Looking for a game that has coop, character custimization, and pvp?

Something like diablo 2, or castle crashers, baldurs gate dark alliance, i have 3 brothers and i want to try and find a game we'd all want to play, we can work together and then try and fight each other, as well as building up our own custom characters, we have ps3, ps3, and pc but only if the game has very low requirments.