Mr. L, for those who are unfamiliar with him: www.mariowiki.com/Mr._L
The pose in panel 1 was based off the pose he actually does in Super Paper Mario.
In game, Mario & the crew couldn't tell that Mr. L was actually Luigi. Here, it's a little different xD
The costumes that Mario, Peach, and Bowser are wearing remind me of the palette swaps in the Super Smash Bros series (if you know what I mean
Anyway, hope ya enjoy~