M.U.G.E.N.

[TheDudeIV]

Has anyone seen any MUGEN characters that urinate or defecate?

[Anime Lover]

searched on a whim and there actually is!
https://www.youtube.com/watch?v=UjDz4uCiEPU
'pantyless peeing lolicon girl'

from what I can gather, the more she get's hurt, the higher her pee meter goes up, but it also goes up as she does things too, so she gets more and more desperate to pee throughout the fight and at around 2:18 she actually has a special move where she can't hold it in anymore, dunno if it's automatic or manually triggered

[TheDudeIV]

Choiya has some characters that wet themselves upon being knocked out