From Sonic - Wiki on Neoseeker

[edit] History

Sonic Riders: Zero Gravity is the sequel to Sonic Riders. The game has two central storylines, one following the heroes and one following the Babylon Rogues. The game was released for the Playstation 2 and Nintendo Wii.

[edit] Characters

There are a total of 18 characters in the game, split into 3 categorys: Speed, Fly and Power. The categorys allow the characters to access special shortcuts during races.

[edit] Speed

• Sonic the Hedgehog
• Amy Rose
• Jet the Hawk
• Shadow the Hedgehog
• Blaze the Cat
• Samba De Amigo

[edit] Fly

• Wave the Swallow
• Miles "Tails" Prower
• Silver The Hedgehog
• Cream the Rabbit
• NiGHTS
• Rouge The Bat

[edit] Power

• Knuckles The Echidna
• Dr. Eggman
• Storm the Albatross
• Billy Hatcher
• SCR-GP (Meteortech Robot)
• SCR-HD (Meteortech Robot)