Aimee

in ramp mode., complete the bowl ramp 

Bluebee

in challenge mode, complete all 10 combo stages and the final stage 

Clarice

in challenge mode, complete all 10 Gawoo attack stages and the final stage 

Grandma B

Complete the normal ramps.

Mr. Honda

in challenge mode,.complete all 10 trick stages and the final stage

King Gawoo

under the normal difficulty setting. complete street mode under the normal difficulty setting, then defeat King Gawoo in street mode (flip side)