Normally, only Jurai trees, such as Tsunami, can only create wings of the light hawk ("Ko-oh-yoku"). Tenchi can create wings without a tree's power, and convert those wings into other forms, as he demonstrated in his battle against Kagato (OVA Ep. 6).
Originally, when the series was named, "Tenchi Muyo" was chosen because Tenchi means "heaven and earth" and Muyo means "no need." Later it was discovered these two words also mean "this side up."
Ever wonder who the older woman of the bathhouse is (OVA Ep. 3, 9)? She's Tenchi's great aunt.