Hold select while player 2 or you as computer are picking the character and you can be the same character as player1 but a different colour.
Also hold L1 or R1 while picking a character and they will have different clothes.
But only season 1 characters (Tai,Matt,TK and Kari) and Ken can have different clothes.
More tricks, tips and cheats for this game are right here - Digimon Rumble Arena cheats
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