Custom character appearance:
Platform: GameBoy Advance
Successfully complete the game to unlock the Kasutamu Kaozura item. It will allow your character's appearance to be customized.
Increase reputation:
Platform: GameBoy Advance
Repeatedly run into a wall to increase your reputation by one point each time.
Custom char:
Platform: GameBoy Advance
Change your name to XTRA0 (case-sensitive) in the status menu.
Custom move:
Platform: GameBoy Advance
Change your name to XTRA2 (case-sensitive) in the status menu.
Custom self:
Platform: GameBoy Advance
Change your name to XTRA1 (case-sensitive) in the status menu.
Deleted saved games:
Platform: GameBoy Advance
Change your name to ERAZE (case-sensitive) in the status menu.
Unlock Meet Todo
Platform: GameBoy Advance
Must have a reputation of either equal or higher to getting Kobayashi unto your team, he is located at the 2nd shopping place in the game.
Unlock Meet Titus
Platform: GameBoy Advance
Must have a reputation of either equal or higher to getting Thor unto your team, he is located at the 2nd shopping place in the game.
Unlock Have Ted join your posse
Platform: GameBoy Advance
Decline Rex's offer to join and leave the area, come back to where Rex was, beat everyone up, and then you shall meet Ted.
Unlock Have Jesse join your posse
Platform: GameBoy Advance
Beat Turk 5 times and Jesse will appear (requires high reputation for him to join you).
Unlock Get Sonokwa and the Senridai Bombers
Platform: GameBoy Advance
Play as 1 player without Riki and beat the Senridai Bombers anywhere 3 times then go to the 2nd place in the game and beat everyone there.
Get Kumada
Platform: GameBoy Advance
Decline Himada's offer to join you and come back and fight everyone and Kumada will be there.
Fight Riki/Kunio
Platform: GameBoy Advance
Start the game in 1 player mode only not 2 player mode and go outside the 2nd factory and you will fight your ally.