Onsoku no Sonic

Onsoku no Sonic is a slender, fast-moving ninja characterized by his topknot and purple eye markings. Originally acting as Zeniru’s hired bodyguard, he maintains a calm demeanor until combat provides him with a childlike thrill against powerful opponents. He is driven by an obsession to defeat Saitama, whom he views as his ultimate rival. Using a ninjato and various ninja tools, he trains constantly to overcome his previous defeat and prove his martial superiority.