From the Super Mario Wiki, the Mario encyclopedia

The RoboUrchin is an urchin enemy from Wario: Master of Disguise. They are only encountered in Sweatmore Peak inside the level during Wario's adventure there. They are more of an obstacle than an enemy and can easily be taken out with Captain Wario's torpedoes. They usually appear in groups of two or more and have no form attack. They are similar to an earlier enemy: Lurchin. According to its description, it is still only a baby urchin and has yet to learn the art of poking.

In-game description[edit]

A babe of a sea urchin whose heart is still young and pure. But soon he'll be poking folks with the best of them! Only then can he call himself a man! Er...a man-urchin.