Mitsuo has done the following roles in anime.

Aa Megami-sama Chicchaitte Kotoha Benridane	Gan-chan
Akira	Kaneda
Arad Senki Slap Up Party [2009]	Halsen
Beast Wars	Silverbolt
BECK	Tanabe
Boku no Marie	Karigari Hiroshi
Brigadoon	Mike White
Brigadoon	Poikun
DNA^2	Kakimaro Someya
Doukyuusei	Morooka Wataru
Ehrgeiz	Jay
Futari ha Pre Cure Splash Star	Dorodoron
Golden Boy	Kintarou Oe
Gun X Sword	Buchi
Hikari to Mizu no Daphne -Daphne in the Brilliant Blue- [2004]	Hanaoka Tsutomu
Hikaru no Go [2001]	Kurata Atsushi
Initial D	Takeuchi Itsuki
Jinki Extend	Karisu
Kodomo no Omocha (TV)	Tanaka-sensei
Kodomo no Omocha (TV)	Suzy
Koko ha Greenwood	Ikeda Mitsuru
Mahou no Stage Fancy Lala [1998] {Episode 22}	Sugio Takuya
Megazone 23 {part III}	Akira
Musekinin Kanchou Tylor	Sakai Kojiro
Nozomi Witches {volume 3}	Yuugo
Nurse Witch Komugi-chan Majikarte	Akahori Satoru
Onegai Teacher [2001]	Magumo Hyosuke
Ore no Imouto ga Konnani Kawaii Wake ga Nai 2 [2013]	Comet-kun
Ore Twintail ni Narimasu [2014]	Owl Guildy
Sasaki to P-chan [2024]	Marc
Sensei no Ojikan [2004]	Nakamura Gen (Oyaji)
Shakugan no Shana II [2007-2008]	Marchosias
Shakugan no Shana movie [2007]	Marchosias
Shin Megami Tensei Devi Chil (Debichiru) [2000]	Fenlil
Strange Dawn [2000]	Beret
Stratos Four	Sako
Tenshi ni Narumon	Dispell-sama
Time Stranger	Hasegawa Shinichi
Toriko [2011-2013]	Sunny
Urusei Yatsura {movie 3} [debut]	Magician Ruu
Vandread	Pyoro
Yagami-kun no Katei no Jijou [1990]	Ichigaya Kazuki

Mitsuo has done the following roles in games.

Angelique Trois [Playstation2]	Zefel
Fushigi no Kuni no Angelique [Win95, PC-FX, PlayStation, Sega Saturn]	Zefel
Kouda Mariko no Dokidoki On Air [WIN]	Iwata Mitsuo
Meguri Aisite [Playstation]	Hirayama Takeshi
Super Robot Taisen Original Generations [PlayStation 2]	Kail

Mitsuo has done the following roles in audio drama.

Aa Megami-sama Tokuten Ou [CD]	Nezumi-san
Guy Brave [CD]	Ken
Happy Boy [CD]	Kitsune
Kimagure Orange Road Original [CD]	Komatsu Seiji
Koko wa Green Wood [CD]	Ikeda Mitsuru
Tengai Makyou [CD] {Volume 1}	?