In Super Mario 64 ds were you peach?
Peach is with Bowser locked away in her own castle and Mario must save her with his friends.
You have to either beat the final bowser or get every power star I HAVE A BETTER ANSWER! You cannot be Peach in Super Mario 64 or Super Mario 64 DS. Unless, you have Project 64 or an AR (Action Replay). Project 64 lets you play Nintendo 64 games on your computer and it comes with cheats. An AR is hard to explain.
If you mean the games that involve defeating Bowser and rescuing Peach... Super Mario World (Playable with Mario) Super Mario 64 (Unplayable) Super Mario Sunshine (Playable with Mario) Super Mario 64 DS (Playable) New Super Mario Bros. (Playable in multiplayer minigames) Super Mario Galaxy (Save file icon) New Super Mario Bros. Wii (Playable with Mario or other characters) Super Mario Galaxy 2 (Playable with Mario/Luigi)