Something random I thought I'd share, I figured out why I support Geno so much. Super Mario RPG isn't my favorite Mario RPG, and I don't really have a big attachment to Geno like most others in this thread. I think I support him more because Mario RPG games have been my favorite sub-series of the Mario franchise. I grew up with the Mario & Luigi games being some of my favorite games of all time, Super Mario RPG was awesome, and I'm only now getting to the Paper Mario games and I'm enjoying it a lot so far.
Geno to me is more of representing the Mario RPGs as a whole, and I really admire that idea. Also, reviving a character who everyone thought was gone forever in Smash is just such an epic concept, and Geno would likely have the coolest moveset in the game. And I feel Geno might usher in a new era of Mario RPGs, so I'd be excited to see what the future holds (as long as Nintendo strays away from mediocrity.)