User blog comment:Martialmaniac/Alluka gender poll (not binding)/@comment-5780397-20160402130157

1-  In Chapter 338 (Japanese), both Alluka and Nanika have been addressed as "she" by Killua. A few pages later, Killua, referring to Alluka, said "She is a good sister". Alluka has showed no signs of discomfort on either occasion despite being within hearing range. Since this is also the last time she is mentioned, I believe Alluka is indeed a trans female and should be referred to as such.