Demon is a leader of a pack of 200 dogs.
Years ago, Demon challenged Gin to a fight, because he had killed one of Gin's messengers. Gin only brought one dog with him to face Demon's pack. Demon took this as an insult and charged at Gin. Gin dodged the Pitbull's bites, threw him in the air and he landed heavily on the ground. The blow killed Demon instantly. After that, no one in the pack dared to attack Gin or his companion. This fight was told in a flashback by Jerome as he had witnessed the fight when he was 2 years old.
- His name is spelled Demon in Ginga Densetsu Weed Meishōbu Retsuden and in Finnish translation. Though in the Comics One translation his name is spelled Damon