- Before venturing as a voice actress, Kobayashi worked as a model for magazines.
- In 2008, she was nominated for "Best New Actress" at the second edition of the Seiyuu Awards.
- In 2003, she auditioned for the role of Setsuna Sakurazaki in Negima! Magister Negi Magi, beginning her career as a voice actress.
- In 2008, she released her first album YOU&YU and her first mini-album, ROCK YOU!!.
- She is a fan of rakugo, and she was very happy that she cried a lot when she got the role of Konatsu in Showa Genroku Rakugo Shinjuu.
- In 2010, she created the musical group Crush Tears.
- In 2007, she made her debut as a singer with the single Sora no Kotoba, which was the second closing theme of the Saint October anime.
- On December 29, 2017, she announced her marriage on her Twitter account.
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