| Saitama is a hero who only became a hero for fun. After three years of “special” training, though, he's become so strong that he's practically invincible. In fact, he's too strong — even his mightiest opponents are taken out with a single punch, and it turns out that being devastatingly powerful is actually kind of a bore. With his passion for being a hero lost along with his hair, yet still faced with new enemies every day, how much longer can he keep it going? |
| Name | Character | Episodes |
|---|---|---|
| Kaito Ishikawa | Genos (voice) | 25 |
| Makoto Furukawa | Saitama (voice) | 25 |
| Saori Hayami | Hellish Blizzard (voice) | 24 |
| Aoi Yuuki | Terrible Tornado (voice) | 24 |
| Yuichi Nakamura | License-less Rider (voice) | 24 |
| Takahiro Sakurai | Zombieman (voice) | 12 |
| Minami Takayama | Child Emperor (voice) | 12 |
| Katsuyuki Konishi | Tank-Top Master (voice) | 12 |
| Mamoru Miyano | Handsome Sweet Mask (voice) | 12 |
| Satoshi Hino | Superalloy Blackluster (voice) | 12 |
| Yuki Kaji | Speed of Sound Sonic (voice) | 12 |
| Daisuke Namikawa | Pig God (voice) | 12 |
| Tessyo Genda | Metal Knight (voice) | 12 |
| Yuji Ueda | Watchdog Man (voice) | 12 |
| Masaya Onosaka | Pri-Pri-Prisoner (voice) | 12 |
| Hikaru Midorikawa | Garou (voice) | 12 |
| Miyuki Sawashiro | Mosquito Girl (voice) | 1 |
| Daisuke Namikawa | Dr. Genus (voice) | 1 |
| Ryusei Nakao | Vaccine Man (voice) | 1 |