how Luigi could have been added in Super Mario 64

Rowbro

Goomba
here's how Luigi could have been handled in Mario 64, he wouldn't be playable, but rather a support role, if you had at least 10 stars. go infront of the star statue in the courtyard Duck, and wait for Mario to nod 3 times, then Luigi would appear and say,"hey Mario, long time no see. Bowser trapped me in this statue, If you want me to find stars for you, talk to me". Luigi could have functioned the same way he did in Super Mario Galaxy. Same could have gone for Super Mario Sunshine
 
(that would look too fan-made but whatever) this looks too secret, and only fans would know how to do it. If this would happen, there should be a hint somewhere. But again, it would be a fan that would do this and not Nintendo. In fact, I don't even know if Nintendo are that interested in the "L is real".
 
the hint could probably be in the sign below the star statue, it could have told you everything you should do in order to unlock Luigi as an NPC
 
Here's a thought: Luigi is the main antagonist. Hardened and bitter by years of living in the shadow, his inner hatred is capitalized upon by Kamek, who uses his Magikoopa Magic to turn Luigi against his brother. The ultimate Mario plot (I'm claiming this BTW).
 
good thought, but maybe after you beat Luigi, then he'll function like he did in Super Mario Galaxy, or maybe, he'll not be an antagonist, because this will establish Luigi as Mario's brother
 
I don't see in any realm of possibility Luigi can serve as an antagonist to Mario unless Luigi is blatantly brainwashed Mr. L style.