and Klaus said that Kol can't just flee from "Always and Forever". He died in their arms, as a part of the family. When Kol was brought back, Klaus hugged him even though Kol protected Davina who Klaus wanted to kill.

Hope Mikaelson

 * "My dearest Hope,

I do not know how this will find you. As a child full of wonder, a teenager full of opinions, or as a woman with the world at her feet. I write to tell you I love you, and to explain that in our family's darkest hour, I was called upon to save my siblings, and so I did. Please do not mourn me, whatever pain I endure, I do so in service of those I love. My sole regret, is that I will be away from you. Be good to your mother. I draw comfort knowing that she will protect you. And I know she will not rest until our family is united. Until then, my sacrifice will allow you to grow. To become the beautiful daughter I can now only imagine. Please remember you are the legacy this family has always desired. The promise we fought to protect.

You are, and always will be, our Hope."
 * —Klaus to Hope in a letter


 * Main article: Klaus and Hope

Hope is Klaus's daughter and child with Hayley. In the beginning Klaus wasn't happy with the arrival of his baby, then with time he started to change his mind and began to worry about her safety. He looked happy when Hayley told him that the baby would be a girl, then he began to fight for her protection against his enemies. Now he loves her more than anything and in order to protect her from the people that are trying to kill her, he and Hayley decided it was best to send her away. She was given to Rebekah, who would keep her safe. Klaus was reunited with Hope when her safety was compromised. Hope is now living at home with her parents. The supernatural community is now aware of her existence.
 * Hope and Klaus' bond remains strong during the rest of the series until they were seperated due to Klaus sacrificing himself to save his family. Klaus feared that Hope would reject him upon being saved from Marcel's captivity. But, apart from some bad things he's done, Hope knows what Klaus is and isn't afraid of him. Hope's memory of Klaus was kept alive because of her mother telling Hope about her father such as his loyalty to his family, his love for her and his interests that she now shares with him.

They were reunited after five years and, despite some initial nervousness on both sides, they shared a lovely day together, it showing just how alike they are. Klaus shared stories from his long life, Hope showed him her magic when she healed a butterfly and they painted together. She knows how strong he is and, because of that, she believes he can keep bad things away.

Once he promised that nothing was going to harm her, Hope hugged him. Despite their time apart Hope calls Klaus 'Dad', showing that their bond is still strong.

Because of her mother telling her about her father, Hope deems Klaus her 'fairytale prince'.

Hayley Marshall-Kenner

 * "Some time ago, I refused to trust you with our daughter. I took you from Hope. I was wrong. Take care of her."
 * —Klaus to Hayley

Main article: Klaus and Hayley

Klaus and Hayley first interacted  when Hayley first visited Tyler in Mystic Falls, being the one who helped him break his Sire Bond. Klaus initially believed her to be a fling of Tyler's whilst in the Appalachians, however it was revealed she came to Mystic Falls in a deliberate attempt to have Klaus murder his hybrids, in exchange for information on her family. She succeeds and disappears, only to come back where Klaus saves her from a vampire sent by Katherine to kill her. Klaus takes her back to his house, after talking a lot Klaus received a call form Rebekah, he tells Hayley that the vampire  lurking around to kill her is dead. Even though she had to go, Klaus offers her to stay. She agrees and they end up having sex. Klaus tells Hayley he knows something about her family after noticing a special birthmark on her shoulder. Hayley ends up in New Orleans where she finds out that she is pregnant with Klaus' child. Not keen to the idea at first, Klaus has shown to care about his child in more than one occasion, fearing that someone might try to take her away from him. The relationship between Klaus and the mother of his child has evolved along the series, both coming to a mutual understanding, while Klaus also shows that he cares about her. After her encounter with Klaus' step-father Mikael on the other side and nearly killed by him along with her baby, Hayley is shown by Klaus their child's nursery after Hayley decides to move back to the compound. Klaus and Hayley share a moment in which Klaus asks her what Mikael has told her about him, Hayley tells him "Nothing true", which shows that they now have a good relationship. Klaus and Hayley are friends and they work together in order to keep their child safe.

Unfortunately, Klaus' relationship with Hayley takes a turn for the worse, when Hayley tried to take Hope away from him, in which Klaus became hurt/enraged by this attempt, that he had Dahlia place The Crescent Curse on Hayley and her pack, as punishment for trying to take his daughter away from him. After a few months Hayley is reunited with Hope but her relationship with Klaus remains fractured.

They became closer as they worked together to protect their daughter and their family. They fought against Lucien together with their family and defeated him, and by the end of the day, while Klaus is imprisoned, Hayley now searches for a way to reunite the family.

Marcel Gerard

 * "I'd have thrown you a damn parade."
 * —Marcel to Klaus
 * Main article: Klaus and Marcel

Marcel is Klaus' ex-best friend and former student. It's complicated, but they respect each other. There's definitely a history between them. It has been stated many times that Klaus loves Marcel like a son. Also, Marcel is very much in favor of embracing his true nature as a vampire and that’s something he learned from Klaus and something they certainly have in common. When Klaus returns to New Orleans after 100 years, he finds that Marcel has taken control of the city. Seeing that his former student has used everything he's taught him and achieved glory, Klaus wants what he has, forming a rivalry between the two. But  Klaus still sees Marcel as his old friend. After Marcel attempted to bury Klaus, he surrendered New Orleans to him and despite their still unresolved differences, Klaus asked Marcel to rule side by side with him. After finding out that Marcel conspired with Rebekah to bring Mikael back in order to get Klaus to run from New Orleans and for him and Rebekah to be together, Marcel was banished from New Orleans. His relationship with Klaus is currently broken as Marcel lives in exile and tries to find a way to get New Orleans back under his rule. After he helped save Klaus' child from being sacrificed, Klaus gave him some blood to cure the werewolf bite and they returned to being allies once more.

By the end of the third season, they have become enemies again, this time for good. As Marcel has put him in agony with Papa Tunde's blade. Even five years after his imprisonment, Klaus still has not forgiven Marcel for his treachery against the Mikaelson family, and mainly because he has missed five years of his daughter, Hope growing up.

Camille O'Connell

 * "Because you wished it. Because what's important to you is important to me. What makes you happy makes me want to keep you so. What scares you I want to tear apart. I do not wish to watch you from behind glass Camille"
 * —Klaus to Camille
 * Main article: Klaus and Camille

Klaus and Camille's relationship together starts slowly. They first meet at Rousseau's, a bar in New Orleans. Later, they bond over a painter's artwork when Camille describes the artwork and the painter. Klaus is impressed by her and Camille is seen to bring out the humanity in Klaus. Klaus seems to have taken an interest in Camille. He first saw her when she was bar-tending, someone she later remembers as being the "$100 guy". However later on, after being given the news about his child, he was more interested in her when she was looking at an artist painting  and she described the story she assumed of the artist. Her words about the man in the painting being "alone", caused him to show his humanity and seemingly change his mind towards the future of his unborn child. He later chose to withheld from her that his child lives, not wanting her to get further involved in the supernatural than she already is. She later found out that his daughter Hope Mikaelson, had survived and she watched over her for him for a short period of time. Camille is Klaus' go to girl when he needs support and she is more than willing to lend an ear and listen to his problems and help him deal with them. They both are shown to care very deeply for each other and have possible feelings for one another. After getting closer to each other gradually, they eventually share their first kiss on Klaus' balcony. However, Cami turned into a vampire due to Aurora's jealousy against Camille.

Caroline Forbes

 * "I know that you’re in love with me. And anybody capable of love is capable of being saved."
 * —Caroline to Klaus

Main article: Klaus and Caroline

Klaus and Caroline's relationship has slowly been coming together ever since he saved her life on her birthday  Klaus later developed an unrequited romantic interest in Caroline and invited her to his family's ball. At the ball, they danced and talked together and she soon discovered a soft side to Klaus. When she returned home that night, she found a hand-drawn picture of her and a horse, from Klaus. As the series progressed, Klaus fell for her even more because in his eyes, she's too smart to be seduced by him, she's beautiful, strong and full of light. Despite the constant attempts of her friends to kill him, with  Caroline's help, who was trying to distract him, Klaus still cares about her. Caroline and Klaus had a date that she accepted in exchange for one of his hybrids to save Elena. They had a fun afternoon where Caroline asks him if he would ever take the cure for become human again, but he evades her question by asking her if she would take the cure. Later, Klaus revealed to Caroline the only time he wanted to be human again, Caroline likes that. When Klaus returned for her graduation, he told Caroline that he intends to be her last love, no matter how long it takes. He believes one day that she will choose him and let him show her the world. After returning to Mystic Falls to see the supposed death of Katherine, Klaus is in the woods with Caroline and he asks her to be honest about her feelings for him and that as soon as they are done with the conversation, he is going to walk away and never come back. Caroline finally accepts that they have a connection and then they share their first kiss which leads up to sex.

Tyler Lockwood

 * Main article: Tyler and Klaus
 * "Which means I can kill your ass, and no one else has to die."
 * —Tyler to Klaus

Tyler was the first successful hybrid of Klaus' bloodline and Klaus' most trusted hybrid. Initially Tyler was very grateful as Klaus had taken the pain of turning on a full moon away. However due to being supernaturally loyal to Klaus. Tyler was forced to do things he did not wish to do, such as when Klaus made Tyler bite Caroline. After losing his friends and his girlfriend, Tyler vowed to break the sirebond so he would no longer hurt his friends, even if that meant breaking every single bone in his body a hundred times. Klaus was unaware that Tyler started a coup d'etat against him by freeing the other hybrids and claiming the title of the Alpha of the Hybrid Pack. However Hayley who had helped Tyler with this task, had told Klaus, which resulted the massacre of the whole pack excluding Tyler. This wasn't enough to satisfy Klaus' anger, therefore he killed Carol Lockwood in a fit of rage. Enraged by this. Tyler swore vengeance against Klaus, and headed out to New Orleans, to avenge his mother and his fallen friends. After a hectic battle, Tyler was shown to be a worthy opponent despite being outmatched, and was eventually defeated by Klaus, who compelled Tyler to leave and know that he meant nothing to him. Tyler and Klaus were arch nemesis' and had the most intense rivalry on the show. The current state of their feud now is unknown, and possibly ended now that the two have gone down very different paths. Klaus being a father, and Tyler being a vampire hunter.

Name

 * Klaus is a German variation of "Nicholas". From the Greek Νικολαος (Nikolaos) meaning "victory of the people". It's the name of a saint who is at the origin of Saint Claus legend. It is also a shortened name of Niklaus. In Ancient Norse: ᚾᛁᚲᛚᚨᚢᛋ ᛗᛁᚲᚨᛖᛚᛋᛟᚾ.
 * Mikaelson is of of Scandinavian origin and means "Son of Mikael"

Trivia

 * There are similarities between Klaus and Kai:
 * They are both different from the rest of their siblings, Klaus was born werewolf then turned hybrid, Kai was born as a witch without magic but has the ability to absorb magic.
 * They both have hurt most of their siblings. Although in Kai's case he killed most of them while Klaus prefers to neutralize his, although he still cares for his family whereas Kai does not.
 * Since Katherine had been turned into a vampire on April 6, 1492,[1] it could be assumed that Klaus' birthday[2] is some time in between January and April.
 * Rebekah assumed that Klaus' reasoning for making hybrids is due to his fear of being alone.
 * Klaus said "I will kill you and every one you've ever met" to Stefan. This is what he said to Katherine before murdering her family.
 * Klaus is a Beatles fan, claiming that they made the 60's bearable
 * Klaus suffered the Hunter's Curse for 52 years, 4 months and 9 days. When he neutralized Rebekah in 1835, he left her daggered for 52 years.
 * Klaus has been daggered a number of times, but due to his Werewolf side, he was unaffected by the silver White Oak Ash Daggers. He has only been neutralized once with the gold White Oak Ash Dagger Kol created specifically for Klaus.
 * Klaus only feeds his blood directly from the wrist to females, for males he drips his blood into a container. He made an exception when he sired Marcel and let him drink from his wrist before killing him.
 * Klaus can read and speak Aramaic. He can also speak French, German, and Italian - although to what extent is unknown.
 * Klaus has a "birds of a feather" tattoo on the front of his left shoulder, eight bird tattoos on the left side of his chest and has a triangle tattoo on the right side of his back.
 * Finn states that he expected cruelty from Klaus when discussing how he was left daggered for nine hundred years, this indicates that Klaus became cruel and vicious within only a hundred years of being a vampire. This process started when Klaus sired Lucien as they both enjoyed feeding and killing humans.