Hiya! Gosh, hehe, thank you so much! <3
I don’t think I personally have a preferred gender or anything set for Bonnie (or even BonBon). Granted, I don’t see Bonnie as agender, but more so… ‘genderfluid’, I believe is the correct term? I could see them as more male at times, more female, anywhere in between, could be any other gender, or I just don’t take it into consideration. My personal view on it tends to flip-flop like that, but I don’t have a set gender.
This why I choose to keep Bonnie androgynous! It’s simpler to me, especially since many others may prefer a certain set pronoun when referring to a character. (If referring to other peoples’ Bonnies, though, and they have set genders for them, I do tend to refer to them as such!) :)