Well if you play co-op, the second player is Luigi.
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In the original you can play as Mario and Luigi. In New Super Mario Bros DS you can play as MArio AND LUIGI. IN NEW SUPER MARIO BROS WII ITS MARIO, LUIGI, BLUE TOAD, AND YELLOW TOAD.
You can’t play as luigi in Super Mario 64! Because he is not in the game
Player 1 has 2 be Mario. Player two can pick from Luigi, Blue Toad, or Yellow Toad.
enter the 32 Star-Coin door to toggle between Mario and luigi
Only Mario but in the DS game you can play Yoshi, Mario, wario and luigi.