Character: Washuu

Hakubi Washuu is a self-proclaimed greatest scientific genius in the universe. Her character differs depending on the continuity, though she sometimes displays a number of innate powers which she rarely uses, preferring to solve problems with reason or technology. In all incarnations, Washuu has also shown to be somewhat prudent and is generally trickier to fool than Tenchi or the other girls, which makes it harder for her to fall into an enemy trap. In all three Tenchi series Washu had also created an inter-dimensional laboratory in the closet of the Masaki house, although her laboratory is a lot bigger in the OVA series than in both of the TV series.

Kozuka Washuu is Sasami's cooking teacher. She is also the mentor/advisor of the secret magical girl club and teaches its members the fundamentals of being a magical girl. Even though she is recruited by the school, she is in fact from the world of the witches. She is also Ryo-Ohki's mistress, using the poor cabbit in some of her cooking demonstrations. Although she is the cooking teacher, it was revealed that she (ironically) cannot cook. Despite being from the world of the witches, she is a normal human. People like her are labeled "Story Tellers".

Source: wiki