unironically asking for a friend, please boost
@Stevarow i can recommend a fanfic https://archiveofourown.org/works/7149080
my take is that if gender truly means nothing to your friend, they are agender, not genderfluid, but in practice the former often is a survival technique masking something much more complicated
the fundamental question is whether gender means nothing to you because you don't have a gender, or because you are too dissociated from your sense of self/identity to say what it is. in the former case there's no action required; the latter case might call for radical change