Speed-o'-Sound Sonic

Next one in the list of the fastest anime characters is Speed-o'-Sound Sonic. Speed-o'-Sound Sonic, or just Sonic, is a frequent villain and occasional anti-hero. He first debuted as Zeniru's bodyguard. He was a member of the Ninja Village's 44th Graduation Class, called "The End." Sonic is also Saitama's proclaimed eternal rival.

Sonic enjoys fighting despite his typically calm manner. He is motivated by desire for blood against weak opponents, the thrill of battle, his supremacy over strong opponents and competition against a powerful opponent he can't beat. Sonic has little concern for human life other than his own, and he takes satisfaction in never letting an opponent live.

Sonic's key talents are his incredible speed and ninja skills, which allow him to surpass and hit his opponents before they can respond. His quickness and mobility make him an effective competitor who poses a serious threat to his opponents.

When confronted by the Paradisers, he was capable of moving faster than they could react, decapitating every member of the organization except their leader Hammerhead in a matter of seconds. Sonic takes a low stance and runs forward at speeds that make him unrecognizable. The outcome of this strike is unknown because it was disrupted by Hammerhead.

Anime: One-Punch Man
Watch here: https://www.crunchyroll.com/series/G63K98PZ6/one-punch-man