Niklaus Mikaelson

He is someone very strong, powerful, narcissistic, manipulative and heartlessly bad but at the same time he is compassionate, sensitive, lovable, and extremely emotional. Klaus is highly intelligent, calculating, thinks of contingencies,. He is exceptionally intelligent and strategic. He is known for his sharp mind, quick wit, and ability to outsmart his adversaries. His intelligence helps him navigate the dangerous and unpredictable world

While he was still an untriggered Werewolf-Witch hybrid, Klaus had a complicated life. He was close with his half-sister Rebekah, whom he affectionately called "Bekah", and with his half-brothers Elijah and Henrik. He also had a close relationship with his half-brother, Kol, but he did not get along at all with his half-brother, Finn, since childhood. However, he had a bad relationship with his overbearing step-father Mikael who was harder on him than any of his siblings. He was a victim of his stepfather's physical and verbal abuse since childhood. Klaus even admitted to Rebekah that Mikael frightened him which made him constantly seek his approval without ever finding it. His mother Esther often tried to calm Mikael when he became angry with Klaus, but she never tried to stop him from humiliating or from physically/mentally abusing her son. Also as an untriggered werewolf, Klaus had the aggressive behavior of one, but he could not act on it due to his mother making him wear a magical necklace, created to weaken his strength and thus leaving him vulnerable to Mikael's abuse. These following reasons led him to resent both his parents and possibly to be jealous of his maternal half-siblings for having their approval. .