Gee Gee Loo Loo is a pseudonym for an English-language voice actor known primarily for work on anime series and films produced in the 1990s and early 2000s. The actor is most recognized for providing the voice of the character Washu Hakubi, the self-proclaimed greatest scientific genius in the universe, across numerous installments of the Tenchi Muyo! franchise.

The role of Washu Hakubi, also known as Dr. Washu, represents the most significant and recurring part of Gee Gee Loo Loo's voice acting career. Under the Gee Gee Loo Loo name, the actor voiced Washu in the original Tenchi Muyo! OVA series, Tenchi Muyo! Mihoshi Special, Tenchi Muyo! The Night Before The Carnival, and multiple episodes of Tenchi Muyo! Ryo-Ohki. The actor continued to perform the same character in various related films and television series, often credited under their primary professional name, Kate T. Vogt, in later productions. These additional performances as Washu include the films Tenchi Muyo! in Love, Tenchi Forever! The Movie, and the television series Tenchi in Tokyo and Tenchi Universe.

Beyond the central Washu role, Gee Gee Loo Loo's anime voice credits include other supporting characters in English dubs of popular series from the same era. These roles include Sonya in Dragon Slayer, Rouge in Final Fantasy: Legend of the Crystals, and Louise Tessen in Pet Shop of Horrors. The actor also contributed to major feature films, providing voice work for an Iron Town Woman and Tatara Women's Song in the English dub of Hayao Miyazaki's Princess Mononoke. Additional credits include Yuki (singing voice) in Psycho Diver: Soul Siren and a role in Cowboy Bebop.

The actor's body of work shows a recurring collaboration with the Tenchi Muyo! franchise and its various spin-offs and continuities, including the Magical Girl Pretty Sammy OVA where the pseudonym is credited as Washu Kobayashi. This long-term association with a single franchise across multiple series, OVAs, and films stands as the central pillar of their career as an anime voice actor.