I can't remember, but I believe I am level 27, my strongest toon being Bugs Bunny, second place is his Showbiz variant, third is Daffy Hood, and fourth is Hunter Yosemite Sam.
He is very strong! He has a move which gives him another move, the only one in the game, and this attack is incredibly powerful. I am going to level him up until he is one of my top 4.