A blast to play.
A comprehensive list of character classes
Play to win: Sonac, Tail, Picture of Shaq
Invulnerable: Goku (that made me laugh when I unlocked him), Knackles, Silber
Easiest trophies: Big Knackles (Play 5 minutes gets 30 emmaralds 100rangs without a miss all AFK)
Ones I didn't unlock: Shadoo (If only I could do missile kills), Vegeta, Probably Rogue.