Today's blog post is about Speed-O-Sound Sonic from the show One Punch Man. Speed-O-Sound Sonic is one of the antagonists in the show. He is very fast, and he uses ninja weapons while fighting. When he is fighting a strong enemy, he gets a big smile, which he calls his "bad habit". Other than that, he usually tries to keep a calm appearance. He doesn't seem to like super heroes very much, and he has declared himself to be Saitama's eternal rival. He was also formerly employed as the bodyguard for Zeniru. Speed-O-Sound Sonic also doesn't seem to mind killing people, which is shown when he tells Hammerhead and his gang that he doesn't let a single person live.