Badtz Maru

Badtz-Maru is a mischievous, self-centered character who openly enjoys being bad, though the description leaves open whether he may be nicer underneath. His name combines "batsu," the Japanese symbol for a wrong answer, with "maru," the circle marking a correct one, producing the "wrong-correct" wordplay often represented as XO. His classic expression pulls one eye down while sticking out his tongue.