Pepe is introduced when Weed arrives to the South of Japan. He is being attacked by the dog Kazuma and other troops of Yukimura, but GB saves him. He is taken back by the monkey clan during an assult on Weed’s pack. He tries to return to Weed, but is stopped by Gozaru. He escapes and follows Weed to Yukimura’s hideout. Here he is put in a small hole with some puppies who tries to kill him. He is saved by Jerome and Weed, but shortly after taken by the baboon general, Shougun’s soldiers. He is brought to Shougun as food and only escapes by hidding in a small hole in Shougun’s hideout. He is saved by Weed and tries to steal Shougun’s axe during the final fight. He doesn’t succeed and gets carried to safety by Weed.

Pepe is the son of the leader of the monkeys, who got killed by Yukimura's pack. When Shougun was slain, Ishizaru promised Weed that he will make sure Pepe will become a strong trustful leader like him.