Amy Rose
The main playable characters in the game 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 (E-102 Gamma and Chaos are not playable in Story Mode, but they are playable in Battle Mode and Challenge Mode when you unlock them in the Story Mode), as well as the original character Emerl, whose Skill Copy allows players to teach him different fighting abilities throughout the game.