Illumi Zoldyck

Illumi Zoldyck is the eldest child of Silva and Kikyo Zoldyck. During the 287th Hunter Examination, he appeared under the guise of Gittarackur . Illumi currently seems to be the only person that Hisoka claims as friend, although their relationship is unconventional. Illumi appears expressionless, his face like an emotionless mask. He has very long jet black hair, usually combed behind his head as well as, very large, dark eyes. To disguise himself as Gittarackur, Illumi uses large round head pins to reconstruct his facial structure, and even voice, beyond recognition. The pins in his chest seem to affect the muscles in his body, as he looks more slender without them. When he was younger, Illumi's hair only reached his shoulders. He wore long sleeves with a shirt underneath, as well as grey pants.

Illumi, for the most part, displays very little expression. In contrast to his expressionless demeanor, Illumi often speaks in a somewhat joyful and absent-minded tone. He is generally a stony, ruthless person with an extremely cold way of thinking, reflects only his interest. Still, he holds a twisted and overprotective form of love for his younger brother, Killua; this manifests to the point that he used his Nen ability to control Killua and ensure he survives and obeys. He and his father raised Killua to believe that the only thing sustaining him was darkness, and that he could only obtain joy in causing the death of others. To ensure that Killua would live to carry on the family business, and as a means of protecting his little brother, Illumi implanted a needle in Killua's brain, forcing the latter to run from battles he wasn't sure he could win. He also has an unusual friendship with Hisoka, although it is unclear as to how it developed. Illumi once came to the aid of Hisoka by standing for him as a double in the Phantom Troupe's hideout while Hisoka attempted to find Chrollo. However, when Hisoka asked Illumi would it be okay if he killed Killua, Illumi displayed a horrifying side of himself and asked if Hisoka wanted to die then and there - he acted very similar to how Hisoka did himself after Illumi was opting whether or not to kill Gon, whom he sees as a threat due to his closeness with Killua, during the Hunter Exam, albeit on a much lesser expense. Illumi cares for most of the Zoldyck family members. He is willing to handle Alluka's power, even if it costs him his life. He has stated, however, that family members are not allowed to kill during an inner mission (a mission where there is internal conflict), but insinuates that he would be fine with killing Alluka and does not consider Alluka a member of the family. Tsubone implies that Illumi's sinister ambition to control Alluka's power even caused him to stray from the path of an assassin.

Illumi is the eldest son of Silva and Kikyo, and was raised from birth in the art of assassination. He and his father trained Killua to become an assassin. At some point in the past, he learned Nen and, in order to control the development and actions of his younger brother, he inserted a needle into Killua's brain, forcing him to run away from the battles he wasn't sure he could win. Sometime prior to the 287th Hunter Exam, he established some sort of relationship with Hisoka. When Killua ran away, Illumi was sent by his mother to watch over his brother. lumi is briefly seen during the first parts of the Hunter Exam, under the name of Gittarackur and with his appearance highly distorted by his pins. He makes his first appearance when Tonpa considers offering him his laxative-laced juice. When Hisoka lags behind to play judge, Illumi helps him find his way to the second stage with a walkie-talkie and a transponder. He almost fails the second phase due to Menchi's temper. He is amongst the examinees who pass the third phase. Before the fourth phase on Zevil Island, the examiner Lippo gives each of the 25 remaining candidates a card with a number on it; the fourth stage of the exam is conducted as a manhunt and Lippo warns the candidates that their own badges would be on the line due to every candidate being given the number of another's badge. Gittarackur phones Hisoka and offers his help, but Hisoka turns down the offer. He later finds his target, Gozu, but is interrupted by Siper, who has Gittarackur as her target and attempts to kill him by sniping at him from a distance. However, she hits Gozu, who is fatally injured. Gittarackur then kills Siper. Later, he goes to Hisoka and gives him the number badge belonging to Siper. He then digs a hole and sleeps in it with the two badges until the end of the fourth phase. The final phase is an elimination tournament where the winners are removed from the tournament and the losers given more chances; winning a match results in the victor receiving his or her Hunter License. Killua is required to fight Gittarackur as his second match after feeling sorry for his first opponent and letting him win. When the match begins, Illumi reveals himself to his little brother. He mentions that his reason for taking the exam was not only to obtain a license, which he needed for an assassination mission, but also to watch over Killua because of their mother's worries about Killua going off on his own. Illumi then tells his brother that he will never make a good Hunter because he cannot break free of his training as an assassin. He says that Killua's only purpose in life is in killing others, and that he is only a puppet and wants nothing. Having severely disoriented him, he asks what it is that Killua expects from becoming a Hunter.