[[quoteright:220:https://static.tvtropes.org/pmwiki/pub/images/f03_1428029252067249_img.jpg]]
Hyo-sei is a Japanese voice actor and singer who was born April 21, 1973. Throughout her career, she has been known by three names: ''Kumiko Yokote'', her full name which she no longer uses, ''Hyo-sei'', her current stage name, and ''[[{{Engrish}} Erena]]/[[SpellMyNameWithAnS Elena Kaibara]]'', her alias for [[PornNames Eroge-related characters]]. She mostly voices {{Genki Girl}}s and {{Tsundere}}s, though on occasion she'll voice a seemingly EmotionlessGirl as well, like Tei Iku from ''VisualNovel/KoihimeMusou''.

She also has a pretty good singing voice, being able to sing both in a cutesy manner (mostly for Eroge songs) and in a more normal register. She released her first single, ''Fuyu Hanabi'', on her birthday (April 21) in 2010.

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!!Notable roles:
* Appli de Pumpkin in the ''[[VideoGame/FantasticNightDreamsCotton Cotton]]'' series
* Eru in ''Manga/ShugoChara''
* Indigo in ''VideoGame/{{Arknights}}''
* Irina Vladimirovna Putina in ''VisualNovel/MyGirlfriendIsThePresident''
* Mizuha Shiratori in ''VisualNovel/TheDevilOnGString''
* Montblanc in ''VideoGame/FinalFantasyTacticsAdvance'' ''[[AudioAdaptation Radio Edition]]''
* Ms. Taeko in ''Sexfriend''
* Nagi (Winona) in ''{{Anime/Pokemon}}: Advanced Generation''
* Narukami in ''Manga/KamisamaKiss''
* Natsuki Takamizawa in ''[[VideoGame/YoakeMaeYoriRuriIroNa Crescent Love]]''
* Neon in ''[[Creator/TatsunokoProduction Tatsunoko]] Fight''
* Oboro and Ayame Makishima in ''VideoGame/ActionTaimanin''
* Olive Cookie in ''VideoGame/CookieRunKingdom''
* Omi Takahata in ''VisualNovel/SayaNoUta''
* Regensburg in ''VideoGame/AzurLane''
* Shion Toumori in ''Literature/StrawberryPanic''
* Shirayuki in ''Literature/SisterPrincess''
* Sophia/Veludo in ''VisualNovel/LimeIroSenkitan''
* Superbia/[[spoiler:Misao Kusakabe]] in ''VisualNovel/ElevenEyes''
* Taeko Hasegawa in ''VisualNovel/SlowDamage'' (Credited as Elena Kaibara)
* Teiiku (actually [[Literature/RomanceOfTheThreeKingdoms Cheng Yu]]) in ''VisualNovel/KoihimeMusou''
* Tsunomon in ''Anime/DigimonFrontier''
* Venis in ''VisualNovel/TheyAreMyNobleMasters''
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