Quiz

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.