It'd be pretty cool to have Metal Mario as an "alt" character.

[RedFly]

Alternate character as in Giga Bowser or Sopo by holding down L/R while selecting Mario, it'd be a nice homage to Smash 64.

And it wouldn't really require any effort either, it's just a Metal Box effect!

 

[Hinichii.ez.™]

Not really... i rather have the super mario sun shine outfit or one of his new power ups outfits with some different effects or something actually cool
Thats just me

 

[RedFly]

Not really... i rather have the super mario sun shine outfit or one of his new power ups outfits with some different effects or something actually cool
Thats just me

Mario Sunshine outfit as an alt character? Unless you mean costume, then why not both?

 

[Osmosis124]

I'd also like more power up colors like red star mario, ice mario, acorn mario, and bring back the wario colors (so I could look like a Laker).

 

[RedFly]

I'd also like more power up colors like red star mario, ice mario, acorn mario, and bring back the wario colors (so I could look like a Laker).

...Well those aren't alt characters but okay. Cool.