The voice roles that Akio has done are listed below.
Akio has done the following roles in anime.
| 3x3 Eyes [1991-1992] | Benares |
| 3x3 Eyes Seima Densetsu [1995-1996] | Benares |
| Aika [1997-1999] | Aida Gouzo |
| Ambassador Magma | Magma |
| Amon: Apocalypse of Devilman | Amon |
| Angel Cop [1989-1994] | Hacker |
| Armor Hunter Mellowlink | Lt. Keak |
| Arslan Senki | Andragoras III |
| Ayane-chan High Kick | Tange Kunimitsu |
| B.B | Kashira |
| Babel II (OAV) | Yomi |
| Baka to Test to Shoukanjuu [2010] | Nishimura Souichi |
| Bakuen Campus Guardress | Kijima Touta |
| Banner of the Stars I | Samson |
| Banner of the Stars II | Samson |
| Battle Flag of the Stars Special | Samson |
| Black Jack 21 [2006] | Black Jack |
| Black Jack [1995] | Black Jack |
| Black Jack Special | Black Jack |
| Bleach | Kyouraku Shunsui |
| Blue Seed | Kunikida Daitetsu |
| Chikyuu wo Sukue! Nakamatachi Chibi Neko Tom no Daibouken [1992] | Leonis |
| Chinmoku no Kantai | Fukamachi |
| Chou Kousoku Gran Doll | Grand Knight |
| Chuuka Ichiban! [1997-1998] {Episode 1} | narration |
| CLAMP Gakuen Tanteidan {Episode 1} | brother in law |
| Cowboy Bebop | Whitney Hagas Matsumoto |
| Coyote Ragtime Show | Mister |
| Dark Side Blues | Kenzou |
| Detatoko Princess [1997] | Morita |
| Dirty Pair Flash {2} | Calbee |
| Doraemon {Nobita no Sousei Nikki} | god |
| Dragon Half | Damaram |
| Dragoon | Bashua |
| F | Gorou |
| Fire Emblem | Cornelius |
| Fire Emblem | narrator |
| Full Metal Panic! [2001] | Andrei Kalinin |
| Fushigi no Umi no Nadia | Captain Nemo |
| Garzey no Tsubasa | Gelgog Aji |
| Genesis Surviver Gaiarth | Zaxon |
| Geobreeders | Yajima |
| Geobreeders 2 [2000] | Yajima Taichou |
| Ghost in the Shell: Stand Alone Complex | Bateau |
| Ginga Tetsudo Monogatari/Galactic Railways [2003-2004] | Barge |
| Ginga Tetsudou Monogatari -Wasurerareta toki no Wakusei- [2007] | Schwanhelt Bulge |
| Gundam 0083 | Anavel Gato |
| Gundam Wing | narration |
| Gundam Wing {Episode 1-2,4-5,27} | Mr Dorian |
| Gundam Wing Endless Waltz [1997] | narration |
| Hakkenden OAV [1990-1991] | Inumura Daikaku (Kakutarou) |
| Hakugei Densetsu [1997] | Ahab |
| Happy Moomin Family {new} | Muumin Papa |
| Hareluya II Boy [1997] {Episode 11} | Nightmare |
| Hi no Tori | chieftain |
| Hi no Tori TV {Dawn} | chieftain |
| Hyper Police | Batanen Fujioka |
| Jouki Tanteidan (Steam Detectives) | Night Phantom |
| Kabuto | Rasetsubou |
| Kaitou Saint Tail | Asuka detective |
| Key the Metal Idol [1994] | Aoi |
| Kindaichi Shounen no Jikenbo | Horinouchi Leo |
| Kinnikuman II Sei {Movie} | The Cyborg |
| Kizuna 1 | Araki Masanori |
| Koukaku Kidoutai | Bateau |
| Kousetsu Hyaku Monogatari | Choujirou |
| Kurau: Phantom Memory | Ayaka's father |
| Kurogane Communication [1998-1999] | Honi |
| Kyou Kara Maou | Gwendel |
| Kyoukara Oreha! | Shiratori |
| Legend of Basara | Khazan |
| Legend of Galactic Heroes | Chen |
| Licensed by Royal | Mister |
| Lightning Trap | Kotani |
| Lupin III {Steal the dictionary of Napoleon} | Mckaram |
| Mad Bull 34 | Sleepie |
| Magic Knight Rayearth | Windham |
| Magical Hat | Gord Baboon |
| Mahou Tsukai Tai! | Minowa Minoru |
| Mahoujin Guru Guru | fairy Saiko |
| Master Keaton [1998-1999] | Abdullah Abbas |
| Meitantei Conan (Detective Conan) | Yokomizo |
| Monster [2004-2005] | Milan Kolasch |
| Monster Farm [1999-2000] {Episode 29} | Captain Jim |
| Montana Jones | Montana |
| Nadesico | Misumaru Kouichirou |
| Nanako Kaitai Shinsho | Ogami Joji |
| Nanatoshi Monogatari [1994] | Kenneth Gilford |
| Neo Ranga | Haseoka Shogo |
| Oni | Takiyasha |
| Onikirimaru | Ishuuin |
| Otaku no Video | Banker Kanda |
| Otaku no Video | Narrator |
| Pat Labor | Gomioka |
| Pat Labor | Kataoka |
| Piano | Nomura Seiji |
| Porco Rosso | Curtis Donald |
| Princess Minerva | Whistler 12th |
| Raijin-Oh | Gokudou |
| Ray the Animation | Black Jack |
| Riki-Oh | Kuwabara |
| Rurouni Kenshin -Meiji Kenkaku Romantan- | Kurogasa |
| Rurouni Kenshin -Meiji Kenkaku Romantan- | Udo Jinei |
| Ryuuki Denshou | Bashua |
| Samurai Champloo [2004] | Okuru |
| Saver Kids {Episode 47,50} | Rasuto |
| Sci-Fi Harry | Mick |
| Silent Mobius (TV) [1998] | Yamigumo Razan |
| Sin the Movie | Vincenzo Mancini |
| Sol Bianca (1999) | Gwen John |
| Street Fighter II V | narrator |
| Sukeban Deka | Numa Jyuujou |
| Suzumiya Haruhi no Yuuutsu [2006] | Arakawa |
| Tekken | Jack 2 |
| Tekken | narrator |
| Tenchi Muyou | King of Jurai |
| Tenkuu no Escaflowne | Goau |
| Tenkuu no Escaflowne {episode 9} | Goau |
| Tetsuwan Birdy 1996] | Gomez |
| Tokyo Godfathers | doctor |
| Touch Cross Road: Kaze no Yukue | Fujimura |
| Twin Signal | Otoi Nobunosuke |
| Vampire Hunter The Animated Series | Demitri |
| Vampire Miyu (TV) {Episode 3} | Ohshima |
| Villgust | Murobo |
| Virtua Fighter | Van Kuur |
Akio has done the following roles in games.
| 3x3 Eyes Tenrin'ou Genmu [Win, Playstation] | Benares |
| Angelic Vale [Windows] | Gowen |
| Blue Seed [Sega Saturn] | Kunikida Daitetsu |
| Dai 4 Ji Super Robot Taisen S [Playstation] | Anavel Gato |
| Dororo [PlayStation 2] | ? |
| Dream Mix TV: World Fighters [GameCube, PlayStation 2] | Solid Snake |
| Farland Story [PC FX] | ? |
| Fushigi no Umi no Nadia [PC Engine] | Nemo |
| Game Tengoku [Sega Saturn] | Biku |
| Jo Jo no Kimyouna Bouken: All-Star Battle [PS3] | Wamuu |
| Kidou Senshi Gundam Gaiden -Colony no ochita chi de..- [Dreamcast] | narration |
| Kidou Senshi Gundam: Side Story 1-3 [Sega Saturn] {Side Story 1-3} | narrator |
| Kuu wo Kiru! [Win95] | ? |
| Langrisser -Dramatic Edition- [Sega Saturn] | King Iruzakku |
| Lunar Silver Star Story [Sega Saturn] | Lake |
| Lunar Silver Star Story [Sega Saturn] | Dain |
| Metal Gear Solid 2: Sons of Liberty [PlayStation 2] | Solid Snake |
| Metal Gear Solid [Playstation] | Solid Snake |
| Moonlight Lady [PC-Engine] | Gargoyle |
| Night Trap [MegaCD] | Simms |
| Onimusha [PlayStation 2] | Oda Nobunaga |
| Onimusha [PlayStation 2] | Duildenstern |
| Philosoma [Playstation] | Kinabalu |
| Popolo Crois Monogatari [Playstation] | King Gamigami |
| Popolo Crois Monogatari II [Playstation] | Gami Gami Maou |
| Quantum Gate I [Playstation] | Andrew Griffin |
| Quiz no Hoshi [PC Engine] | ? |
| Riglord Saga 2 [Sega Saturn] | Kamui |
| Schwarzschild W 2 [WIN98] | Boojudo II |
| SD Gundam G Generation Spirits [PlayStation 2] | Anabel |
| Sengoku Musou -Moushouden- [PlayStation 2] | Honda |
| Sengoku Musou 2 [PlayStation 2] | Honda |
| Sengoku Musou 2 Empires [PlayStation 2] | Honda |
| Sengoku Musou 2 Moushouden [PlayStation 2] | Honda |
| Sengoku Musou 3 [Wii] | Honda |
| Shinkisekai Evolution 2 [Dreamcast] | Gre Nade |
| Shinkisekai Evolution [Dreamcast] | Gre Nade |
| Super Robot Taisen A Portable [PSP] | Anabel Gato |
| Super Robot Taisen F Kanketsuhen [PlayStation] | Anabel Gato |
| Super Robot Taisen Impact [PlayStation 2] | Anaberu Gato- |
| Tales of Fandom Vol 2 [PlayStation 2] | Regal |
| Tamamayu Monogatari [Playstation] | Corisu |
| Valkyrie Profile: Toga wo seoumono [NDS] | Hyugo |
| Yuukyuu Gensoukyoku [Playstation, Sega Saturn] | Ricardo |
Akio has done the following roles in CD/radio dramas.
| Aika [CD] | Aida Gouzou |
| Ayakashi Ninden Kunoichiban Gaiden [CD] {Volume 1-2} | ? |
| Bouken Radio Movie [CD] {2} | Kuwamizu Gorou |
| Chou Kousoku Gran Doll [radio] | Grand Knight |
| Cinematic Sound Drama GetBackers [CD] {Legend of Vampire} | ? |
| Clock Tower 2 [CD] | Samuel Barton |
| Clock Tower 2 [CD] | Scissorman |
| Fire Emblem [CD] | ? |
| Fortune Quest [CT] | Bokuboku's father |
| Fushigi no Umi no Nadia -Yattara kou nacchatta Nadia- [CD] | ? |
| Gekkou no Pierce [CD] | king |
| Gundam Wing [radio] | narrator |
| Jojo's Bizarre Adventure [CD] | ? |
| Joker [CD] | Barley |
| King of Fighters '96 Drama CD [CD] | narrator |
| King of Fighters '98 Drama CD [CD] | narrator |
| King of Fighters 97 Drama CD [CD] | narration |
| King of Fighters 97 Gekitotsuhen [radio] | narration |
| King of Fighters 97 Shukumeihen [radio] | narration |
| Luna Silver Story Lunatic Festa [CD] {Vol 1} | Dain |
| Luna Silver Story Lunatic Festa [CD] {Vol 2} | Reiku |
| Marouou Fuu'unden [?] | ? |
| Metal Gear Solid [CD] | Solid Snake |
| Psychic Force [CD, radio] | narration |
| Sampaguita [CD] | ? |
| Scramble Wars "Yami no Labyrinth" Drama Hen [CD] | Zackson |
| Shadow Skill [CD] | Scar Face |
| Street Fighter EX [radio] | narration |
| Street Fighter II [CD] | ? |
| Tohshinden -Before Stage- [CD] | ? |
| Twin Signal Sound Theater [CD] | ? |
| Vampire Hunter [radio/CD] | Demitri |
| Vampire Hunter Gaiden: Shukumei no tabibito Donovan [CD] | NA |
