Read more about Speed-o'-Sound Sonic at: Wikipedia

Official Site: Viz Media

The Japanese manga series One-Punch Man contains a number of fictional characters created by One and illustrated by Yusuke Murata. The series follows a superhero named Saitama and his disciple Genos who join the Hero Association so they can be recognized as such when they fight various monsters and villains. The Hero Association ranks all of its members by a Class and a ranking within that class. Characters listed are ones noted by the author in the manga profiles, ones that were highlighted in the anime character list, and ones that recur over several story arcs.

The title character, Saitama (サイタマ), is a bald-headed 25-year-old man who is bored of fighting because he is effortlessly able to defeat enemies with a single punch. He lives in an apartment in City Z. Three years prior to the start of the series, when he still had hair, Saitama was job hunting when he defeated the powerful supervillain that attempted to kill a child with his buttocks on his chin. Saitama says he became a hero "for the fun of it". His abilities mainly consist of physical abilities magnified to an immeasurable degree: speed is the true power of Saitama, with strength, stamina, and durability being mere side powers. He attributes this to a daily training regimen (100 push ups, 100 sit ups, 100 squats, a 10 km run, eating healthy food, and not using the air conditioner or heater to reinforce his mental fortitude). Early in the series, he picks up a disciple and roommate .

Though he had broken all the physical records in the Hero entrance exam by huge margins, Saitama enters the Hero Association with a score of 71, giving him one of the lowest ranks in the Hero Association. This is due to his miserable performance on the mental exam. He soon goes up the ranks by performing many deeds, although many of his efforts are not recognized because of collateral damage or higher-tiered superheroes receiving more credit. These include defeating the raging ninja supervillain/assassin known as , and destroying a meteor similar to the meteor that made the dinosaurs go extinct with a single punch. As of the current arc of the web comic by ONE, he is A-Class rank 39. He does not mind letting others have the recognition though, as demonstrated in his actions following the fight against the . In the ' story arc, he is unfazed by the telekinesis of a powerful esper, further displaying his resistance. This arc was also one of the only times he has used his "serious punch", defeating the world-conquering leader of the aliens, Lord Boros, before he could use his Roaring Star Cannon attack. Through various circumstances, he forms friendships with Mumen Rider, Bang, King, Genos, and Blizzard. His superhero name in the association is .

Saitama is voiced by Makoto Furukawa in the Japanese version and by Max Mittelman in the English dub.

Speed-o'-Sound Sonic has not been a contender in any CBUB matches.