Name: Mettaton EX
Game: UNDERTALE

Why this character won't appear in the Gassy Arcade:
This is Mettaton. He's a ghost inside of a robotic body. As should be obvious, neither ghosts nor robots poop. Also, I happen to really like this character. He's my favorite character in the whole game! So, even if it was possible, I doubt we'd lewd him. Thankfully, it isn't.

Done in collaboration with  TheOmegaError!