Ecolo G (エコロ爺, Ekoro Jī) is a C-Class Rank 179 professional hero for the Hero Association.


His appearance is stereotypical of a caveman with leopard print clothes and a very hairy body.


Human Monster SagaEdit

Monster Raid ArcEdit

Ecolo G is one of the heroes defeated by Eyesight.[1] He was captured and poisened by the monster, but was saved by the combined effort of Child Emperor with his robot the Underdog Man No. 22 and Pig God.[2]

Webcomic notice The following section contains Webcomic spoilers. You have been warned, manga-only readers.

Unnamed SagaEdit

Fall of the Hero Association ArcEdit

Ecolo G, Dynamite Man, Reclusamurai and Magic Trick Man work together to defeat the Forest Tribe and while they succeed in defeating many of them, they fail to defeat the Forest King and are nearly killed before Genos shows up.

Appearances of Other MediaEdit



Ecolo G is one of the contestants of the Hero Costume Contest.[3]

Abilities and PowersEdit

As a lower ranked C-Class hero, it is assumed he isn't a very strong fighter.


Stone Axe: Fitting his caveman-like appearance, Ecolo G wields a simple prehistoric-looking stone axe.


  • The G stands for Grandpa.
  • His original name is a play on words of the term "ecology".


  1. One-Punch Man Manga; Chapter 61, page 26
  2. One-Punch Man Manga; Chapter 66, page 13-22
  3. One-Punch Man Manga; Taste