is a Japanese actor, voice actor, and narrator from the Tokyo Metropolitan area. He is currently a freelancer, but had previously been attached to Mausu Promotion.
The warm, calm quality of his deep voice has landed him many roles in films, dubbing, animation, and video games. He is most known for the roles of second generation Jigen Daisuke in Lupin III, the titular protagonist in Black Jack, Solid Snake, Naked Snake, Solidus Snake, and Venom Snake in the Metal Gear series, Gamigami Devil in Popolocrois, Ryoma Hoshi in Danganronpa V3: Killing Harmony, Shunsui Kyouraku in Bleach, Lieutenant Garuru in Sgt. Frog, Gwendel von Voltaire in Kyo Kara Maoh!, Batou in Ghost in the Shell, Blackbeard in One Piece, Tadakatsu Honda in the Samurai Warriors and Warriors Orochi series, Sango and Jugo Yokomizo in Detective Conan, Bryan Hawk in Hajime no Ippo, Zen Shigaraki/All For One in My Hero Academia, Thorkell in Vinland Saga, Wamuu in JoJo's Bizarre Adventure, Anavel Gato in Mobile Suit Gundam 0083: Stardust Memory, and Xehanort in the Kingdom Hearts series.
He is also the official dub voice for many Western actors, including Steven Seagal, Nicolas Cage, Antonio Banderas, Dolph Lundgren, Samuel L. Jackson, Denzel Washington, and Dennis Quaid.
Mausu Promotion announced on January 7, 2017 that Otsuka had married someone outside of the voice acting industry.
On March 31, 2026, Mausu Promotion announced that Otsuka had left the agency to become an independent voice actor.
Early life Akio was born as the eldest son of Chikao Ohtsuka, who was renowned for voicing Nezumi Otoko in GeGeGe no Kitarō and for dubbing the voice of Charles Bronson. Masako Nozawa has recalled that she used to change Akio's diapers when he was a baby. Kiyoshi Kobayashi also knew Akio during his childhood and affectionately called him "Akio-chan." The two later co-starred in Mobile Suit Gundam 0083: Stardust Memory. Furthermore, the role of Daisuke Jigen in Lupin the Third was passed from Kobayashi to Akio.
Stage Year Title Role Notes 2024Thanatos Inspector David Swain
Filmography Television animation Year Title Role Notes 1988 F Gorou 1989 Mobile Police Patlabor Gomioka, Kataoka Jungle Book: Shounen Mowgli Sander Alfred J. Kwak Franz Ferdinand, Ring Master Magical Hat Gord Baboon 1990 NG Knight Ramune & 40 Yorurun Karakuri Kengo Den Musashi Lord Shutentaiga Tanoshii Moomin Ikka Moominpappa Nadia the Secret of Blue Water Captain Nemo 1991 Anime Himitsu no Hanazono Hawkins Kinkyuu Hasshin Saver Kids Rasuto Lupin the 3rd: Napoleon's Dictionary Makkaramu 1992 Aah! Harimanada Harimanada Isao Juliano Anime Himitsu no Hanazono Hawkins Yōyō no Neko Tsumami Yo Yo Lupin III: From Russia With Love Donbino 1994 Soreike! Anpanman Naganegiman / Negi-ojisan Tottemo! Luckyman Saikyou-Danshaku Blue Seed Daitetsu Kunikida Magic Knight Rayearth Wind God Windham Mahoujin Guru Guru Fairy Saiko Montana Jones Montana Jones Shippu! Iron Leaguer Rebooted Thirteen 1995 Saint Tail Detective Asuka / Asuka Sr. Mobile Suit Gundam Wing Narrator, Vice Foreign Minister Darlian Street Fighter II V Barrack, Narrator Tōma Kishinden ONI Takiyasha Ninku Shigure Ninku Virtua Fighter Van Kuur 1996 Martian Successor Nadesico Kouichiro Misumaru City Hunter: The Secret Service McGuire Shōnen Santa no Daibōken Luke, Rye The Vision of Escaflowne Goau Detective Conan Juugo Yokomizo Rurouni Kenshin: Meiji Swordsman Romantic Story Udō Jin-e 1997 Vampire Princess Miyu Black Kite, Ohshima Clamp School Brother in Law Cooking Master Boy Chou Yu In The Beginning: The Bible Stories Young Ezekiel Hyper Police Batanen Fujioka Hakugei: Legend of the Moby Dick Ahab Flame of Recca Kai 1998 Steam Detectives Night Phantom Cowboy Bebop Whitney Hagas Matsumoto Silent Möbius Razan Namigumo Kurogane Communication Honi Trigun Rai-Dei the Blade Neo Ranga Shogo Haseoka Legend of Basara Khazan 1999 Puppet Master Sakon Katsumi Oki Power Stone Vargas Monster Farm Captain Jim 2000 Ghost Stories Ouma Kindaichi Shounen no Jikenbo Leo Horinouchi Sci-Fi Harry Mick Banner of the Stars Samson One Piece Captain Joke 2001 Cyborg 009: The Cyborg Soldier Cyborg 005/G. Junior Banner of the Stars II Samson Touch: Cross Road – Kaze no Yukue Fujimura Lupin III: Alcatraz Connection Andy 2002 Asobotto Senki Goku GK Ghost in the Shell: Stand Alone Complex Batou Shin Megami Tensei Devil Children: Light & Dark Watcher Tenchi Muyo! GXP Azusa Masaki Jurai Patapata Hikōsen no Bōken Christophe Balzac Piano Seiji Nomura Petite Princess Yucie Rockwell Full Metal Panic! Lt. Cmdr. Andrei Kalinin 2003 Ashita no Nadja Jose Rodriguez Astro Boy: Mighty Atom Pluto Wolf's Rain Cold Fireman L/R: Licensed by Royalty Mister Requiem from the Darkness Choujirou The Galaxy Railways Schwanhelt Bulge Stratos 4 Inquisitor Full Metal Panic? Fumoffu Andrei Kalinin PoPoLoCrois Pietro, Gamigami One Piece Blackbeard 2004 Agatha Christie no Meitantei Poirot to Marple Cedric CrackenthorpeSuper Robot Monkey Team Hyperforce Go! Skeleton King SD Gundam Force Professor Gerbera Kyo kara Maoh! Gwendal von Voltaire Kurau: Phantom Memory Ayaka's Father Ghost in the Shell: Stand Alone Complex 2nd GIG Batou Cromartie High School Narrator in Episode 25 Samurai Champloo Okuru Burn-Up Scramble Master Black Jack Black Jack Massugu ni Ikō Minamoto Monster Milan Kolasch Phoenix Patriarch 2005 Bleach Shunsui Kyōraku Full Metal Panic! The Second Raid Andrei Kalinin The Snow Queen The Devil/The Avatar of the Wind 2006 Ginga Tetsudo Monogatari: Eien e no Bunkiten Schwanhelt Bulge Sgt. Frog Garuru Coyote Ragtime Show Mister Onegai My Melody Kuromi's Father, Teacher, Mr. Goat Kenichi: The Mightiest Disciple Ishinsai Ogata The Melancholy of Haruhi Suzumiya Arakawa A Spirit of The Sun Yang Black Jack 21 Black Jack Ray the Animation B.J 2007 El Cazador de la Bruja Sanchez Emily of New Moon Mr. Carpenter Gintama Saizou The Skull Man Sirks 05 Devil May Cry Morrison Neuro: Supernatural Detective Masakage Shirota 2008 Itazura na Kiss Sudou-senpai Ultraviolet: Code 044 Sakuza Kyo kara Maoh! 3rd Series Gwendal Gegege no Kitarō Goro Minamoto Slayers Revolution Wizer Naruto: Shippuuden Chiriku 2009 Canaan Sham Kawa no Hikari Glen Guin Saga Cameron Jungle Emperor – Yuki ga Mirai wo Kaeru Ooyama Kenzou Valkyria Chronicles Radi Jaeger Hajime no Ippo: New Challenger Bryan Hawk 2010 Durarara!! Shingen Kishitani Transformers Animated Lockdown Baka to Test to Shokanju Sōichi Nishimura 2011 Baka to Test to Shōkanjū Ni! Sōichi Nishimura Fate/Zero Rider/Iskandar Blade Blade 2012 Space Brothers Brian Jay Thermae Romae Hadrianus Toriko Ryoutei Hunter × Hunter (2011) Uvogin Fate/Zero 2 Rider/Iskandar JoJo's Bizarre Adventure Wamuu 2013 Star Blazers 2199 General Elk Domel JoJo's Bizarre Adventure Wamuu Toriko Livebearer Yondemasu yo, Azazel-san. Z Marukome 2014 In Search of the Lost Future Sakunoshin Honjō Space Dandy Toaster Sengoku Musou SP: Sanada no Shou Honda Tadakatsu Hajime no Ippo Rising Brian Hawk Hunter × Hunter (2011) Mizaistom Nana Majin Bone Higashio 2015 Blood Blockade Battlefront Blitz T. Abrams Sengoku Musou Honda Tadakatsu Durarara!!×2 Shō Shingen Kishitani Nintama Rantaro Yamada Denzo The Rolling Girls Dandy Young Black Jack Narrator 2016 Ace Attorney Go Karuma Mob Psycho 100 Ekubo My Hero Academia Zen Shigaraki Berserk Skull Knight Magic Kyun! Renaissance Principal March Comes in Like a Lion Raidō Fujimoto 2017 Chain Chronicle ~The Light of Haecceitas~ Black King Alice to Zouroku Zouroku Kashimura My Hero Academia Season 2 Zen Shigaraki 2018 Space Battleship Tiramisu Narrator Golden Kamuy Tetsuzō Nihei Laid-Back Camp Narrator, Rin's Grandfather How Not to Summon a Demon LordChester Ray Galford Shinya! Tensai Bakabon Black Jack My Hero Academia Season 3 Zen Shigaraki Mr. Tonegawa: Middle Management Blues Masayasu Honda Karakuri Circus Zenji Saiga 2019 Dororo Dr. Jukai Mob Psycho 100 II Ekubo Carole & Tuesday Gus Goldman Are You Lost? Jōichi Onishima The Case Files of Lord El-Melloi II Iskandar Episode 13 Vinland Saga Thorkell Star Twinkle PreCure Yoichi Hoshina African Office Worker Lion Super Shiro Shiro (Hero) Beastars Gouhin My Hero Academia Season 4 Zen ShigarakiPsycho-Pass 3Tenma Todoroki 2020 Kakushigoto Kairi Imashigata Ghost in the Shell: SAC 2045 Batou Baki Yujiro Hanma The Misfit of Demon King Academy Jerga Akudama Drive Capital Punishment Division's Instructor Boruto: Naruto Next Generations Amado 2021 I-Chu: Halfway Through the Idol Principal Bear My Hero Academia Season 5 Zen Shigaraki Cestvs: The Roman Fighter Narrator Ore, Tsushima Tsushima How Not to Summon a Demon Lord ΩChester Ray Galford Kimi to Fit Boxing Bernardo Lupin the 3rd Part 6 Daisuke Jigen My Senpai Is Annoying Ojii-chan 2022 Girls' Frontline Kryuger The Genius Prince's Guide to Raising a Nation Out of Debt Gruer Summer Time Rendering Seidō Hishigata My Hero Academia Season 6 Zen Shigaraki Spy × Family WISE Director Episode 5 Credits Mamekichi Mameko NEET no Nichijō Narrator Mob Psycho 100 III Ekubo Bleach: Thousand-Year Blood War Shunsui Kyōraku Kingdom Gai Mou 2023 Bungo Stray Dogs 4 Genichirō Fukuchi Revenger Kanō Gerald Vinland Saga Season 2 Thorkell My Home Hero Kubo Yohane the Parhelion: Sunshine in the Mirror Mari's father Episode 5 YouTuNya Narrator The Great Cleric Brod Malevolent Spirits: Mononogatari Kushige Shangri-La Frontier Vysache Four Knights of the Apocalypse Varghese 2024 Ishura Hargent the Silencer Pon no Michi Chonbo The Fable Takeshi Ebihara My Hero Academia Season 7 Zen Shigaraki Dungeon People Brans Kinnikuman: Perfect Origin Arc Strong the Budo Wistoria: Wand and Sword Logwell Let This Grieving Soul Retire! Gark Welter Ranma ½ Sōun Tendō Tono to Inu Tono 2025 From Bureaucrat to Villainess: Dad's Been Reincarnated! Leopold Auvergne Headhunted to Another World: From Salaryman to Big Four! Demon King Lazarus Abel My Hero Academia: Final Season Zen Shigaraki Gachiakuta Bundus 2026 Digimon Beatbreak Chairman Wong The Darwin Incident Rivera Feyerabend The Daughter of the Demon Lord Is Too Kind! Ahriman Hell Mode Zenoff Akane-banashi Issho Arakawa Rooster Fighter Keizan The Ghost in the Shell Colonel Malles The Vermilion Mask Mask of the Warrior God 2027 Shin Oishinbo Yūzan Kaibara TBA Heir to a Monstermancer Ao
OVA Year Title Role Notes 1989 Angel Cop Hacker 1991 3×3 Eyes Benares Mobile Suit Gundam 0083: Stardust Memory Anavel Gato 1992 Babel II Yomi 1992 Matchless Raijin-Oh Gokudo 1993 Black Jack: Clinical Chart Black Jack 1994 Kizuna: Bonds of Love Masanori Araki 1995 Tenchi Muyo! Ryo-Ohki Azusa Jurai Fire Emblem: Mystery of the Emblem King Cornelius、Voice-over 1996 Birdy the Mighty Gomez Blue Seed 2 Daitetsu Kunikida Magic User's Club Minowa Minoru 1997 Agent Aika Gozo Aida Magic Knight Rayearth Windom Night Warriors: Darkstalkers' Revenge Demitri Maximoff 1998 Tekken: The Motion Picture Jack 2/Narrator 2000 Amon: Apocalypse of Devilman Amon 2001 Rurouni Kenshin: Reflection Kurogasa 2005 Saint Seiya Hades 2007 Fist of the North Star: Legend of Yuria Souther 2009 Dogs: Bullets & Carnage Mihai 2010 Tales of Symphonia OVA Regal Bryant 2015 Mobile Suit Gundam: The Origin Narrator
ONA Year Title Role Notes 2016 Pokémon Generations Giovanni 2021 The Heike Story Benkei 2022 Spriggan Steve H. Foster 2023 Make My Day Commander Bark Cute Executive Officer R Mugaku Hamaoka Lupin the 3rd vs. Cat's Eye Daisuke Jigen Good Night World Shirō Akabane / Kojirō Arima Onimusha Musashi Miyamoto 2024 The Grimm Variations Brown Episode 2: "Little Red Riding Hood"
Cinematic animation