Ten

Ten is Lum's cousin who followed her to Earth, appearing as a baby with a single horn and a tiger-print diaper. Gifted with the ability to fly and breathe fire, he is a sharp-tongued and mischievous little alien who treats Ataru as his arch-nemesis, frequently punishing him with blasts of flame. While he puts on an angelic act around girls, he drops all pretense in front of Ataru, revealing his true nature as a loud and prank-loving troublemaker.