Mayumi Yamaguchi is a seiyu from Iwata Prefecture. Her [[IncrediblyLamePun Forte]] is playing CoolBigSis and KidHero characters who tend to be the {{Only Sane Man}} of the group.

!!Notable roles by Mayumi Yamaguchi:

* Mike and David in ''[[ChisSweetHome Chi's New Address]]''
* Gabumon in ''DigimonAdventure'' and ''DigimonAdventure02''
** Jianliang Lee in ''Anime/DigimonTamers''
*** Omegamon ([[VoiceOfTheLegion with]] ChikaSakamoto) in ''DigimonTamers: The Adventurer's Battle''
** [=MetalGarurumon=] X in ''Anime/DigimonXEvolution''
* Gachagiri in ''DennoCoil''
* Envy in ''Anime/FullmetalAlchemist''
* Forte Stollen in ''Anime/GalaxyAngel''
* Leon in ''OjamajoDoremi''
* Grandice/Grenmah in ''GranadoEspada''


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