Your headcanons

Yeah that wasn't even insinuated. It can be interpreted that way, but requires more fanwank than even this channel could account for.
 
Luigi's only dark side would be where the sun doesn't shine. :luigi:

In Isle Delfino after Bowser Jr. Shenanigans that is.
 
That E. Gadd is a freelance inventor and the paintbrush wasn't stolen from him, but he was hired by Koopa Jr. to make it for him and his Fake Mario guise.
 
After they found out, they banished E Gadd from having playable roles because if he was ever a playable character, he'd make Mushroom Kingdom implode, but E Gadd did pay some people to AstroTurf for wildly unsuccessful E Gadd support campaigns for Mario Kart.
 
Mario isn't normally scared of heights, but roller coasters freak the hell out of him.
 
Yoshi broke Mario Kart track design regulations when he plastered banners of his face in front and behind the finish line of Yoshi Circuit in Double Dash.