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| Sonic is a villain, first appearing as a bodyguard hired by Zeniru. He views Saitama as his eternal rival. 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 |
Speed-o'-Sound Sonic Voice Actors
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| Erik Kimerer (EN) |
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| Yuuki Kaji (JP) |
The English voice actor for Speed-o'-Sound Sonic (One Punch Man) is Erik Kimerer and the original Japanese voice actor is Yuuki Kaji.