Right off the bat of the original 10 series in Smash 64 I don't think any of them would involve pizza besides a few. Earthbound has a good chance, giving Ness and Lucas a position. Then again I don't really remember any pizza in the games personally. That said, Mario and Luigi might have eaten pizza in some show but I don't think that would be considered canon and usually it's just spaghetti they're shown eating in Western adaptations. Also Diddy Kong was kinda portrayed as a hip 90s kid with a boombox in DKC2 so he gets a slight shoutout. The highest likelihood, however, is probably going to be Kirby and King Dedede thanks to the Gourmet Race but then again I don't really remember pizza being in the series at all. Maybe Meta Knight too.
no chance for ice climbers, any fire emblem character but like maybe mr game and watch was seen eating in some obscure game and watch game? I'd give like a 30% chance I'm just not that familiar with most of the G&W titles
Thinking Kid Icarus is gonna be a no because while it is definitely the wacky sorta thing they'd put in the game (and it's only slightly less era accurate for ancient greece than a tempura) I just don't think it's that likely. Wario is a definitely though, like 90% sure it's happened in the WarioWare titles and if it hasn't, tell Wario he needs to support his friends' businesses then. Snake isn't exactly the type to eat pizza and there wasn't really any opportunity for him to do so in the Metal Gear games, but the series has definitely had it's fair share of pizza eating in it, Rising Revengeance comes to mind. Sonic probably ate pizza in some weird spinoff or series but he is a chili dog guy so I'm not counting on it. Pikmin characters aren't even tall enough to eat pizza and I'm genuinely concerned about how ROB would canonically eat pizza.
wait oh god what would Villager be? I feel like there's at least one animal crossing game with eatable food so I'll just say it's a 50/50. Mega Man couldn't eat it unless he killed someone whose special power was eatiing pizza and Wii Fit Trainer wouldn't touch pizza with a 10 foot pole. Little Mac wouldn't either. Mii fighter's are gonna be a yes whether you subscribe to the "they're original characters made for smash!" or consider them part of the Mii series, I'm quite sure there's pizza in tomodachi life. I'm going to go ahead and assume in Pac-Man's 40 year history they've paid tribute to his original design concept. The rule for fantasy worlds is there's probably no pizza in them and Duck Hunt's only canonical appearences are just to die and laugh at you, no pizza in sight.
I think Ryu and Ken almost certainly have eaten pizza in official art but I'm not sure about the series itself, I'll just say Ken will probably have eaten pizza in some ending. I know I made the "fantasy worlds probably have no pizza in them" joke but I'm going to immediately pivot on that because Cloud. Do I need to explain? There's probably pizza in Final Fantasy VII. I can definitely see some Bayonetta side characters eating pizza but I'm not sure about her herself.
I have no idea what the cuisine of the Splatoon series is like but I feel like it's clever sea food pun related? Maybe an inkling has eaten pizza with anchovies or something. I don't think Castlevania would have any food besides pot roasts and turkey and if it does it wouldn't be the games Simon or Richter are in. Persona is probably the one most likely to have a character eat pizza, I just feel like there's at least one orderable pizza. Invoking fantasy world pizza rule again for Dragon Quest, for Terry I think they'd just have him eat stereotypically American foods like hot dogs and hamburgers. Obviously there's none for Min Min, Steve, and Kazuya (I mean tekken endings can get kinda wacky tho). And then Sora... i dont know what kinda disney world even has pizza.
I know this is probably going to be extremely inaccurate to schaf's video since that's a 50 minute ****in video but these are just my educated guesses. I felt like I forgot absolutely everything about these series when writing this but I guess people just don't talk about pizza in games that much.