Speed-o'-Sound Sonic

Speed-o'-Sound Sonic (音速のソニック, Onsoku no Sonikku) is a villain in the series, first appearing as a bodyguard hired by Zeniru. He occasionally takes the role of an anti-hero. He views Saitama as his eternal rival.

Appearance
Sonic is a slim young man with a feminine face, long black hair tied up in a topknot, and large grey eyes. A noticeable feature of his are the purple marks underneath his eyes. He usually appears wearing a tight black bodysuit highlighted by metal plating on his shins, arms, shoulders, chest, and waist, as well as a long purple scarf. After the fight with Genos, Sonic loses his topknot and is left with loose shortened hair.

Personality
Despite his normally calm appearance, Sonic loves fighting strong opponents as shown by when he gets a "child-like smile" on his face when he first meets Saitama and has two of his attacks blocked, earlier calling this his "bad habit." He seems to be very quick to act as he attacks Saitama on their first meeting without letting him explain the situation. He is persistent, even when he realizes that the opponent is much stronger than he is. When Sonic recognizes an opponent as his rival, he does whatever he can to initiate the battle, such as causing massive property damage and endangering the surrounding citizens in order to get Saitama to fight him. He also seems to have no qualms with killing as shown when he kills Hammerhead's gang and even goes as far as to take pride in the fact that he never lets a single person live.

He also seems to be rather disdainful of heroes. When he meets Genos, he tells him that heroes can neither win against a truly strong opponent nor can they truly protect anything. However, unlike Garou, he does not go out of his way to attack heroes.

Abilities and Powers
As a ninja, Sonic is adept at hiding his presence. He has displayed proficiency with multiple weapons. He was mentioned to be a S-class criminal.

Physical Abilities
Immense Speed & Reflexes: Sonic's main ability is his extreme speed. He has been shown to be capable of dodging rocks and trees thrown at him with incredible force. How Sonic obtained his ability is unknown, but so far the only person shown to be able to keep up with and surpass his speed is Saitama.

Enhanced Strength: Despite his thin appearance, Sonic's power doesn't only lie in his speed. He also has superhuman levels of strength, being capable of dislocating a man's shoulder simply by walking into him.

Enhanced Durability: In addition to his speed and strength, he is capable of taking large amounts of punishment as shown when Sonic fought the Sea King.

Fighting Style
Ninjutsu Master: As an experienced ninja, it can be assumed that Sonic is a master of ninjutsu and has knowledge of various deadly techniques. He displayed multiple techniques involving his incredible speed and weapons.


 * Full Frontal Attack: Sonic takes a low stance and rushes forward at speeds that make him impossible to be seen. The effect of this attack is not known because it was interrupted by Hammerhead.


 * Sonic attacks Sea King anime.pngWind Blade Kick (風刃脚, Fujin Kyaku): Sonic throws himself at his foe and does a front flip, during which he throws his foot out to kick his opponent using the momentum of the flip.


 * Hail of Carnage: Sonic leaps around throwing his exploding shuriken at cars, buildings and people to cause massive amounts of panic and mayhem.


 * Four Shadows Burial: Sonic creates four identical afterimages through a special movement technique.


 * Scattered Flash Slash: Used in a combo with the four shadows burial, the four afterimages surround (and possibly attack) the target at the same time with the ninjatō.


 * Ten Shadows Burial: Same with four shadows burial, but with ten identical afterimages in total.

Equipment
Ninja Weaponry: Sonic carries a variety of ninja based weaponry with him at all times.


 * Ninjato: Sonic carries a sword with a straight blade, a black scabbard and hilt. It is extremely sharp, capable of cutting through bone.


 * Kunai: He carries an undetermined number of kunai with which he has shown exceptional ability.


 * Exploding Shuriken: Sonic carries with him shuriken that explode upon impact.


 * Smokescreen Shuriken: Sonic carries shuriken that leave a trail of smoke. They are used to conceal his position.

Webcomic and Manga Differences
Sonic appeared from behind a tree in the webcomic, but from the shadows in the manga.

Anime and Manga Differences
Episode 9
 * Sonic runs off to get his weapons, only to be seen by Saitama while he was tagging along with License-less Rider. Once he got his battle outfit on, he was too late to kill Sea King, as Sonic isn't aware that Saitama already finished Sea King first.

Episode 11
 * Sonic is seen hearing a radio about the invasion on A-City, thrilled for a battle against the invaders, as it mean also having a chance to find his rival, Saitama again for a rematch.

Episode 12
 * After the alien invasion is over, leaving the trace of their technology parts from the ship, Sonic investigate the metal wall that was punched by Saitama to get out of the wrecked ship.

Major Battles

 * Sonic vs Paradise Group
 * Sonic vs Saitama (F-City)
 * Sonic vs Demolition John and Prisoners
 * Sonic vs Sea King
 * Sonic vs Genos
 * Sonic vs Saitama (Z-City)
 * Sonic vs Saitama (K-City)

Quotes

 * (To Genos) "You bunch with your little game of 'Let's pretend to fight for justice' can't win against a truly strong opponent nor can you protect anything."


 * (Referring to Saitama) "Whenever I face you, I cannot picture myself winning for some reason... Unless I defeat you and wipe off this thought I cannot move on."

Trivia

 * Sonic is ranked 3rd in the character popularity poll.


 * Sonic's prisoner number was 4188.


 * Because of Sonic's feminine appearance, many fans thought of him as female.


 * Sonic is voiced by Kaji Yuki in the anime, a seiyuu being famous for his voice of Eren Yeager (Shingeki no Kyojin), Ayato Kirishima (Tokyo Ghoul), Yukine (Noragami), Kozume Kenma (Haikyuu!!), etc.


 * ONE has said that Sonic with a weapon would have defeated the Sea King pre-rain form.


 * A running gag for Sonic is that with every confrontation with Saitama, he is beaten in a humiliating way. First time was being punched in the groin, second time was being karate chopped behind on the head slamming into the concrete making a mark where he landed, a third time gets his ultimate technique destroyed by one of Saitama's Super Move Serious Series, and fourth time (in a special chapter) Saitama elbowed (possibly accidentally) him in the groin while his vision was impaired. (So far according to the Manga and not the Webcomic)


 * Sonic's black lines under his eyes are a reference to an american football player and are inspired by Eyeshield 21, another manga by Yusuke Murata.
 * Sonic shares similarities with Flashy Flash, including feminine features, body scars, a redundant title involving speed, and color scheme similar to their alignment (Flash being mainly white as a Superhero and Sonic being black as a villain).


 * They also share a technique, namely the Wind Blade Kick technique with. While the former used it first against Saitama, the latter used it when battling Garou. This implies that the two may have a connection.
 * One Q&A section of the original web comic even asked if there was a relation between the two but was never actually answered.
 * Sonic's name and attributes may very well be a reference to Sonic the Hedgehog.