Play as Aimee
Finish the bowl ramp in ramp mode to unlock Aimee.
Play as Bluebee
Finish all 10 combo stages and the final stage in challenge mode to unlock Bluebee.
Play as Clarice
Finish all 10 Gawoo attack stages and the final stage in challenge mode to unlock Clarice.
Play as Grandma B
Finish the normal ramps to unlock Grandma B.
Play as King Gawoo
Finish street mode on the normal difficulty setting, then defeat King Gawoo in street mode (flip side) on the normal difficulty setting to unlock him.
Play as Mr. Honda
Finish all 10 trick stages and the final stage in challenge mode to unlock Mr. Honda.