I know it’s different for everyone for whatever circumstance, but I would think that Freddy and Foxy are males, while Chica is (of course) female.

And while this may be a ‘debate’ for most, I actually can’t determine what I would ‘prefer’ Bonnie to be. I see that character as androgynous overall. While I initially assumed Bonnie was a girl (and probably would use female pronouns to describe ‘em on most occasions), I can also see Bonnie as a male. But I tend to switch back and forth just ‘cause.

If I had to specifically say a gender, I suppose a very tomboyish female (mainly ‘cause of appearance). But I’d say it’s left up to everyone’s interpretation/preference, considering there’s no confirmation of Bonnie’s gender from the creator (as far as I know)! :)