Who are all the characters in Sonic Rivals 2

The playable characters in this game are:
Sonic the Hedgehog, Miles "Tails" Prower, Knuckles the Echidna, Rouge the Bat, Shadow the Hedgehog, Metal Sonic, Espio the Chameleon and Silver the Hedgehog. However, Mr. Eggman (duh!) Mr.Eggman NEGA, and a lot more main characters can be found in the game. The only real way to know who all the characters are is to have the game yourself or know someone who does.