Kalluto: Big brother, Killua says I'm a girl because I don't have a penis.
Illumi: He's right.
Kalluto: But I don't want to be a girl. Big brother, can I have your penis?
Illumi: ...No.
Kalluto: Stingy! I'll go ask Dad for one!
Illumi: ...
I've come down with a case of laziness, and I'm now too lazy to even create an original female protagonist, so I'll borrow a character from the source material instead.
There aren't many women in the original Hunter x Hunter, and Kalluto happens to be delicate enough to play either gender... So it'll be him/her _(:3"∠)_