Madmall is a Fifth Generation Dragon Slayer and a member of Diabolos, a guild composed of dragon eaters who hunt and consume dragons to gain power. As a Fifth Generation Dragon Slayer, he is able to use Dragon Force, a heightened state that greatly amplifies his magical abilities. He appears as an antagonist early in Fairy Tail: 100 Years Quest, engaging in battle against Natsu Dragneel and his companions during their encounter with the water dragon god Mercphobia. During this fight, he fights alongside his fellow Diabolos member Kiria. Later in the story, Madmall is seen again with Kiria and Skullion, another member of the guild, aboard a ship. His motivation aligns with Diabolos’s goal of hunting powerful dragons and proving the guild’s strength, often putting him in direct opposition to Fairy Tail. His role is that of a recurring enemy within the Diabolos ranks, though he does not undergo significant personal development or change over the course of the narrative. His key relationships are with his guildmates, particularly Kiria and Skullion. His notable ability is his Dragon Slayer magic as a Fifth Generation Dragon Eater, which allows him to consume dragon magic and enter Dragon Force for combat.