Mega Water S. is the brains of the Genesis Unit A kappa-themed robot, Mega Water S. attacks by firing harpoons, covering himself in a watery shield, and attempting to push the player off the battlefield. Despite being the smartest of his group, he lacks confidence within himself, and often quarrels with the group's leader, Buster Rod G. Being based on a kappa (more specifically, the character Sha Wujing from Journey to the West), he has a liking for shirikodama and dislikes raw fish.