A pretty big one, actually.
@Ayumi Tachibana brought up a big 5chan post from around the release of SSBU's base game, detailing negotiations for characters who didn't show up. It got Steve and Erdrick right, went into detail about how Sora and Geno were considered by dropped, and noted that Sephiroth was in consideration as well. Aside from that, it also mentioned that Chun-Li was dealt for but "was replaced by Ken somehow," and both Lloyd and Yuri were in the planning stages but didn't show up either.
This one ended up called stuff like the "Chun-Leak" or "Tales of Chun-Li" despite the fact that both only got a sentence dedicated to them, so here's the important parts:
"Chun-Li was planned but replaced by Ken somehow. Lloyd and Yuri were also in the planning stages, but they disappeared too.
That's it. That's the post."