A Fan-Translation of Seiken Densetsu 3 should do you good. It's an RPG that can be co-operative if the second player presses start. :3 If you want a basic idea on the mechanics, just keep in mind it's the sequel to Secret of Mana, essentially.
Also, Battle Toads Double Dragon is a good one. It's, obviously, a combination of both Battle Toads... and Double Dragon. Look into it.