A Crack in Time, the bad boy costume can be unlocked by inputting this elaborate series of buttons and directions on the pause screen: Up, Right, Down, Left, Triangle, Square, X, Circle, R3. It's called a "cheat."
Bancho Ratchet was the winning entry in a Japan-only contest for CoroCoro Magazine. As for what a Bancho is, the best explanation we can figure is a "delinquent," especially with Ratchet's resemblance to John Travolta's character in Grease. Well, if you ignore the flippin' huge ears.