30 Best Anime Characters That Start with an O [with Images]

Anime characters appear in all shapes and sizes. They also appear under a variety of names. Some anime characters have first and last names, some have nicknames, some have… well, they are always known as something. In that aspect, it is important to remember all of these names and that is why we have decided to bring you this list. This list is going to contain a list of anime characters that start with the letter O. They will be sorted alphabetically by the names they are known best, whether it is their first name, last name, or their nicknames.

Professor Oak (Pokémon)

He is a scientist specializing in Pokémon. He is nicknamed the Pokémon Professor because of his incomparable knowledge of these creatures. He is the one who gives Pokémon to novice trainers around the age of 10.

In addition to a first Pokémon, he provides them with a Pokédex, which is used to identify all Pokémon, as well as Poké balls. He is also the grandfather of Gary, Ash’s rival. He gives them their first Pokémon, Squirtle, and Pikachu respectively.

Obito Uchiha (Naruto)

During his time as a Konoha ninja, Obito’s abilities were average at best, struggling to match his Academy comrades. Determined to improve, he trained for several months and eventually became a chūnin. Madara saw great potential in Obito and therefore chose him as his disciple. Madara’s hopes proved right, as, under her tutelage, Obito greatly enhanced his late-blooming abilities, becoming a copycat of Madara in his prime.

At the age of 14, Obito issued a challenge to the Fourth Hokage and nearly destroyed Konoha. As an adult, he defeated two of the most talented Root ninjas, killed Konan, and held his own in one-on-one combat with Naruto, Killer B, Guy, and Kakashi.

As Shinju’s jinchūriki, Obito’s power exceeded even Hashirama Senju’s, he was able to effortlessly battle three powerful Hokage, overwhelm both Naruto Uzumaki and Sasuke Uchiha, as well as the entire army forces. Shinobi, with minimal effort.

Odelschwanck, Nelliel Tu (Bleach)

Nelliel Tu Odelschwanck or Nell is the old Tercera Espada. She is a former Adjuchas. Her mask is at the level of her forehead and has a visible crack. Her hair is green and her eyes are brown. When she first appears, she has the appearance of a young child who becomes attached to Ichigo, whom she calls “Itsugo”.

In fact, Nell is a “young” woman with green hair, a big breast, and red marks on the cheekbones of her face. Nell and his companions are exceptions among the Hollows: far from the image of ruthless bullies that most give, they appear loyal and sympathetic, with a rather childish personality and playful the majority of the time.

Odion (Yu-Gi-Oh!)

Odion Ishtar is the adopted son of the Ishtar family, who lacked a male heir; he is found by Isis and Marik’s mother when he was a newborn and raised to become a tomb guardian and succeed his father. After Marik’s birth, his task will be to take care of him. During Battle City he enters the tournament by pretending to be Marik; he gets to the quarter-finals where, however, he has to contend with Joey. Odion literally dominates the duel but is eventually forced by the real Marik to use the Ra card in order to nullify Joey’s suspicions of Odion’s true identity.

Oikawa, Yukio (Digimon Adventure 02)

Yukio Oikawa is one of the humans aware of Digimon’s existence. As a child during the 1970s, Oikawa was extremely lonely and only had Cody’s father, Hiroki Hida, as his only friend. The two learn of the existence of the Digital World. Oikawa and Hiroki promise each other to reach the Digital World together.

However, Hiroki dies a few years later, and Oikawa feels betrayed; Oikawa is also one of the many witnesses of the events in Tokyo on August 3, 1999 when the DigiDestined left for the Digital World. At this time of grief and weakness, Oikawa allows Myotismon’s soul to possess his body, in return for a visit to the Digital World. However, Oikawa is manipulated without scruple by Myotismon, and he has created two of his most loyal minions: Arukenimon and Mummymon.

Okkutsu, Yuta (Jujutsu Kaisen)

The protagonist of volume 0 of the manga entitled Tokyo Metropolitan Curse Technical School, is a work that serves as a prequel to the latter. Yuta was initially a cursed victim of a high-ranking plague, he was haunted by the spirit of his childhood friend, Rika Orimoto.

Satoru Gojo took charge of his case and enrolled him in the Tokyo Curse School, where he befriended Maki Zen’in, Toge Inumaki, and Panda. After training with Gojo and the other highs, Yuta learned to control his occult energy and became a skilled swordsman.

Even after lifting Rika’s curse, Yuta retains his special power, so much so that he can beat Suguru Geto, and Gojo has stated that Yuta has the potential to defeat him. Yuta’s great power comes from the fact that he is a descendant of one of the three great exorcist clans and this is the reason he cursed Rika when he refused his death as a child.

Okumura, Rin (Blue Exorcist)

The protagonist, fifteen years old in the story, is the son of Satan and was born to a human woman. He is also the heir to the powers of Satan. These were sealed at birth in the enchanted sword Kurikara, or Komaken, by Mephisto. It allowed him to live a normal life.

Rin became aware of his true identity after Kurikara could no longer contain the blue flames he inherited from his progenitor, and these events led to the death of his guardian, father, and exorcist Fujimoto Shiro at the very hands of Satan. , who at the same time attempted to send Rin into the demon realm.

Okumura, Yukio (Blue Exorcist)

Younger twin of Rin, in the moments in which he argues with his brother he is called “four-eyed full of moles”. When it was discovered that the human woman who became pregnant with Satan would give birth to twins, it was thought that the demonic powers would be divided equally between the two unborn children.

However, due to his weak constitution, Yukio did not inherit any power from Satan, coming into the world as a human and instead having Rin inherit all supernatural powers. Despite this, Yukio received the “touch of the demon” (Masho) at birth from his brother, which allows him to see demons for as long as he can remember. The boy has been secretly training to become an Exorcist since he was seven, in order to protect Rin (as he was lovingly imposed on him by Shiro).

While the two brothers are in their freshman year at the True Cross Academy, Yukio is already a renowned instructor at the Exorcist Apprentice School in his capacity as the Anti-Demon Pharmacology teacher in Rin’s class: it is often claimed that Yukio is a genius, having already acquired the title of Meister in “Dragoon” and “Doctor”, while most people aim to become Meister by specializing in only one class.

Ōmaeda, Marechiyo (Bleach)

Marechiyo Ōmaeda is the Vice Captain of the 2nd Division of the Gotei 13 and the Commander of the Guard Corps, Special Forces Detachment. He comes from a noble family of Soul Society, and has a rather haughty attitude, even sometimes a little too greedy. He loves picking his nose. He greatly admires his captain who scares him a little, however.

During the shikai, his zanpakutō takes the form of a flail (in the form of a spiked ball), which he releases by saying “Crush”. His abilities remain unknown until the Arrancar attack on the false Karakura, as he was defeated before he could even use them. His zanpakutō appears to be heavy enough to crush anyone attacked by it.

During the Battle of the Fake Karakura, he also shows that he is worthy of the 2nd Division, by performing a very fast shunpō. The special episodes depict him as a character convinced of his beauty and proud to belong to a wealthy family of high nobility.

Ōmori, Yakumo / Jason (Tokyo Ghoul)

Yamori is a very powerful and bloodthirsty ghoul with a scaly-type kagune: nicknamed the Jason of the 13th, he is the most powerful ghoul in the 13th district of the capital. He is sadly famous for committing butchery by massacring his opponents during his clashes. Her love for torture stems from her trauma at the ghoul prison, where a psychopathic inspector tortured her for fun.

Oolong (Dragon Ball)

Oolong is a talking pig that can transform itself into whatever it wants but for a maximum duration of five minutes and keep its strength unchanged. The character is based on Binyao, co-star of Toriyama’s Dragon Boy manga, and the pig Zhu Bajie, who appears in the story Journey to the West. Temperamentally Olong is cynical, cowardly, crafty, cowardly, and pervert: his favorite hobbies are collecting women’s underwear and spying on women to see them naked.

Ophanimon (Digimon Frontier)

Ophanimon is an Angel Digimon. As one of the “Celestial Digimon”, it is a holy, mother-like being that conveys the loving and merciful side of God. It is the last form of feminine Angel Digimon.

It was responsible for banishing the previous angel species Cho-Hakkaimon from Heaven for an unspecified crime. However, it is also believed that Laylamon, who fell from Heaven and became known as the “Goddess of Darkness”, was originally an Ophanimon herself.

Opie, Quilge (Bleach)

Quilge Opie is the Stertitter with the designation J and is also the commander of the Hunting Army. He defeats Harribels Fracciónes and Ayon but is defeated by Ichigo. However, Quilge gets back up and delays Ichigo’s arrival in Soul Society by imprisoning him in a Reishi prison. Before he can kill Urahara, Orihime, and Chad, he is killed by Grimmjow. His Quincy: Vollständig is called Biskiel.

Orimoto, Zoe (Digimon Frontier)

Izumi (Zoe) Orimoto is one of six DigiDestined from Digimon Frontier who are given the ability to transform into Digimon. Zoe, enthusiastic from the beginning to be able to take part in an unexpected adventure, at the beginning of the series she receives the Spirit of Wind. She is in fifth grade and the Legendary Warrior whose Spirit she has is AncientKazemon.

Zoe is the only female of Frontier’s DigiDestined group, but that doesn’t seem to weigh on her. In fact the girl, since her return to Japan after a two-year stay in England, has always suffered from problems in being around people, unable to make stable friendships due to her too much character. strong and some disappointments suffered by girls who had deluded her on the possibility of finally building a real relationship.

Orochimaru (Naruto)

Orochimaru possesses a complex personality; however, he was most often described as “twisted” by a large number of people, including Tsunade. Jiraiya speculated that the death of his parents when he was young, along with the horror he felt when Tsunade lost Nawaki and the tears she later shed when she lost Dan, imply that Orochimaru began to despise the fragility of human life and how it affected those still living, which led him to desire immortality.

Osaki, Nana (Nana)

Singer and lyricist for Blast. She was Ren’s girlfriend until he joined Trapnest. She is still very marked by this separation but is still in love with him. She meets Nana Komatsu on the train that takes them to Tokyo and by the force of chance, they find themselves living together in apartment No 707.

Abandoned by her mother during her childhood, Nana lives only for her dream of living. of his music and does not wish to lead a quiet and tidy little life. Endowed with a strong character which can sometimes prove to be excessive, she is afraid of losing people around her and is therefore particularly possessive of them.

Otokawa, Nakime (Demon Slayer)

Although Nakime’s Demon Blood Art was not as martial as the other Upper Moons, her ability was just as strong, if not stronger than her comrades in terms of utility and strength, for she alone could control and manipulate an entire fortress at will as if it were her limbs. Nakime has the ability to manipulate and control a seemingly endless interdimensional fortress while playing Biwa.

Ōtoribashi, Rōjūrō (Bleach)

Rōjūrō Otoribashi, also known as Rose, is a man with long blonde hair. He was promoted to Captain of the Third Division one year before Kisuke Urahara, 111 years ago. Ten years later, when the blackouts on the Rukongai reach Captain Kensei Muguruma and his Lieutenant Mashiro Kuna, Rose is sent along with Shinji, Love, Lisa, and Hachigen to investigate the incident, which turned them all into Visoreds.

Ōtsustuki, Asura (Naruto)

Initially, Asura did not possess many abilities, however, over the years, he proved to have a talent that was honed through hard work and dedication, allowing him to awaken and use his own inherited power, his father’s body, willpower, and physical energy with which his Chakra was able to flourish in order to rival his brother.

Ōtsustuki, Hagoromo (Naruto)

The Rikudô Sennin was the creator of all the ninja techniques. He has mastered all the techniques, including that of the Mangekyô Sharingan and that of the Six Paths of Pain, and has also mastered the five natures of chakra. And besides, his reserve of chakra was immense, even infinite. He respected the tailed beasts he had created as well as the people who raised him to the rank of a god, showing that in his time, he was respected by everyone.

Ōtsustuki, Hamura (Naruto)

Hamura was one of the most powerful people in history, which he demonstrated by being able to defeat the Ten-Tails alone along with his brother Hagoromo. He possessed a Shakujō and a Sword and was presumably highly skilled in handling both weapons. He also inherited the powerful Chakra from his mother.

Ōtsustuki, Indra (Naruto)

From an early age, Indra was recognized as a prodigy even by his own father from whom he inherited his powerful Chakra, Dōjutsu, talent, strong genes, and spiritual energy. In the anime, his aptitude was so great that all of Hagoromo’s followers had little doubt that Indra would become the Ninshū’s successor.

Ōtsustuki, Isshiki (Naruto)

Isshiki Otsutsuki was a member of the main family of the Otsutsuki Clan. He used Jigen as a vessel until his eventual resurrection and, under his identity, acted as one of the “Inners” and the leader of the Kara organization.

Ōtsustuki, Kaguya (Naruto)

Kaguya Ōtsutsuki is a member of the main family of the Ōtsutsuki Clan who is the central underlying antagonist of the Naruto series. Unlike her relatives, Kaguya decided to keep the world to herself after eating a fruit from the Divine Tree in that world, becoming a part of the tree while using it and Rinnesharigan to subject the world to the Infinite Tsukuyomi to end everything.

Ōtsustuki, Kinshiki (Naruto)

Kinshiki Otsutsuki was a member of the main family of the Otsutsuki Clan, who served as the father figure and dutiful subordinate of Momoshiki Otsutsuki. Kinshiki was an extraordinarily powerful being who, along with Momoshiki, and Urashiki in the anime, and from the preparations, Kaguya made in preparation for her arrival, Sasuke speculated that they were a greater threat than her.

Ōtsustuki, Momoshiki (Naruto)

Momoshiki Otsutsuki was a member of the main family of the Otsutsuki Clan, who traveled in search of Chakra in order to gain power and longevity. After his death at the hands of Boruto Uzumaki, Momoshiki chose him as his vessel by granting him Karma.

Ōtsustuki, Toneri (Naruto)

Toneri is a very powerful shinobi, being able to control the Power Vessel to knock the Moon out of its orbit. His abilities allowed him to fight on par with Naruto the Kurama Jinchūriki. He also could control a statue that he was able to fight against Kurama. On the other hand, Toneri has great medical knowledge to the point of being able to transplant eyes and treat serious injuries.

Ōtsustuki, Urashiki (Naruto)

Urashiki was an extraordinarily powerful being, who along with Momoshiki and Kinshiki, were considered a greater threat than Kaguya. He was able to hold his own against two Kage level opponents simultaneously. As an Otsutsuki, Urashiki possessed extremely powerful chakra, as well as the ability to levitate and survive in space.

Ox-King (Dragon Ball Z)

At first, he was shown to have a barbaric, brutish, and ruthless personality, capable of harming anyone who invades his territory or harms his daughter, with whom he is very overprotective. However, he trained her to be an expert in combat based on the style of the Turtle School. As he progresses into the series he becomes a more friendly, cheerful, and affectionate character, pampering and pleasing his daughter in her desire to marry.

Ozora, Tsubasa (Captain Tsubasa)

He is the protagonist of the series and aspires to win the world championship with Japan. Over the course of his career he has played in virtually all roles: at the beginning of the series he was a center forward, then changed his role to that of attacking midfielder. He has also played as a defender in some games.