Complete the tasks listed to unlock the corresponding characters.

Dingodile - Win the Red Gem Cup.
Fake Crash - In Adventure Mode, do 50 consecutive boosts with the evil team.
N. Tropy - Beat all of the N. Tropy Ghosts in Time Trial Mode.
Polar - Win the Blue Gem Cup.
Pura - In Adventure Mode, do 50 consecutive boosts with the Bandicoot team.
Zam - Win the Purple Gem Cup.
Zem - Win the Green Gem Cup.