Characters in One-Punch Man, Vol. 31

Saitama

Also in One-Punch Man, Vol. 1, One-Punch Man, Vol. 2, One-Punch Man, Vol. 3, One-Punch Man, Vol. 4, One-Punch Man, Vol. 6, One-Punch Man, Vol. 7, One-Punch Man, Vol. 8, One-Punch Man, Vol. 9, One-Punch Man, Vol. 10, One-Punch Man, Vol. 11

Zombieman

Metal Bat

Also in One-Punch Man, Vol. 10, One-Punch Man, Vol. 11, One-Punch Man, Vol. 32