Board Thread:Questions and Answers/@comment-25951143-20150101110046/@comment-5780397-20160619234440

As you said, Nanika is not to be considered in the way Alluka sees herself. Nanika was recently confirmed to be a different being originating in the Dark Continent. She is a female gendered being (she calls herself a girl), and not a personality.

What I meant in my previous comment is that Killua unmistikably told Gotoh that Alluka needed female butlers because she is a girl, and that he introduced Alluka (NOT Nanika, he introduced them separately) to Gon as his sister, and Alluka did not mind at all. Since this implies Alluka sees herself as a girl, and the guidelines suggest we use the gender of a character and not their sex, I think we should say Alluka is a trans girl (her body is definitely male).