You know, out of curiosity, has there been any confirmation of a Spirit from the "Puyo Puyo" series? I find it quite odd if there isn't at least one.
The series is owned by Sega, and the games are currently developed by Sonic Team. With "Puyo Puyo Tetris" being a pretty early release for the Switch, and a fairly successful one (I think), I would think that they'd at least get something in Ultimate. I mean, Sega and Sonic Team are already involved in Smash, so I don't think it'd be too hard getting a Spirit to represent the series. Especially since, according to Source Gaming's "observational study" of Japanese ballot votes, Arle was decently requested in Japan (apparently even beating Cloud and being the 5th most requested third party character).
I just find it interesting if they really don't have one.