These are the skins you can get for Crash. Wearing the skin makes it so you can knock-out/kill the creature your skin is from. Ex. If you wear the Spike Skin, you can knock him out in one hit, then jack him.

Effect	Code
Goar Skin	Jack 30 Goars
Koo-ala Skin	Defeat 150 Koo-Alas
Ratnician Skin	Defeat 200 Ratnicians
Rhinoroller Skin	Jack 30 Rhinorollers
Snipe Skin	Jack 50 Snipes
Spike Skin	Jack 50 Spikes
Battler Skin	Jack 35 Battlers
Bratgirl Skin	Defeat 130 Brat Girls
Doom Monkey Skin	Defeat 500 Doom Monkeys
EE-Lectric Skin	Jack 50 EE-Lectrics
Halloween Skin	Complete 50% of the game.
Magmadon Skin	Jack 50 Magmadons
Scorporilla Skin	Jack 15 Scorporillas
Shellephant Skin	Jack 15 Shellephants
Sludge Skin	Jack 50 Sludges
Stench Skin	Jack 50 Stenches
Valentine Skin	Collect all Gold Idols
Voodoo Bunnie Skin	Defeat 200 Voodoo Bunnies