Your headcanons

mario and luigi going no-mouth is the equivalent to the autism stare

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they're autistic and trying okay <3
 
The Birthday Girl is Mario's kart

1. It is red like Mario. If it was really Peach's Kart she would have a pink one.
2. It's in the shape of Mario's shoe
3. Mario looks amazing on this kart
tbf Peach's shoes are red.

Although the Birthday Girl more closely matches Paratroopa's shoes so maybe it's actually his kart.:koopa:
 
It would fit with my headcanon that I give Paratroopa she/her pronouns
 
When I replayed Super Paper Mario last year, I did a Fluttershy impression whenever I read Tippi's dialogue. She always ends her sentences with ellipsis, so I assume she speaks gently and quietly, like Fluttershy. It made the entire game so much more engaging for me.

EDIT: This is also because she is a butterfly, and Fluttershy has butterflies for her Cutie Mark, so yeah.
 
In Super Mario Party, at the beginning of the "Rattle and Hmmm" minigame, Toad says "All right! Pika!"

Don't believe me? Listen for yourself!
 
There was a Bowser headcanon thread on Reddit that I answered, so I'll go ahead and paste my answer here.

He's a big goofball when he's not being a royal pain to the surrounding nations.

His crush on Peach didn't start developing until a couple kidnappings later.

He lets Mario win. Why else would he put all the axes, buttons, bombs, Rocket Nozzle platforms, etc in his battle arenas? Heck, speaking of the Rocket Nozzle, he's the one who put FLUDD at Delfino Airstrip.

Kidnappings and fighting Mario started being fun for him and his troops, so now they're also a recreational activity and training regimen. He supplies his minions with infinite 1-Up Mushrooms so they can have fun without worry.

The Koopalings and Bowser Jr are all his biological children *dagnabbit*. I'm the world's biggest sucker for sibling teams, and a team of 8? I'll eat that up!

His shell doesn't come off, same with all others in his Koopa subspecies. His shell's spikes automatically retract