Aggressive Inline Cheats

Go to the Cheats screen on the options
menu and press Left, Left, Right, Right, Left, Right, Down, Up, Up,
Down, AI

Successfully complete the normal and hidden challenges in a level to unlock a bonus character. The characters are as follows:

Successfully complete the normal and hidden challenges in the following level to unlock the corresponding extra characters.
Movie Lot: The Bride
Civic Center: Goddess
Industrial: Junkie
Boardwalk: Captain
Cannery: Diver
Airfield: Bombshell
Museum: Mummy

Complete all the levels with 100%. The Ultra Skates give you the other blue stat point for every attribute.