To unlock the characters listed below, satisfy the corresponding requirements.

Unlockable	How to unlock
Cube/Combo	Finish Chapter 1.
Garam	Clear Garam's challenges.
Goji	Earn a JET ranking on all Grind City stages.
Gum	Clear Gum's challenges.
Love Shockers, Noise Tanks	Earn a JET ranking on all stages (including Golden Rhino stages)
Mew	Finish all City of Night stages and beat Mew when she challenges you.
Poison Jam	Earn a JET ranking on all Kogane-cho stages.
Pots, the Dog!	Clear the game with the Jet ranking on all stages (Story mode and basic stages)
Slate	Win a race against Slate in Kogane-Cho.
Tab	Clear Tab's challenges.
Yo-Yo	Clear Yo-Yo's challenges.