Jio's childhood friend, Jin, protected Jio when he was bullied by other kids. On the day Jin told Jio they were friends, he witnessed his parents being killed by Jio in Satan form. This event filled Jin with intense hatred towards Jio, and he sought to kill him. Jin later became an O.P.T. for hire and encountered Jio during a mission. During their fight, Satan revealed the truth about his parents' death to Jin. Realizing what really happened, Jin forgave Jio and saved his life from a fire he had started. Jin's O-Part is Ashura (B rank), with the ability to control Flame. Jin developed two special attacks fueled by his hatred of Jio: Black Flame Pillar and Black Flame Dragon. Later, Jin returned to participate in the Olympia tournament, where it was revealed that he no longer hated Jio and instead focused on saving him from Satan. The black flames of Ashura, once fueled by hatred, were replaced by more powerful blue flames.
jin
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Ball
Main
A strange kid with dreadlocks who loves round things and joins up with Ruby and Jio after the events in Entotsu City, where he lived with his parents and younger sister. At first, Ball loved to pretend to be an OPT and loved to show off. He was greatly su...
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Bianchina Cross
Main
Age: Start: 12, Post-Rock bird 17, Post-Armageddon ??Height: 160 cmWeight: 47 kilosO-Part: Justice (5 rings)Former commander of the Stea Republic SS Rank O-Part ship Shin (God). Cross lived alone with his younger sister, Lilly, after their parents left wh...
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Crescent Ruby
Main
* Age : Start: 14,rock bird 15, Post-Rock bird 19, Post-Armageddon ?? * Height : 155 cm (5'1") * Weight : 40 kilos (88 pounds) * O-Part: Jade PendantA young treasure hunting girl who is researching the mysterious, legendary O-Part. She carries an...
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Freed Jio
Main
* Age : Start: 12, Rock Bird 13, Post-Rock Bird 18, Post-Armageddon ?? * Height: 145 cm (4'9") * Weight: 35 kilos (77pounds) * O-Parts: Zero, Shin Zero, Zero R, Satan(O-part on his left hand)The main protagonist of this story, Jio is a boy with g...
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Kirin
Main
A white-haired, pickle-loving hermit who is easily bored and lived on the outskirts of Entotsu City, famed for his knowledge about O-Parts (and repairing them) and his genius as a swordsman. His brother Kujaku claimed that no one has ever been able to wou...
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Amidaba
Supporting
Nicknamed "Seven-Colored" Amidaba, former Stea Republic Army Officer. She is a skilled O.P.T. and friend of Jack Crescent and Kirin. She meets Ruby in the dungeons of Entotsu City and aids in their escape. She also helps out in the fight against Mekisis a...
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Anna
Supporting
Mrs. Anna was Petrovs maid who took care of the apartment that Petrov and the group of children stayed in. Her "knedlky" (Czech dumplings) was their favorite dish. She is later found murdered when Grimmer returns to the apartment, killed by Johan ...
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Baku
Supporting
Baku (バク) was a member of the ANBU, working directly under the supervision of the Second Hokage. He was one of the ANBU ordered to watch the Uchiha clan to keep them from rebelling again. Baku is likely not his real name, but a codename.Peeking from behin...
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Barisu
Supporting
When Cross was still a part of Stea, Barisu acted as commander whenever Cross was away. Although he acted respectful, he evidently despised him and though he would be better suited to commanding Shin. During the Roc-Bird arc, he even fired Shin's soul-abs...