Irucan

Irucan (イルカーン) is an aggresive dolphin-like enemy in Mega Man 5 and Mega Man for the Game Gear. It was originally an ocean surveillance robot. It appears only in the Marine Bike section of Wave Man's stage. It leaps up to varying heights to try to land on Mega Man.

Etymology
Its name is derived from "iruka", Japanese for dolphin.