Gurio Umino a 14 year old boy, usually called by his family name "Umino", is a socially-awkward friend of Usagi Tsukino and her best friend Naru Osaka. He is very intelligent, but at points, can be arrogant and a bit of a know-it-all. He is usually the one to keep the others up-to-date on information on Sailor V, the strange crimes and rumours in Tokyo, and on students such as Ami Mizuno and Makoto Kino.
Umino has short spiky brown hair. His most notable trait is his large glasses with swirls in the lenses.