Talk to Mirko, she should give you a spare costume for Mei. I guess I should make a game guide after all.
Anyways i have few more suggestions. You should add more sf characters (if you want) i suggest Juri, R mika and karin (maybe should add her to the bar area.) Fatal Fury and King of fighters characters are also good options. I have no idea, how big you're gonna make this game but i fully support you in your vision. I absolutely love the game. I love doreen so much i actually loved how you added her in. Very rare to see her in games like this. 