So would you be okay with a character from a porn game, if they weren't pornographic in Smash?
Only if they're actually a character capable of proper fighting or has abilities from the game in quesiton.
I am a Fate fan as is, but I don't care about the porn.
So frankly I don't care about their origins either. Especially when Nintendo promoted Bayonetta in Playboy and literally had Love Hotels(which didn't allow sex, heh, which fits into what I said too). I'm a person who doesn't care about that kind of stuff because they being a fun character to play as is the most important.
Though to be fair, that's also a huge exaggeration of what Bayonetta and even Fate is, two series that are good with getting characters but aren't simply about porn despite having some moments related to it(moreso Fate, but they literally got rid of all the sex scenes from all remakes and rereleases of the first Fate game, the only one to even qualify as porn, so it's a moot point). My standards are low. I do like stuff like Quest 64, you know.