Little is known about Sonic’s past. What is known is that he lived in the same ninja village as Flashy Flash, Gale Wind and Hellfire Flame and was the sole survivor of his class during the 44th graduating class called “The End” because of the incident caused by Flashy Flash
Sonic first appears as a bodyguard for a rich man named Zeniru, defending him from a group calling themselves the Paradisers. Sonic appears before the group and their leader, Hammerhead, as they are approaching Zeniru’s building. After appearing before the group and claiming that he has never let a single person live and quickly dispatches all of the group, except the leader who is able block Sonic’s attack in time. After avoiding and subsequently mocking Hammerheads attacks, Sonic hits him in the back of the head with a kunai. Assuming that Hammerhead has been defeated, he calls in report his success, but when he turns back he sees that Hammerhead is gone
Hero Association Saga Rumored Monster Arc SaitamaBitesSword Saitama bites Sonic sword Saitama is running about, worrying about losing his heroes license when Sonic throws a kunai at him and he catches it. Sonic begins to threaten Saitama, but Saitama interrupts him, saying that they could do this another time and begins to walk away. This angers Sonic who then draws his sword and rushes at Saitama attack, but Saitama quickly turns around and bites Sonic’s sword in half. Sonic stands still for a second, confused by what had just happened until Saitama threatens punch him, causing Sonic shudder from the menacing aura
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At that point the two of them are distracted by Tanktop Tiger who has shown up to investigate the person who’d been running around town and starts threaten Saitama, until Sonic throws several exploding shuriken at Tanktop Tiger which causes him pass out. Observing that Saitama is a hero, Sonic declares that he will create a situation that will force Saitama to fight him, then jumps back and throws several more exploding shuriken which Saitama is prepared block, but instead fly off in different directions, hitting the surrounding buildings and causing a lot of mayhem. Sonic continues do this until Saitama jumps up behind him and chops him in the back of the head which throws him the ground hard enough that it leaves an impression of his gleeful face in the pavement.
Sea Monster Arc Sonic attacks Sea King anime Sonic attacks Deep Sea King Sonic escapes from prison when Puri-puri Prisoner broke out to save J-City from the Deep Sea King Sonic watches the fight between Puri-puri Prisoner and the Deep Sea King and notices that Puri-puri Prisoner was acting tough and is struggling and thought that he can take out both of them with ease. After the Deep Sea King defeats Puri-puri Prisoner, he annoyed Sonic which made him want fight the monster. Deep Sea King attempts to punch Sonic who easily dodges, causing him attack Sonic several more times, with the ninja dodging the attacks and eventually landing a kick on Deep Sea King’s face. After landing the kick a snake-like creature appears in front of Sonic and attempts bite him, but only manages to rip his shirt. The creature is actually a long Moray that is coming out of Deep Sea King’s mouth.
Tounge cut Sonic shuts Deep Sea King’s mouth Deep Sea King goes attack with his Moray again, but Sonic dodges it and smashes Deep Sea King’s mouth shut, causing him bite off the Moray. Deep Sea King then attempts use a chain of punches on Sonic, who easily dodges and jumps at Deep Sea King, attacks him and lands on the roof of a nearby building. However when he looks back, the Deep Sea King is laughing. Deep Sea King the launches himself at Sonic and crashes into the roof of the building, with Sonic barely being able dodge in time. After dodging away from Deep Sea King’s attack, Sonic jumps off to a different building, but before he has a chance to do anything, Deep Sea King shows up. He then reveals that after he’d left the sea his body had shriveled up, but the rain enabled him toreturn his true form.
Sonic manages to escape, leaving behind his prison outfit in the Deep Sea King’s grip. Sonic then appears on a nearby roof naked, vowing that the next time the two would meet would be their last, after which he leaves. Then he meets Genos on the way who asked him who he was. Instead, he warned him about the Deep Sea King and leaves. Sonic was later spotted by Saitama, who at the time was tagging along with Mumen Rider. Sonic returns later on with his full ninja outfit, prepared to fight the Deep Sea King once more, but is too late, as Saitama had already eliminated the monster
Sonic was listening to the radio in his hiding place, about the destruction of City A, when he is polishing his sword. After the alien invasion ended, leaving traces of their technology parts off the ship, Sonic investigated the metal wall punched by Saitama to get out of the wrecked ship.
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