This list includes 38 Anime characters that start with O, from “O-Ren Ishii” to “Ozymandias”. They span genres and decades, from main protagonists to memorable supporting figures. Fans use this as a quick reference for voice actors, series research, or trivia.
Anime characters that start with O are named characters appearing in anime whose romanized names begin with the letter O. Some use historical or mythic references, as seen with characters like “Ozymandias” drawing on ancient imagery.
Below you’ll find the table with Series and Voice actor.
Series: Shows the anime title and year so you can find the character’s original appearance and series context.
Voice actor: Includes the primary Japanese actor and notable English dub actor, helping you track performances and credits.
Anime characters that start with O
| Character | Series (original title / year) | Role | Voice actors (JP; EN if known) |
|---|---|---|---|
| Obito Uchiha | Naruto Shippuden (ナルト 疾風伝, 2007) | Primary antagonist and anti-hero | JP: Naoya Uchida; EN: Todd Haberkorn |
| Ochaco Uraraka | My Hero Academia (僕のヒーローアカデミア, 2016) | Main supporting protagonist | JP: Ayane Sakura; EN: Luci Christian |
| Oda Nobunaga | Drifters (ドリフターズ, 2016) | Supporting protagonist | JP: Naoya Uchida; EN: Robert McCollum |
| Oikawa Tooru | Haikyuu!! (ハイキュー!!, 2014) | Major rival and antagonist | JP: Daisuke Namikawa; EN: Chris Patton |
| Okabe Rintarou | Steins;Gate (シュタインズ・ゲート, 2011) | Protagonist | JP: Mamoru Miyano; EN: J. Michael Tatum |
| Okita Sougo | Gintama (銀魂, 2006) | Major supporting character | JP: Kenichi Suzumura; EN: Clint Bickham |
| Okuyasu Nijimura | JoJo’s Bizarre Adventure: Diamond is Unbreakable (2016) | Major supporting protagonist | JP: Wataru Takagi; EN: Jalen K. Cassell |
| Oma Shu | Guilty Crown (ギルティクラウン, 2011) | Protagonist | JP: Yuki Kaji; EN: Austin Tindle |
| Orochimaru | Naruto (ナルト, 2002) | Primary antagonist | JP: Kujira; EN: Steve Blum |
| Osamu Dazai | Bungo Stray Dogs (文豪ストレイドッグス, 2016) | Major protagonist | JP: Mamoru Miyano; EN: Kaiji Tang |
| Oscar François de Jarjayes | The Rose of Versailles (ベルサイユのばら, 1979) | Protagonist | JP: Reiko Tajima; EN: Lani Minella |
| Oshino Shinobu | Bakemonogatari (化物語, 2009) | Major supporting character | JP: Maaya Sakamoto; EN: Cristina Vee |
| Ozen | Made in Abyss (メイドインアビス, 2017) | Supporting character and mentor | JP: Sayaka Ohara; EN: Luci Christian |
| Olivier Mira Armstrong | Fullmetal Alchemist: Brotherhood (2009) | Major supporting character | JP: Yoko Soumi; EN: Stephanie Young |
| Onizuka Eikichi | Great Teacher Onizuka (GTO, 1999) | Protagonist | JP: Wataru Takagi; EN: Steve Blum |
| Onoda Sakamichi | Yowamushi Pedal (弱虫ペダル, 2013) | Protagonist | JP: Daiki Yamashita; EN: Johnny Yong Bosch |
| Orihara Izaya | Durarara!! (デュラララ!!, 2010) | Primary antagonist | JP: Hiroshi Kamiya; EN: Johnny Yong Bosch |
| Orihime Inoue | Bleach (ブリーチ, 2004) | Main supporting protagonist | JP: Yuki Matsuoka; EN: Stephanie Sheh |
| Otonashi Yuzuru | Angel Beats! (2010) | Protagonist | JP: Hiroshi Kamiya; EN: Blake Shepard |
| O-Tama | One Piece (ワンピース, 1999) | Supporting character | JP: Megumi Han; EN: Sarah Wiedenheft |
| Otsutsuki Kaguya | Naruto Shippuden (ナルト 疾風伝, 2007) | Final antagonist | JP: Mami Koyama; EN: Cissy Jones |
| Orga Itsuka | Mobile Suit Gundam: Iron-Blooded Orphans (2015) | Co-protagonist and leader | JP: Yoshimasa Hosoya; EN: Johnny Yong Bosch |
| Ogata Hyakunosuke | Golden Kamuy (ゴールデンカムイ, 2018) | Major antagonist/supporting character | JP: Kenjiro Tsuda; EN: Ian Sinclair |
| Orphen | Sorcerous Stabber Orphen (魔術士オーフェン, 1998) | Protagonist | JP: Showtaro Morikubo; EN: David Matranga |
| Osaki Nana | NANA (ナナ, 2006) | Co-protagonist | JP: Romi Park; EN: Rebecca Shoichet |
| Ozymandias | Fate/Grand Order – Divine Realm of the Round Table: Camelot (2020) | Antagonist and Servant | JP: Takehito Koyasu; EN: Kellen Goff |
| Ogino Chihiro | Spirited Away (千と千尋の神隠し, 2001) | Protagonist | JP: Rumi Hiiragi; EN: Daveigh Chase |
| O-Ren Ishii | Kill Bill: Vol. 1 (2003) | Antagonist | JP: Ai Maeda; EN: Lucy Liu |
| Okajima Taeko | Only Yesterday (おもひでぽろぽろ, 1991) | Protagonist | JP: Miki Imai; EN: Daisy Ridley |
| Osana Najimi | Komi Can’t Communicate (古見さんは、コミュ症です。, 2021) | Major supporting character | JP: Rie Murakawa; EN: Anairis Quiñones |
| Oz Vessalius | Pandora Hearts (パンドラハーツ, 2009) | Protagonist | JP: Junko Minagawa; EN: Bryce Papenbrook |
| Owari Akane | Danganronpa 3: The End of Hope’s Peak High School (2016) | Supporting character | JP: Romi Park; EN: Wendee Lee |
| Oshino Meme | Bakemonogatari (化物語, 2009) | Key supporting character | JP: Takahiro Sakurai; EN: Keith Silverstein |
| Ozpin | RWBY (2013) | Supporting character and mentor | JP: Kazuhiko Inoue; EN: Shannon McCormick |
| Otohime | One Piece (ワンピース, 1999) | Recurring character (flashback) | JP: Michiko Neya; EN: Amanda Lee |
| Otosaka Yuu | Charlotte (シャーロット, 2015) | Protagonist | JP: Koki Uchiyama; EN: Ray Chase |
| Ogami Ichiro | Sakura Wars (サクラ大戦, 1997) | Protagonist | JP: Akio Suyama; EN: Dave Wittenberg |
| Okami Ryoko | Okami-san and Her Seven Companions (2010) | Protagonist | JP: Shizuka Ito; EN: Brina Palencia |
Descriptions
Obito Uchiha
A former Konoha ninja believed dead who orchestrates a world war under the alias Tobi. His tragic past is central to the series’ latter half.
Ochaco Uraraka
A hero-in-training at U.A. High School with the Quirk “Zero Gravity”. Her hero name is Uravity, and she is a close friend of Izuku Midoriya.
Oda Nobunaga
A famous Japanese warlord summoned to another world to fight as a “Drifter.” He serves as the group’s brilliant and ruthless military strategist.
Oikawa Tooru
The highly skilled and charismatic captain and setter for the Aoba Johsai High volleyball team. He is a major rival to Kageyama and the Karasuno team.
Okabe Rintarou
A self-proclaimed “mad scientist” who accidentally discovers a method of sending messages to the past, leading to unforeseen and dangerous consequences.
Okita Sougo
The 1st Division Captain of the Shinsengumi police force. He is a prodigal swordsman with a sadistic personality and a fierce loyalty to his commander.
Okuyasu Nijimura
A hot-headed but extremely loyal Stand user and the best friend of protagonist Josuke Higashikata. His Stand, The Hand, can erase space itself.
Oma Shu
A high school student who gains the “Power of the King,” an ability that allows him to draw out weapons called Voids from people’s hearts.
Orochimaru
One of Konoha’s three Legendary Sannin, a brilliant but twisted ninja obsessed with achieving immortality through forbidden human experimentation.
Osamu Dazai
A brilliant, eccentric, and suicidal member of the Armed Detective Agency with the ability to nullify any other power he touches.
Oscar François de Jarjayes
A noblewoman raised as a man to become the commander of Marie Antoinette’s Royal Guard during the years leading up to the French Revolution.
Oshino Shinobu
A 500-year-old legendary vampire who lost her powers and now exists as an 8-year-old girl living in the shadow of protagonist Koyomi Araragi.
Ozen
A legendary White Whistle delver known as “Ozen the Immovable.” She is the intimidating master of the Seeker Camp in the Abyss’s second layer.
Olivier Mira Armstrong
The formidable Major General in charge of Fort Briggs, known as the “Northern Wall.” She is the elder sister of Alex Louis Armstrong.
Onizuka Eikichi
A 22-year-old former biker gang leader who becomes a teacher to a class of delinquents, using his own unique and forceful methods to reach them.
Onoda Sakamichi
A cheerful otaku who discovers his incredible natural talent for cycling while trying to revive his school’s anime club, becoming a star road racer.
Orihara Izaya
A cunning and manipulative information broker who adores humanity but loves to put people in chaotic situations just to observe their reactions.
Orihime Inoue
A kindhearted classmate of Ichigo Kurosaki who develops a unique spiritual power called Shun Shun Rikka, allowing her to reject and undo events.
Otonashi Yuzuru
A boy who awakens in a high school in the afterlife with no memories. He joins a group of students rebelling against God while trying to recall his past.
O-Tama
A young girl from the Wano Country who can create special dango from her cheek that can tame animals. The “O-” is a common honorific in Wano.
Otsutsuki Kaguya
The ancient matriarch of the Ōtsutsuki clan and the original progenitor of chakra on Earth, who becomes the final foe for Team 7 to overcome.
Orga Itsuka
The charismatic leader of the Tekkadan mercenary group, a “family” of former child soldiers fighting to secure a future for themselves on Mars.
Ogata Hyakunosuke
An enigmatic and ruthless ex-soldier and an incredibly skilled sniper. He acts as a wildcard in the race to find the hidden Ainu gold.
Orphen
A powerful but cynical sorcerer who dropped out of a prestigious magic school. He searches for a way to restore his childhood friend, Azalie.
Osaki Nana
The ambitious lead vocalist for the punk band Black Stones (Blast). She moves to Tokyo to pursue fame and becomes roommates with Nana Komatsu.
Ozymandias
The great Pharaoh of Egypt, Ramesses II, summoned as a Rider-class Servant. He is an arrogant but powerful king who rules his own faction in the Camelot Singularity.
Ogino Chihiro
A 10-year-old girl who gets trapped in a world of spirits. To save her parents, she must work at a bathhouse under the new name “Sen.”
O-Ren Ishii
The queen of the Tokyo underworld and a former member of the Deadly Viper Assassination Squad. Her origin story is told in a distinct anime sequence.
Okajima Taeko
A 27-year-old single woman from Tokyo who travels to the countryside for the summer, leading her to reminisce about her childhood in 1966.
Osana Najimi
An impossibly popular and sociable student who is a childhood friend to nearly everyone. Their gender is intentionally kept ambiguous.
Oz Vessalius
A young heir cast into the Abyss prison on his coming-of-age day. He makes a contract with a “Chain” named Alice to escape and uncover his “sin.”
Owari Akane
The former Ultimate Gymnast from Hope’s Peak Academy. She is energetic and food-obsessed, but fiercely protective of her friends.
Oshino Meme
An eccentric, middle-aged man who specializes in dealing with oddities and apparitions, offering guidance to Koyomi Araragi for a price.
Ozpin
The enigmatic Headmaster of Beacon Academy. He guides the students, particularly Team RWBY, in their fight against the forces of Grimm.
Otohime
The benevolent queen of the Ryugu Kingdom on Fish-Man Island and an advocate for peace and cooperation between fish-men and humans.
Otosaka Yuu
A cynical high school student who can possess people for five seconds. He is forced to join a student council of other ability-users.
Ogami Ichiro
A newly-graduated Ensign assigned to lead the Imperial Combat Revue’s Flower Division, a secret all-female unit that pilots steam-powered armor.
Okami Ryoko
A fierce high school student who is a member of the Otogi Bank, a club that solves students’ problems in exchange for favors. Known as Ōkami-san.