Race: Human
Age: 25
Location: Z-City
Abilities: Superhuman Speed, Agility
Weapons: Ninja equipment
Occupation: Bodyguard (former), Villain
Affiliation: Zeniru (former)
Sonic is best known as a villain obsessed with defeating Saitama, whom he views as his eternal rival. He first appeared working as a bodyguard for Zeniru before fully committing to villainy.
Physically, he's lean and somewhat delicate-looking, but deceptively strong and blindingly fast. His most distinctive features are the purple marks tattooed under each eye and his black hair styled in a topknot. He typically wears a tight black ninja outfit with metal plating on the shins, forearms, shoulders, and chest, paired with a flowing purple scarf. He's rarely seen without his ninjato, kunai, and throwing stars—basically, he's completely decked out in ninja gear.
Personality-wise, Sonic comes across as calm and composed, but fans often note his weird obsession with fighting powerful opponents. When he first encounters Saitama, he breaks into what he calls a "child-like smile"—his own self-aware "bad habit." He's also impulsive; he attacked Saitama immediately on their first meeting without bothering to hear what he had to say.
After getting completely stomped by Saitama in their initial fight, Sonic became laser-focused on finding a way to finally beat him. That loss basically consumed him, turning what was once casual mercenary work into an all-consuming vendetta.
Content compiled by AnimeList.moe from publicly available sources.