On the show My-HiME he is Sakomizu Kaiji.
Akio voices Cytomander on Tengen Toppa Gurren Lagann
You can hear his voice as Hokuto no Kobun on Cromartie High School.
On the show Shôjo kakumei Utena- Girl Revolution Utena he is a Schoolboy for unknown episodes.
He is Tsutomu Tachibana on the Wind: A Breath of Heart (OAV) and Wind: A Breath of Heart TV show.
On the anime show Samurai Champloo He voices Kazunosuke (episode 18) and on the anime show Samurai Deeper Kyo he voices Makora/Kotaro; Jimon.
On the special Pokemon Mystery Dungeon: Team Go-Getters Out of the Gate! he voices Bulu.
Akio voices Patrick and various extras on Galaxy Angel. He voices kanoe on X. He voices Nataku on Saiyuki.
In the vidoe game Final Fantasy X & Final Fantasy X-2 Akio voices Isaaru.
He is Hatsuharu Sohma in the TV show Fruits Basket and is Miho Karasuma in the TV show Witch Hunter Robin.