All About Klaus :)

"Niklaus is the name my father gave me. Please, call me Klaus  ”

— Klaus

Niklaus Mikaelson, more commonly known as "Nik" or "Klaus" is an Original/Hybrid, the son of an Unnamed Man and Esther and the main antagonist of the series. He has six siblings that consists of five brothers and one sister. A deceased unnamed older brother, four other brothers named Elijah, Finn, Kol, and Henrik. And a younger sister named Rebekah. Klaus is also the Step-Son of Mikael.

He is first mentioned in a conversation between Rose and Stefan warning him about the Originals. Klaus is believed to be the most hated and feared of all the Originals and those who fear him are desperate for his approval. Over the centuries Klaus has become a recluse who confides in and trusts only the members of his inner circle.

For over 1000 years Klaus has been trying to a break a curse that bound him to a moonstone. He created the myth of the sun and moon curse in order to help find the moonstone and the Petrova Doppelgänger that was needed to break the actual curse. His goal was to bring out his werewolf side so he could sire his own super race.

In 1492, he finally got his chance to break his curse when he met Katerina Petrova, the final piece for the ritual. He kept her entertained until the full moon, but was unaware that she found out what he was and what he wanted from her, causing Katherine to escape from him. After Katerina turned into a vampire he assumed that her family line ended with her and that his chance to break his curse was forever gone; Klaus traveled to Bulgaria and slaughtered her entire family in revenge.

For the next 500 years Klaus was searching for a way to break the curse without the doppelgänger and had forced generations of witches and warlocks to help him for centuries. Along his search for a way to break his curse, Klaus has hunted down his family and neutralized them. Also he was searching for Katerina Petrova, who escaped him and stole his moonstone.

Klaus is a member of the Mikaelson Family.

History

Niklaus during the middle ages

Klaus was born to Esther and a unknown man, in a small village that would eventually become known as Mystic Falls. Klaus has six half-siblings and a step-father named Mikael, who was a wealthy landowner who moved with Esther to the New World when their home village was devastated by a plague. Klaus was close to his family with the exception of Mikael; this was because Klaus was not his son and from a different bloodline. Many years before his mother had an affair with a man from a different species. When his brother Henrik was killed by a werewolf, Esther performed a ritual which transformed Klaus, his siblings and his step father into 

Esther and Niklaus looks at Henrik's body

vampires. When he made his first human kill, his werewolf gene was activated, thus informing Mikael of Esther's unfaithfulness. Mikael then hunted down and killed Klaus' father and his entire family, not realizing that he was igniting a war between vampires and werewolves that has been perpetuated across the ages. Soon after becoming a vampire and discovering his werewolf bloodline, a curse was placed on Klaus by Esther, forcing his werewolf side to lie dormant and then abandoned him. In retaliation, Klaus murdered his mother, and framed Mikael for the act.

1492

Klaus meets Katerina Petrova.

He was a nobleman in the late 15th century England where he met Katerina Petrova

Klaus in 1492.

. He planned to sacrifice her, but she escaped. After Katherine escaped, she was turned into a vampire unintentionally by Rose.

In retaliation, Klaus traveled to Bulgaria and murdered her family for her defiance. Over the centuries Klaus was obsessed with finding Katherine, to break his curse without the doppelgänger and his moonstone ever since.

1920s

During the 1920s Klaus and his sister Rebekah were on the run from the vampire Mikael, a vampire hunter from his past. The siblings were in Chicago in 1922 where they met the vampire Stefan Salvatore who Rebekah fell in love with. At first Klaus hated Stefan but it changed when Klaus discovers that Stefan was a Ripper and they became good friends. One day they were attacked at a bar by Mikael. Before Klaus and Rebekah left, Klaus compelled Stefan to forget him and Rebekah. Later when he and Rebekah were about to leave Chicago, Rebekah told Klaus that she was tired of running and wanted to be with Stefan. Klaus then forced her to choose between him and Stefan, she chose Stefan. This made so him angry that he neutralized his sister with a White Oak Ash Dagger, he then took her body with him in a car and left Chicago.

Season Two

Klaus in Alaric's body

Isobel Flemming, a vampire working for Katerina Petrova who now went by the name Katherine Pierce, who also happened to be the mother of the second Petrova doppelgänger (Elena Gilbert), was trying to find Klaus and ultimately succeeded by getting close to a member of his inner circle. Klaus found out what she was up to and compelled her to tell him what she knew. When he learned that she was working for Katherine and that the rumors about a doppelganger in Mystic Falls were true, he decided to use her in a plan to capture Katherine and the Moonstone. Along with Klaus's trusted warlock, Maddox, Isobel made Katherine believe that Klaus was willing to pardon her if she delivered the Moonstone and the doppelganger to him. While Katherine found the Moonstone, Isobel helped Maddox capture her former husband, Alaric Saltzman. Katherine and Isobel then captured Elena at which point Isobel revealed her true colors and Maddox captured Katherine. He then ordered her to let Elena go since Klaus didn't need her yet. Maddox then transferred Klaus's spirit into Alaric's body so that he could spy on Elena and her friends.

In the Last Dance, Klaus interrogated Katherine for information about Elena and her friends and learned that a witch Bonnie Bennett could be a danger to him so he decided to kill her. Still pretending to be Alaric he attacked her at the 60's decade dance by compelling several students. Finally cornering Bonnie, he forced her to use all her power and die. He didn't realize that she had faked her death to protect herself and Elena.

In Klaus, he has Maddox, and his other minions, including Greta, bring his original body to him so that he can return to it. While they are doing so, he sets up a contingency plan by threatening Jenna's life. As Stefan stops him from killing Jenna, Klaus tells him that it would be easy for him to take his revenge if Elena tries to stop him from breaking the curse. At the same time, Elena learns from Elijah the real nature of the curse and why Klaus wanted to break it. He was then released from Alaric's body and returned to his own by Maddox and Greta.

Klaus back in his own body

Klaus goes to the Mystic Grill to remind Damon not to do anything he will regret. Damon asks if he can postpone the ritual, but Klaus says he has everything and the ritual will happen. He warns him not to screw it up if he wants to live. Klaus returns to Alaric's apartment and is immediately suspicious of Katherine. He compels her to tell him what she has been doing but, as she is taking vervain, she is able to lie. He is still suspicious and 'compels' her to take off her bracelet, walk to the window and stand in the sunlight. Katherine has to do it and screams. Eventually Klaus believes she is compelled and says she needs to do something for him. When the full moon begins to emerge Stefan and Elena arrive home but are confronted by Klaus, who tells Stefan that he had him all nervous and thought he had done something stupid. Klaus asks if Elena is ready. Stefan put his arm in front of Elena and says "No". Klaus tells him there is no reason for him to die, and he and Elena leave for the ritual.

Klaus returns to Alaric's apartment and tells Katherine that Elena is with Greta. The door flings open and Damon tells Klaus to postpone the ritual, explaining that he rescued the werewolf and vampire and killed Maddox. Klaus tells him that he knew either Damon or Stefan would try to stop him and reveals that he always has a back-up plan. He shows Damon on a webcam that he has captured Jules. Damon asks if he has a back-up vampire and Klaus says he has got it covered, before darkness falls on Damon. Katherine wakes Damon up and tells him that Klaus has gone to begin the ritual. She admits that she had to do something so Klaus wouldn't realize she was on vervain, and reveals that Klaus made her call Jenna, to lure her out explaining that he needed another vampire because Damon's blood was impure due to his werewolf bite.

Klaus reveals to Damon that he always has a back-up plan

Klaus appears at the quarry and begins the sacrifice by handing the moonstone over to Greta. Klaus walks over to Jules, who then tries to attack him but fails. Klaus rips out her heart then squeezes the blood into the spell. The sacrifice continues and Elena begs Klaus to let Jenna go, explaining that she doesn't have to die. Elena doesn't want to leave Jeremy without a family and points out that she did everything Klaus asked. However, Klaus realizes that Stefan has arrived and goes to speak to him on top of a cliff, who wants to replace Jenna in the sacrifice.

Klaus and Stefan return to the women and Klaus asks Elena who she wants to save and who she wants to die. However, he soon reveals that she doesn't really have a choice and stakes Stefan in the back. He explains that he has other plans for Stefan and needs him alive. Greta removes the fire from Jenna and Elena starts crying, Jenna then rushes over to bite Greta. However, Klaus stabs her, lies her down and stakes Jenna in the heart.

Klaus kills Elena and breaks his curse

Klaus appears and tells Elena it's time, offering her his hand. She refuses it and walks past him to the sacrificial altar. Klaus thanks her, but she tells him to go to hell. He bites her neck and feeds from her until she falls onto the ground, lifeless. Klaus announces that he can "feel it happening" and begins to transform. Bonnie appears and throws him across the ground. Greta heads over towards them, but Damon breaks her neck.

Bonnie continues to cast the spell with Klaus yelling to the top of his lungs in pain. As he is about to.die, Elijah approaches him at which point Bonnie stops the spell. Klaus seems terrified as he sees his brother towering over him. Elijah punches through Klaus's rib cage to get to his heart as he asks him to say the names of their family. Klaus then tells him that he didn't bury them at sea and that their bodies were safe and that Elijah would never find them without him. After some consideration, Elijah saves his brother without Stefan or Bonnie being able to stop him.

Klaus transforming into a true hybrid

A few days later wakes he up in the forest with Elijah over him. Elijah gave him some clothes and asked him where are the bodies of their family. Klaus says that he will take him to them in time. Later they go to Alaric's apartment where they find Katherine and Stefan. Stefan is there for a cure for Damon's Werewolf bite. Klaus suddenly stakes Elijah with the white oak ash dagger, and then he runs towards Stefan and puts a wooden stake close to his heart. Stefan then tries to make a deal with him. Klaus will give him a cure for a Werewolf bite and he will be at his mercy. He releases

Klaus bites Katherine.

Stefan and then he bites Katherine and gives her his blood and tells Stefan that his blood is the cure, and in exchange he forces Stefan to drink human blood several times. In the end he tells Katherine to go and give Damon his blood. Later he and Stefan go to a warehouse where he puts Elijah's body in a coffin and tells some men to put him with the others, then he tells Stefan that they will leave town after Stefan does something for him. Then a girl comes and Klaus bites her and tells her to run and then Stefan blocks her path and kills her much to Klaus' approval, after that Klaus and Stefan leave town.

Season Three

Klaus has been tracking down a werewolf named Ray Sutton and tracks him through the whole Eastern seaboard le

Klaus and Stefan finds Ray

aving a trail of bodies behind which are caused by Stefan. He ultimately finds him in Tennessee where he has Stefan kill two more girls before they corner Ray in a bar. There, Klaus tells Ray that he is a Hybrid and that he wants to create more. He has Stefan torture Ray using darts tipped in wolfsbane to force Ray to reveal the location of his pack. At this time, Klaus is warned that Damon Salvatore had gone to the house where they had killed two women. He decides to go and put Damon in his place but Stefan insists that he should go in his place. Klaus lets him. He ends up getting the location of the pack from Ray, then he finds the location of Ray's pack and ends up feeding Sutton his blood before killing him so as to turn him into a Hybrid.

In The Hybrid, Klaus and Stefan find Ray's werewolf pack in the woods. Klaus turned them all into Hybrids. When Ray bleeds through his eyes and feels pain, Klaus then discovered that there something wrong with the hybrids. Then Ray soon became rabid and fled the site. Stefan tried to stop him and was bitten. Klaus was only willing to give Stefan the cure to the fatal bite if he retrieved Ray. When the same thing happened with the other hybrids he killed some, and some died on their own When Stefan came back with Ray's dead body Klaus was angry over that he could not make Hybrids. Klaus gave Stefan his blood and left the camp with Stefan leaving the hybrids dead body's on the ground.

Klaus and Stefan in the 1920s

At the beginning of The End of the Affair, Klaus and Stefan are shown to have arrived in Chicago, where Klaus plans to meet "his favorite witch", Gloria, to find out why he can't make any new Hybrids. Stefan finds a picture of them together at the bar, and Klaus reveals they knew each other, that they had been friends back in the 1920s and that Klaus was Stefan's "number one fan", as he liked Stefan's way of making others suffer before killing them. He had erased his memories to protect themselves, as they were running from a yet unknown person. Gloria tells them that she needs Rebekah, as she has something Gloria needs. Klaus resurrects his sister, but she does not have her necklace, which can be used to contact the Original Witch.

In Disturbing Behavior, Klaus is still using Gloria to try and find the necklace used in contacting the Original Witch. Klaus later finds out that Stefan was asking about Mikael, the person that he was maybe running from in the 1920s. Klaus seems angered by this and knocks Stefan out then takes him back to Mystic falls to find out why he is still holding on to his former life.

At the beginning of The Reckoning, Klaus corners Elena, asking her why she is still alive. He takes her by the arm and leads her to the gym, chasing away the other students by telling them they're busted for pranking. Elena tells Klaus not to hurt anyone, but he argues that he has to. Rebekah drags Tyler's body into the gym, and they wait till Bonnie arrives, where Klaus tells her she has to find a way that he can successfully create hybrids.

Klaus and Elena watching as Dana holds her leg up

Stefan later comes in and pledges allegiance to Klaus, but both knew it was a lie as soon as Klaus hurt Elena, and Stefan tried to stop him. Klaus then compelled Stefan not to fight him and to listen to him. He ordered him to kill the two teenagers, Dana and Chad, who Klaus had compelled to stay there. To make a game of everything, Klaus puts a clock on it: Bonnie has to find a way for him to create hybrids, or else Stefan must kill Elena. 

Klaus telling Stefan to turn off his humanity

After Stefan tried to fight the compulsion, Klaus yet again compelled him, this time with a stronger force to turn his humanity off, finally getting Stefan to obey. Presumably, Stefan attacked Elena, but somehow Klaus must have stopped him, as he figured out himself how to create a Hybrid: with the doppelganger blood. He fed Tyler the blood, and Tyler then changed into a Hybrid.

Klaus and Rebekah after he found the solution to his hybrid problem

In the parking lot of the hospital, Damon comes to rescue Elena, but Klaus stops him, saying he could kill him now that his brother doesn't care. Damon tells him that Mikael knows where they are. Klaus replies that he's bluffing, but Damon informs him that they found Mikael's tomb. Klaus threw Damon against a car and vanished without a trace.

Klaus leaves town in search of werewolves he can turn into hybrids. He manages to find several, successfully turning them into hybrids.

Klaus cries when Mikael taunts him.

In Homecoming, Klaus receives a call from Stefan who tells him that Mikael is dead. Thanks to the fact that Elena really did stab Mikael with a white oak dagger, Stefan is able to override Klaus's compulsion when he is forced to tell the truth. Rebekah, who has learned that Klaus had killed her mother, confirmed what they had said in an attempt to lure him back to Mystic Falls. Klaus says that he will be on his way. Klaus has Tyler throw a party to celebrate Mikael's death. After seeing who he thinks is Elena, he reveals that his hybrids are present, and they have orders to kill Damon if Klaus is killed. The party goes well, until one of his hybrids say that a guest named Mikael is waiting for him. Visibly angered, he goes to meet his step-father.

Klaus attempts to have his hybrids attack Mikael, but Mikael reveals that while they are sired to Klaus, they are part vampire and can therefore be compelled by Mikael. Mikael reveals that he had one of the hybrids grab 'Elena' and threatened to kill her if Klaus didn't come outside of the Lockwood house.

"I will kill you and everyone you've ever met"

Klaus tries to call Mikael's bluff, but Mikael stabs her. To everyone's shock, it wasn't Elena at all, but Katherine, who throws wolfsbane grenades at the hybrids and runs.

Damon then appears and attacks Klaus with the white oak stake. However, Stefan interrupts the battle, pulling Damon off of Klaus. Klaus grabs the stake and drives it through Mikael's heart, killing him and seemingly destroying the stake. When Damon asks Stefan what he was doing, it is Klaus who answers by saying that Stefan was earning his freedom, he then gives Stefan his freedom. Klaus then left. Unaware of his sister's role in the murder attempt, he tries to call her saying that is time to go, but is unable to reach her (do to Elena daggering her). Stefan then calls and reveals that he stole the coffins with Klaus' siblings, who Klaus intended to revive now that Mikael was dead. Klaus threatens to kill Stefan and anyone Stefan ever met, but Stefan merely replies that if he does, he will never see his family again.

Klaus re-daggering Rebekah

In The New Deal he builds himself and his hybrids a house to stay at Mystic Falls. He meets Damon and Elena at the Grill wants to know where Rebekah is. He leaves, saying to Elena she should find Stefan. He calls Jeremy and tells him to go outside on the street and not to move. He intended to kill Jeremy by a car accident. To save Jeremy's life, Elena made a deal with Klaus. She shows him where Rebekah was and he spares Jeremy's life. He leaves with Rebekah, after Elena told him that she knows he killed Esther. Back home Rebekah slowly recovers but Klaus stabs her again with the White Oak Ash Dagger, killing her.

In Our Town Stefan visits Klaus and tells him to get his hybrids out of the town. When he doesn't agree, Stefan kills Mindy by decapitating her. Klaus is angry and tells Tyler to bite Caroline but he refuses. Later, Klaus attended the Founder's Council Feast and tries to convince the Mayor that his hybrids would protect the town, successfully. After Damon received a phone call from Stefan that he has Elena and is trying to turn her into a vampire, he goes to talk to Klaus. Klaus thinks Stefan bluffs but calls Stefan. Hearing that Stefan has Elena fed his blood, he promises to get his hybrids out of Mystic Falls. After Tyler accidentally bit Caroline he went to Klaus asking him for help. Klaus goes to the Forbes place to heal Caroline. Liz invites him in and he has a intimate conversation with Caroline about being a vampire. Eventually, he feeds Caroline his bloods and says "Happy Birthday". After Caroline woke up, Klaus has left but she finds an expensive bracelet made of dozens of diamonds. A gift from Klaus.

In The Ties That Bind Klaus is seen in one of Bonnie's dreams as she tried to open the locked coffin. Back in present time Stefan went to Klaus and talks to him. Klaus states that he wants his family back, now that his Hybrids left town. It is revealed that he ordered Daniel Warren to the house of Abby Bennett as he called him later. When Damon went to the Abandoned Cottage, Klaus came and gets tortured by the spirits of the dead witches. As he threatens to kill all witches they stop hurting him. He then commands them to show him the coffins and they do. Just the fourth one is missing. He asked Damon where the last one is and he threatens to rip out his heart but he doesn't get an answer. After all coffins were moved to his house, Klaus had to go to finish some business but is surprised by Elijah, un-daggered earlier by Damon, standing in front of him after he killed a hybrid.

in Bringing Out The Dead Klaus and Elijah are having a fight and Klaus pulls the dagger out of Kol, threatening Elijah to stab him again. He says that he will have to deal with Kol if he kills him, so Niklaus instead says that he killed Mikael with his own weapon. Elijah asks why their family has to stay in coffins; Finn for over 900 years, Kol for over a century and Klaus answers because Stefan has stolen a fourth coffin. He then daggers Kol again and makes a deal with Elijah. When he's helping him destroying Stefan, he will awaken the family. So Klaus throws a dinner party and Stefan and Damon are invited. Klaus reveals his and Elijah's past with Tatia, the Original Petrova girl, stating that they both loved her. Klaus then hints that Elena would be better when she grew old with Matt, giving birth to a child so that every hundred years there would be a new doppelganger. Stefan doesn't accept this deal and so Klaus overpowers him and stretches his arm into the flames, burning him.

As Damon and Elijah are away, Klaus notices that Stefan really has given up and asks him where the Ripper is. Elijah comes back, along him two Daggers. Elijah says that he doesn't trust Klaus' promises and Kol appears. Klaus holds up his hands but when Kol wanted to attack, Finn rushes over to Klaus, stabbing 

Klaus cries as Esther "forgives" him.

one dagger into Klaus hand. Turning around and trying to escape, Rebekah appears in front of him, stabbing him in the stomach, taking her anger out on her brother for killing her mother. Kol then holds him as he stumbles back. Klaus tries to apologize but Rebekah states that they will leave him after killing Elena. Enraged Klaus threatens to hunt them down again. Elijah mentions that he then would be like Mikael. Now furious Klaus screams that he doesn't have to fear anything from his siblings because he can't be killed. Suddenly, Esther arrives at the house. She wants Niklaus to look and him and asks if he knows why she was here. Klaus states that she would kill him right now but instead she forgives him and wants - now speaking to her children - to be a family again. After hearing that Rebekah went after the doppelgänger, Klaus heads on home, confronting his sister. He threatens to put another dagger in her heart but Kol intervenes, mocking about the threat of these daggers. Esther arrives and wants to talk alone to him. She says that she's here so that this family could live in peace again and asks her son who he is going to bring to the ball, stating it's going to be a magical evening. So Klaus sent an invitation and a ball dress as a present to Caroline with a note to dance with him. She appears wearing the dress and the bracelet he left in her room on her birthday. She later dances the waltz with him, asking her 

Klaus and Caroline at the dance.

how she is after Bill died. He makes compliments about her dancing skills which she commented with having had some training. They are later seen outside, standing next to a horse. Klaus states that he had a horse but it got killed by Mikael. He also stated that the relationship with his father was really complex as Caroline's was with Bill. She then mentions that she let her dad with no regret and goes back to the party. They then go inside the house where Klaus reveals that he likes drawing, having drawn many people and also a landscape which is now hanging in the house. He asks if she has been somewhere and that he could take anywhere she wants. Caroline then says it must be good if he gets everything he wants. She thinks that's the reason he creates hybrids and wants him to give Tyler his life back. Klaus then asked her to leave. However, she also states that he compels people, he sires hybrids or buys affections to make friends and she is not the girl he can buy off. Angered, she leaves Klaus alone. 

Klaus and his brothers confronting Esther and Finn.

The next day he is with Kol in the house. Rebekah comes home from her one night stand while Klaus is drawing pictures (presumably of Caroline). Kol states he's bored so he and Nik go outside. They head to the Grill where they meet Alaric and Meredith Fell. As a distraction, planned by Damon, Caroline enters the pub but isn't pleased to see Klaus. He follows her outside, wanting to talk about her. She sits down and talks with him. After Kol got neutralized, Klaus feels something and immediately recognizes something must have happened, getting angry at Caroline because he suspected her. He rushes to Kol, pulls the dagger out and threatens to kill the Salvatores, but is stopped by Elijah. Together with Kol and Elijah he goes to the Witch Burial Ground. He orders her to end this and he'll send her back to hell. She responds she hated it to see how he shed blood. After she left with Finn, Klaus is seen burning the pictures he draw of Caroline. Rebekah enters, stating she hated him as she found out that he killed Esther, but Klaus is the only one who has never left her. She then delivers shocking news. Klaus learns that sapling of the White Oak Tree has been planted 300 years after they left the Old World.