音速のソニック, Speed of Sound, Speed-o'-Sound
Race: Human Alias: Sonic Location: ZCity Abilities: Superhuman Speed and Agility Weapons: Ninja equipment Occupation: Bodyguard former now a villain Affiliation: Mr. Monier former Sonic Onkun no Soniku is a villain in the series first appearing as a bodyguard hired by Mr. Monier. He views Saitama as his eternal rival. Appearance: Sonic is a thin slightly effeminate man who despite his slender build is extremely strong and fast. He has black medium length hair that is tied up in a topknot. One noticeable feature is that he has two black 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 red scarf. He is shown later in black street clothes. He always carries a ninjato and other ninja equipment such as kunai and ninja stars. Personality: Sonic is a villain who despite his normally calm appearance loves fighting strong opponents as shown by when he gets a childlike 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.