Speed-o'-Sound Sonic

音速のソニック

Abilities: Superhuman Speed, Agility
Weapons: Ninja equipment
Sonic is a villain who first appeared as a bodyguard hired by Zeniru. He regards Saitama as his eternal rival.
Sonic is a thin, somewhat effeminate man who, despite his slender build, is extremely strong and fast. He has medium-length black hair tied up in a topknot. A noticeable feature is the two purple marks under his eyes, one under each. He first appears wearing a tight black outfit highlighted by metal plating on the shins, forearms, shoulders, and chest, as well as a long purple scarf. He is later shown in black street clothes. He always carries a ninjato and other ninja equipment such as kunai and ninja stars.
Sonic is a villain who, despite his normally calm appearance, loves fighting strong opponents, as shown when he gets a "child-like smile" on his face upon first meeting Saitama and having two of his attacks blocked, having earlier called 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.
After being defeated by Saitama for the first time (episode 4) while working as a bodyguard for Zeniru, he devotes his time to finding a way to defeat him.