Unchimu

Unchimu (ウンチム) is an original RPG-style enemy that Mario and Yoshi face in the last chapter Super Mario-kun volume 7. Its name is derived from the Japanese word「ウンチ」(unchi), which means "feces".

While looking for the Star Hana in the tall grass, Yoshi comes across a pile of feces and jokingly treats it as an enemy, but much to their surprise, it actually comes to life and fights them back. After shocking Yoshi with a laser from its mouth, Mario awaits for its next move, but the Unchimu explains that, following the RPG rules, it is their turn to attack now. With just a few punches, the duo wins and enjoys the loot.