You unlock Luigi throughout the story. You cannot miss it. Just keep on playing :)
You can not unlock Luigi in super Mario 64 without hacks, but he is playable in super Mario 64 DS
Link is not a character in Super Mario 64 DS. The available characters are Yoshi, Mario, Luigi, and Wario.
Yoshi, Mario, Luigi, and Wario
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Mario, Yoshi, Luigi, and Wario
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Luigi is not in super Mario 64 on the Nintendo 64, that was a rumor. However, on the ds version you can play as him along with Wario and Yoshi.
you can unlock luigi detective.
It isn't possible to get Waluigi in Super Mario 64 DS. Only Mario, Luigi, Wario, and Yoshi are playable characters.
on top of the castle
You need luigi
they were originally going to add him but there was no room for him but he is still found in the files of super Mario 64