These are all of the canon characters who you can possibly play as. If you have a good reason to, and a want to, play as this character, PM Deedle Deedle Dee with a short RP sample in character.

Luigi: OPEN
Princess Peach: OPEN
Bowser: Deedle Deedle Dee
Toadsworth: Deedle Deedle Dee
Wario: OPEN
Waluigi: OPEN
Rosalina: OPEN
King Boo: OPEN


If you know any more Canon characters that ought to be playable, post right here in this comfortable little thread.