Board Thread:Questions and Answers/@comment-26005711-20151226104253/@comment-5780397-20151227164713

Hard to say. Illumi seems to be somewhat afraid of Hisoka. However, when Hisoka "threatened" Killua, Illumi was sure he could kill him easily. I still can't think of a reason why Hisoka has not started a fight to the death with him. For the moment, I'll go with Hisoka, but something keeps telling me it's really Illumi.