you could switch between the playstyles on the fly as link, but that miiiight've been a mod thing though. so it counts but not really.
also. poketrainer not being zelda is a very shitty argument.
you asked me for characters that can switch with a single input, I named characters that can switch with a single input. so what's wrong now, huh?
edit: cmc+ having a different engine doesn't matter. professor oak, an april fools character made as a joke, worked in 9.2's version of the engine, and it worked PERFECTLY FINE. 0 HITCHES WHATSOEVER.
edit2: hell, I'll even go out on a whim here. out of every character I listed, only *one* wouldn't really work in 9.5 and it's vent/aile. they're too much of a technological achievement that they really, REALLY don't feel compatible with 9.5. every other character, including the shiruzato link which came out 5 years ago, have genuinely zero reason to shit themselves in vanilla outside of being v8 exclusive or something stupid like that.