Goku as Sonic the hedgehog

Vegeta as Shadow the Hedgehog

Gohan (teen) as Classic Sonic the Hedgehog

Piccolo as Knuckles the echidna

Krillin as Miles tails prowler/Tails the fox

Yamcha as Vector the crocodile

Tien as Espio the chameleon

Chiaotzu as Charmy Bee

Trunks as Silver the hedgehog

Frieza as Rouge the bat

Jet the Hawk as Android 17

Wave the swallow as Android 18

Other Characters: Cream the rabbit, Vanilla the Rabbit, Metal Sonic, Tangle the lemur, Whisper the Wolf, Omega E-123, Dr. Eggman