Mario is a Cavern Dragon Slayer, who was raised by his Dragon, Earthus, until she disappeared with the rest of the dragons when he was 12. He later joined a dark guild of criminals and stayed until we was arrested by the leader of the Protectors guild, Bri. Now, he is a reformed criminal in his guild, Divinus Magia. He's a bit grumpy and easily annoyed, especially by David. But he has a softer, brotherly side which gained him the nicknames "Big bro" from some of the other members (mostly Kit).