Yeah basically just me. There's a crew from the MNFGC (minnesota fighting game community) that has a Facebook page. There are casuals at Level Up Games in St Paul on Wednesday nights. That might be a good place to start.
So SCII had several unlockable characters.
Exibit A:
Characters
Mitsurugi- Starter character
Heihachi- Starter character (Exclusively on PlayStation 2 and HD Online)
Link- Starter Character (Exclusively on Nintendo GameCube)
Spawn- Starter Character (Exclusively on Xbox and HD Online)...
idk - I think the point of a guest character is cross-marketing. A character like Geralt of Rivia is a character that brings folks from a popular franchise. So 'popular franchise' is one video game market.
Noctis was cross marketing to get a popular market to play tekken. Maybe there's...
A materia build out would be rad - like a different move list based on your materia decisions (maybe linked to the outfit). A materia build out could also be easily linked to the weapon choice and that could be for any of the FF7 characters.
I like your Star Wars idea, but I think that if we get a Star Wars character (especially Yoda again!) I think it's far more likely to be Kylo Ren (basically Darth Vader style) and Rey (basically apprentice style) than any of the classic Star Wars cast. The only question is who gets the Yoda...