#nonbinary gender terms

Okay so apparently I didn't make a post about it (or at least I didn't put it in my nbgt tag), but I had added "nullfriend" and maybe "voidfriend" (can't remember) as possible terms for an agent SO. Playing of the idea that agender is like having a null or void gender. Laying in bed here spacing and thinking that I should look into this cassgender(?) I've heard of recently to add to the list, and I suddenly got another idea for agents that I think I love best so far: Zilfriend. 'Zil' from 'zilch', which is of course another word for null. Same principle, better word, amazing result imho. What do you guys think?