It's a really nice mod! I love being able to play as some of my favorite characters (Especially Vivian)! My only real issue with it is that, at least with the 3.0 release, I'm getting Script Errors when loading the game with this mod. Plus the custom SFX don't seem to work most. It works when using any of the characters who use SFX from Luigi, Wario, or Toad, but for characters with unique SFX like Vivian, it just plays Mario's SFX.
Still love the mod though, so I'm giving it 5 stars!