Character
Garo (in Flashbacks, Posing As Masked Wolfman), Hellish Blizzard, Mohican (Introduction), Genos, Gigakikan, Flashy Flash, Spiderino, Sourface (Also in Flashback), King, Centichoro (Introduction), Red Muff, Saitama, Darkness Blade, Garo, Centisenpai (Introduction), Piko, Pineapple (Introduction), Mumen Rider, Metal Knight, Tornado, Atomic Samurai, Child Emperor, Great Philosopher, Sitch, Gameberos, Golden Ball (Introduction), Amai Mask, Demon Cyborg (Genos), Centisenpai, Silverfang, Armored Assistant Manager, Lafreshidon, Charanko, Lafreshidon (Introduction), Metal Bat, Tank-Top Master, One-Punch Man, Stinger, Blizzard, Spring Mustachio (Introduction)