Not to be silly, but technically the puffball isn't male if he doesn't got the junk. And we can see he doesn't. "He" is a pronoun that is often used and abused. Obviously game creator wouldn't want to say, "Oh my character Kirby? He sexless" as that would cut a swath out of the fanbase. The point I'm trying to make here is: nothing proves Kirby's sex, he's a ****ing BALL! Sure you have screenshots of people calling Kirby by male pronouns. You can call him/her/it whatever you want but the simple fact remains that Kirby is a pink ball who's gender is never addressed by the games and not apparent to the eye. Ironically same goes for MK, because if you've played the games you know that MK is a blue Kirby-thing.