I've just come across the concept of xenogender, which is apparently is an umbrella term for non-binary gender identities that cannot be fully described through their relation to concepts typically used to describe gender such as male, female, etc.
Is this for real or are people having a laugh here? It seems there's a xenogender for almost anything! Cakegender's my personal favourite.
www.lgbtqia.wiki/wiki/Cakegender