Dio Eraclea is a central character in the anime series 'Last Exile'. He is a member of the Guild, an elite group that governs the world from behind the scenes. Dio is known for his playful and carefree demeanor, which often masks his underlying intelligence and cunning. Despite his affiliation with the Guild, he forms a close bond with the protagonists, Claus and Lavie, and becomes an important ally. Dio's character arc is marked by his struggle for personal freedom and identity, as he seeks to understand the constraints placed upon him by his lineage and the Guild's rigid structure.