Shattered Glass versions of Mario and Luigi, along with their arcade, NES and fire variants. There are 3 colour schemes for them. Pressing M or clicking the start flag shows the normal versions of the two. Pressing W shows the first SG Mario and Luigi colour schemes, based on Wario and Waluigi. Pressing R shows the second SG Mario and Luigi colour schemes, this time reversing their colours.
I'm planning of starting a Shattered Glass Nintendo universe, where protagonists are evil and antagonists are heroic, so it's a no brainer to start with Mario and Luigi.