To get the following cheats to work, you must change the current character's name to the cheat code by renaming them in the status menu. You can use multiple codes together, and you can rename the character again with the effects still in place. For example, you could rename Alex to PLAYA and DAMAX and back to Alex for an Alex character with a lot of money and max stats. All cheats use upper case letters for the name.

DAMAX – All stats at maximum
PLAYA - $999,999.99 cash
XTRA0 – Adds Custom Char to inventory
XTRA1 – Adds Custom Self to inventory
XTRA2 – Adds Custom Move to inventory
FUZZY – Adds Mach Punch, Dragon Kick, Acro Circus, Grand Slam, Javelin Man, 
Slick Trick, Nitro Port, Twin Kick, Deadly Shot, Top Spin, Helicopter, and 
Torpedo to techniques
WUZZY – Adds Slap Happy, Pulper, Headbutt, Kickstand, Big Bang, Wheel Throw, 
Glide Chop, Head Bomb, Chain Chump, Jet Kick, Shuriken, and Flip Throw to 
techniques
WAZZA – Adds Boomerang, Charge It, Bat Fang, Flying Kick, Speed Drop, Bomb 
Blow, Killer Kick, Bike Kick, Slam Punk, Dragon Knee, God Fist, and Hyperguard 
to techniques
BEAR – Adds Pheonix Wings, Inlines, Springlines, Rocketeers, Air Merc's, 
Narcishoes, Magic Pants, Pandora Box, Skaterz, and Custom Fit to techniques