I forgot all about the fact that visual novels are a thing that could potentially be represented in Smash. Not that I see it happening, but this would be crazy! The DEEN show was boring, but the first season of Fate/zero was really topnotch. Saber getting in would be the perfect visual novel rep, I think, and I'd be happy to see her, and even happier to see her yell "ECUSU... CALIBAAAAAAAAAR!" for her Final Smash. It'd be hilarious if Caster was the Assist Trophy, and he lured in opponents with helpful items, just to do a huge amount of damage on them if they get too close (but if I'm not mistaken, he didn't originate from the visual novels? If that's right, he wouldn't make it in. It'd probably be Gilgamesh?).
Oh man, imagine a playable Hououin Kyouma/Okabe. Starts off madly running back and forth, throwing around bananas, drinking Dk Pepper to heal up, but becomes a lot weaker if you start taking stocks from his teammate(s) or knocking off assist trophies he's bought out. Final Smash is a satisfying punch based on that amazing scene (FB, FB, FB, FB, FB...).