I'd probably just want a Wrecking Crew reboot. Waluigi seems like he could fit in there with ease.
You come here, on this the day of my daughters wedding, and insult me with bad boxart megaman. I'm hurt, truly I am. His destiny was to be buried in shame.
Nah he just looks like his destiny should be buried in shame!
He'll show you!
This. Maybe make it a horror dating sim where mid way through it turns into a horror based VN.
Winner winner chicken dinner.
I was thinking something along the lines of this. A puzzle-y platformer, perhaps a Metroid-lite, with each of the characters having their own abilities going through certain sections of the stage. But seeing these 4 in a turn based battle together would be fantastic, just have to wonder how the game mechanics would work.