Yes, to develop the relationship with Mirko further, and then with Chun-Li, you first need to unlock the first scene in the shower with Mei. As for Power, I already have some plans for her
126 days ago(+2)
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. 