Ernest is the alpha male of a pack of direwolves. He is very intelligent, as he learned how to exploit the weakness of the Arctodus "Short-Faced Bear" (attacking the nose and face) by seeing Sengoku Akira do it. He also helped Sengoku when he was injured by leading Sengoku's friends to him.

He is easily distinguished from his pack by his sheer size, black fur, and the scars on his muzzle. He was given his name by Sengoku.