Washu Hakubi, the greatest scientific genius in the universe, is a key character in the Tenchi Muyo! metaseries.

In the Tenchi Muyo OVA Washu is one of the Chousin; three sister goddesses who created the multiverse, the other two being, Tsunami and Tokimi

In the Magical Girl Pretty Sammy OVA, she is an Earth child prodigy known as Washu Kobayashi. Graduating from M.I.T. at eleven years old, she became the high school science teacher at Raioh Academy.

In Magical Project S, Washu Fitzgerald Kobayashi is an American and. She is a teacher at Sasami school and the first human to be fully aware of Sasami's secret identity as Pretty Sammy and only moved in next door to Sasami's house to keep an eye on Sasami and analyze her magic for research purposes.