She attended Tokai University, but left because of her lack of interest.

She is best known for voicing Shinji Ikari in Neon Genesis Evangelion, Yugi Mutou and Dark Yugi in the Toei version of Yu-Gi-Oh!, Makoto Naegi and Nagito Komaeda in the Danganronpa series, Kurama in YuYu Hakusho, Sailor Uranus in the Sailor Moon series, Hanako and Tsukasa in Toilet-Bound Hanako-kun and Yukito Tsukishiro/Yue in Cardcaptor Sakura.

Ogata began working as a musical actress, attending the same classes alongside Rumi Kasahara and Shiho Niiyama.

Because of her husky voice, she is often typecast as either young men and boys or tomboyish women (a famous example of this being Sailor Uranus, a popular character from Sailor Moon, known for being a charming tomboy in her civilian form).

It is also because of this that she is sometimes referred as "Aniki" ("Big Brother" in Japanese, usually used in gangs) by fans.