Mayumi Yamaguchi (山口眞弓) (born May 12, 1975) is a Japanese voice actress from Iwata Prefecture. Her Forte is playing Cool Big Sis and Kid Hero characters who tend to be the Only Sane Man of the group.
Notable roles by Mayumi Yamaguchi:
- Deb (Kristen Johnston) in the Japanese dub of Bride Wars
- Envy in Fullmetal Alchemist (2003) (darrin'd by Minami Takayama in Brotherhood)
- Forte Stollen in Galaxy Angel (reprising the role for Galaxy Angel II and Galaxy Angel Rune)
- Digimon
- Gabumon in Digimon Adventure, Digimon Adventure 02 and Digimon Survive (her debut role)
- Jianliang Lee in Digimon Tamers
- Omegamon (with Chika Sakamoto) in Digimon Tamers: The Adventurer's Battle
- MetalGarurumon X in Digimon X-Evolution
- Gachagiri in Den-noh Coil
- Grandice/Grenmah in Granado Espada
- Linda in Gad Guard
- Leon and Shinzo Sebastian Osawa in Ojamajo Doremi
- Mike and David in Chi's New Address
- Masaru Katoh (as a kid) in Gantz
- Bomu in the Popolocrois anime
- Seishu's mother in The Twelve Kingdoms
- Fhoton in Duel Masters
- Taichi Koga in Kenichi: The Mightiest Disciple
- Crowne Applefield in Live A Hero
- Morgaine la Fay in the Japanese dub of Justice League
