Okiayu Ryoutarou roles (anime)
Ryoutarou has done the following roles in anime.
| 3x3 Eyes [1991-1992] | masked man |
| Akikan! [2009] | Otoya Hidehiko |
| Android Ana Maico 2010 | Matsuo Densuke |
| Angel Links | Cyrus |
| Ao no Futsumashi (Blue Exorcist) [2011] | Igor Neuhaus |
| Arad Senki Slap Up Party [2009] | Irbek |
| Asagiri no Miko [2002] | Ayatachi Michimune |
| Asagiri no Miko [2002] | Kusugi |
| Ashita he no Free Kick {Episode 39,40,41} | Betteger |
| Bleach | Kuchiki Byakuya |
| Boku ha Tomodachi ga Sukunai Next [2013] | Kashiwazaki Pegasus |
| Burn Up W [1996] | Yuji |
| Bush Baby | Tauma |
| Buso Renkin | Mita |
| Captain Tsubasa: Road To 2002 [2001-2002] | announcer |
| Chrono Trigger OVA | villager B |
| Clannad [2007-2008] | Furukawa Akio |
| Clannad After Story [2008-2009] | Furukawa Akio |
| D.N.Angel | Dark Maoshi |
| Dark Cat [debut] | Kagezaki Hyoi |
| Date A Live IV [2022] | Isaac Ray Pelhem Westcott |
| Date A Live V [2024] | Isaac Ray Pelhem Westcott |
| Denshin Mamotte Shugogetten | Nomura Takashi |
| Di Gi Charat | Kimura Takurou |
| Di Gi Charat Christmas Special 2000 | Kimura Takurou |
| Di Gi Charat Natsuyasumi Special | Kimura Takurou |
| Di Gi Charat Summer Special 2000 | Kimura Takurou |
| El Hazard | Jinnai Katsuhiko |
| Elementalors | villain |
| Excel Saga | Watanabe |
| Excel Saga | team member A |
| Excel Saga | Dominick |
| Fire Emblem | Abel |
| Fruits Basket [2001] | Souma Shigure |
| Full Metal Alchemist (Hagane no Renkinjutsushi) | Scar |
| Gekigangar 3 | Johnny |
| Gekigangar 3 | Roukottsu |
| Gekigangar 3 | Golchie |
| Gekigangar 3 | Balman |
| Gensou Maden Saiyuuki [2000] {Movie} | Dougan |
| Ginga Sengoku Gun'yuuden Rai | ? |
| Gokudou-kun Man'yuuki | Sanzou |
| Gravitation [2000-2001] | K |
| Gulliver Boy | Gekkou |
| Gundam Wing | Treize Kushrenada |
| Harukanaru toki no naka de -Hachiyoushou- [2004] | Akram |
| Haunted Junction | Akamanto Kamen |
| Heartcatch PreCure [2010] | Ban Kenji |
| Hellsing | Enrico Salvaletti |
| High School Aurabuster | Izumi Kisara |
| Hurricane Polymar OAV | Takeshi |
| Idol Boueitai Hummingbird {'94} | Katou |
| Idol Memories [2016] | Hayami Ren |
| Iron Leaguer | Mach Windy |
| J-Decker The Brave Police | MacLane |
| J-Decker The Brave Police | Mudorar |
| Jigoku Sensei Nuubee | Nuubee |
| Juubei-chan | Koinosuke |
| Juubei-chan II | Odago Koinosuke |
| Kaitou Saint Tail {Episode 14} | John |
| Kakugo no Susume (Apocalypse Zero) | ? |
| Kamikaze Kaitou Jeanne [1999-2000] {Episode 8} | Kimura Takumi |
| Kasho no Tsuki | Kouryuu |
| Keppeki Danshi Aoyama-kun [2017] | Aoyama-kun |
| Kidou Senkan Nadesico [1996-1997] | Akatsuki Nagare |
| Kidou Senshi Gundam Seed [2002] | Andy Bartfield (Bultfeld) |
| Kimera | Jay |
| The King of Burning Desert Gandalla [1998] {Episode 6,13-14,16} | Robert |
| Kinnikuman II Sei | Kevin Mask |
| Kinnikuman II Sei | Puripuri Man |
| Kizuna 1 | Samejima Ranmaru |
| Kizuna 2 | Samejima Ranmaru |
| Koko ha Greenwood | Dormmate C |
| Koko ha Greenwood | Vice-president |
| Kon'yaku haki sareta Reijou wo Hirotta Ore ga Ikenaikoto wo Oshiekomu [2023] | Gosetsu |
| Legend of Galactic Heroes | Emile von Zelle |
| Legendary Gambler Tetsuya | Tetsuya |
| Love Hina [2000] | Sakata Kentarou |
| Macross II | Ingus |
| Magic Knight Rayearth | Inova |
| Mahouka Koukou no Rettousei [2014] | Kokonoe Yakumo |
| Majutsushi Orphen (Sorcerous Stabber Orphen) | Hartia |
| Makai Tenshou | Amakusa Shiro |
| Mamotte Shugogetten [1999] | Takashi |
| Marmalade Boy | Matsuura Yuu |
| Maze Bakunetsu Jikuu | Gorgeous |
| Melody of Oblivion | Global Yamaneko |
| Might Gaine | Guard Diver |
| Might Gaine | Changer Loose |
| Nanako Kaitai Shinsho | Alan Mizuki |
| Nanatoshi Monogatari [1994] | Nicolas Bloom |
| Naruto | Aoi |
| Nekogami Yaoyorozu [2011] | Tsukuyomi |
| Ningen Kakumei [1995] | Yamamoto Shinichi |
| Offside | Kumaya Gorou |
| Orokana Tenshi ha Akuma to Odoru [2024] | Zwei |
| Please Save My Earth | Nishikiori Issei |
| Princess Minerva | Linealter |
| Recca no Honoo | Kurei |
| Record of Lodoss War {Episode 6} | villager |
| Rikei ga Koi ni Ochitanode Shoumei sitemita [2020] | Ikeda kyouju |
| Rikei ga Koi ni Ochitanode Shoumei sitemita Heart [2022] | Ikeda kyouju |
| Romeo X Juliet [2007] | Tibolt |
| Rou Kyuu Bu SS [2013] | Minato Shinobu |
| RUN=DIM | Ken Miller |
| Sailor Moon {Supers} | Tigers Eye |
| Sailor Moon {Episode 2} | Yuuji |
| Sailor Moon {Episode 81} | Achiral |
| Sailor Moon {Episode 108} | George |
| Sasaki to P-chan [2024] | Akutsu |
| Seiken no Blacksmith [2009] | Siegfried |
| Senkaiden Houshin Engi | Youzen |
| Shin Megami Tensei Devi Chil (Debichiru) [2000] | Daimaou Lucifer |
| Shinseiki GPX Cyber Formula | Franz Heinel |
| Shoujo Kakumei Utena {episodes 19,30} | Kazami Tatsuya |
| Shuumatsu no Izetta [2016] | Helman |
| Sister Princess [2001] | Akio |
| Slam Dunk | Mitsui Hisashi |
| Sol Bianca (1999) | Void |
| Spectral Force | Chiffon |
| Super Robot Taisen OG Divine Wars | Randis F Branstien |
| Teito Monogatari | Fortune Teller |
| Tekkaman Blade II | Darbit |
| Tennis no Oujisama | Tezuka Kunimitsu |
| Tokyo Ravens [2013] | Tsuchimikado Yakou |
| Toriko [2011-2013] | Toriko |
| Touch Cross Road: Kaze no Yukue | announcer |
| Tsuyoshi Shikkari Shinasai | Tatsuya |
| Ushio to Tora | Gaminsama |
| Weiss kreuz | Brad Crawford |
| Wizardry OVA | Lifestealer 2 |
| Yuu + Gi + Ou [Yuugiou] | Honda Hiroto |