illumi Zoldyck

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 and reflects only on his interests. 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. 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 extent. 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. While Illumi seems devoid of many human emotions, he is not without a sense of desire as he greatly hankers Alluka's Wish Granting ability. Tsubone implies that Illumi's sinister ambition to control Alluka's power even caused him to stray from the path of an assassin.

Illumi arrives and tells Killua to hand over Alluka. Just then, Tsubone also arrives, revealing that she is the "peeping Tom". She states that Milluki cooperates with Illumi by sending a video. The Zoldycks may be watching everything through the video feed from her scope. It is an order from Kikyo Zoldyck that she never remove her scope. Suddenly, Alluka requests for Tsubone's nail from her middle and ring finger, activating her wish-granting mode. Tsubone prompts Killua to make his wish; concurrently Illumi announces that Killua may sacrifice dozens of innocent people to save Gon. Illumi states that killing within the family is prohibited, and he is willing to die in order to ensure the whole family's safety. Instead of wishing for Illumi's death, Killua wishes to heal Tsubone's left hand. After this, Illumi tells him that he is assured that there is a way to heal Gon without putting Killua at risk, but he still believes Killua is hiding information. Later, Illumi watches from afar and wondering about what would happen if he would be able to control Alluka's ability. He requests Tsubone to watch while Nanika heals Gon. Illumi feels a huge force, along with the other Hunters, and laughs to himself, saying that he will have and control "it". He approaches the hospital, stalking Killua and Alluka again. Upon reaching the hospital room, he analyzes the rules of Alluka's abilities. When he arrives, he assures Killua that when he [Illumi] manages how to control Alluka properly, he will guarantee minimum freedom for Alluka instead of being locked in a room all the time. Killua refuses and tells Illumi that he will be the one to protect her. Illumi becomes impatient and demands that Killua hand her over. Killua wakes up Nanika and wishes for Illumi to go home. He is immediately teleported back to the Zoldyck mansion, much to the amazement of the entire family. This event makes Illumi crave to control Killua in order to control Alluka's ability as well while all his family members give up their effort and letting Killua and Alluka go.