Original: The main playable characters are Sonic the Hedgehog, Miles "Tails" Prower, Knuckles the Echidna, Amy Rose, Shadow the Hedgehog, Rouge the Bat, Cream the Rabbit, E-102 Gamma, and Chaos.
Simplified: People can play as Sonic the Hedgehog, Tails the Fox, Knuckles the Echidna, Shadow the Hedgehog, Rouge the Bat, Amy Rose, Cream the Rabbit, E-102 Gamma, Chaos 0, or a new character called Emerl.