User blog comment:Nobody700/S-Class heroes and Humanity/@comment-5038468-20160317045114

Well they're not really S-Class "heroes", Sonic is a S-Class criminal. In the martial arts tournament, Suiryu and Bakusan both are hyped up to be S-Class and they're more or less youngsters of the martial arts world. So there are possibly dozens of S-Class humans we haven't seen.