Your headcanons

My favorite headcanon:
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Adding to your headcanon, Luigi likes the sci-fi minigames in Mario Party 9 including Surf's Way Up.
 
The Star Spirits are all powerful deity-like beings that maintain the balance between good and evil across the entire Mario multiverse, they gave their blessing to Rosalina as the mother of the Lumas and appointed Geno as the guardian of Star Road, a place that is often looked upon as the "holy" land of the Marioverse. Should a being of malicious intent approach Star Road, Geno is deployed to fend it off and ensure the sanctity of the seven stars.

When all else fails, the prophetic heroes of the world and two of the seven star children-- Mario and Luigi are destined to right the wrongs of evil and ensure that peace is maintained.
 
Luigi is secretly the main villain behind everything in the Mario series, and every other villain, including Bowser, is a robot being controlled by him. He is doing this because he wants to destroy his brother Mario for being more popular than him. He is actually very malevolent and tough, and him being cowardly is just a facade to hide his true intentions.
 
Why would he want to go through the trouble rescuing Mario then?
 
He most likely wants to humilate his brother as much as possible before destroying him. This headcanon would say that he controls Bowser and King Boo, so any time Mario is kidnapped, Luigi planned the entire thing as a form of torture/humiliation, and saved him to prolong his eventual destruction
 
The whole Dream's Deep segment in Dream Time shows us Luigi's unfiltered feelings about Mario and how much he cares about him, so much so that even in the face of giant intimidating enemies like the Robo-Drilldigger or Zeekeeper Luigi sums up the courage to become a giant and protect his bro.

If he really wanted to harm Mario out of jealousy, he could have done so very easily in the dream world.
 
JohnTJ said:
He most likely wants to humilate his brother as much as possible before destroying him. This headcanon would say that he controls Bowser and King Boo, so any time Mario is kidnapped, Luigi planned the entire thing as a form of torture/humiliation, and saved him to prolong his eventual destruction
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It sounds like Luigi's plan can easily backfire, as that's a pretty dangerous way of excusing oneself to "rescue" someone to earn his trust.
 
Daisy ate fast food a few days before the time of Mario Tennis: Ultra Smash's announcement.

-now that explains why in that game, people thought she looked so chubby compared to Peach!