Lum

Lum (ラム, Ramu), sometimes called Lum Invader, is the female protagonist of Urusei Yatsura. She is a Oni alien hailing from the planet Oniboshi. She was chosen to represent her kind in a game of tag against a human named Ataru Moroboshi to determine the fate of planet Earth. After Ataru defeats her, she misunderstands his victory chants as a proposal to marry her, thus she forces herself into his life and becomes Ataru's loving "wife' much to the latter's chagrin.