Illumi Zoldyck

Personality:   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 solely on his own 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 in order to ensure his survival and obedience. 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. 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 an 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. At some point, Illumi formed an unusual relationship with Hisoka, which he described as "give-and-take". He once came to the aid of the magician by standing for him as a double in the Phantom Troupe's hideout while Hisoka attempted to find Chrollo. However, when Hisoka asks Illumi if it would be okay if he killed Killua, Illumi displays a horrifying side of himself and asks if Hisoka wants to die then and there. His demeanor and bloodlust were very similar to how Hisoka reacted to Illumi's indecision on 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. Despite the mutual benefit of their relationship, Illumi always believed one of them would wind up killing the other. He, therefore, accepted to form a contract with Hisoka with the condition that if the magician is killed, Illumi will receive his reward. The assassin cryptically refers to it as an "engagement ring" and "prenuptial agreement". Illumi casually commits mass murder every time he uses his abilities, sacrificing the lives of innocent people the vast majority of the time. He also joined the Phantom Troupe, an organization notorious for committing genocide, however, he doesn't appear loyal to them when he discloses that all the Spiders were on the Black Whale to Zodiac member, Mizaistom.

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