Absolute Tartarus is a major antagonist in the Ultra series, first appearing in Ultra Galaxy Fight. He is a powerful member of the Absolutian race, known for his intelligence, strategic mind, and mastery of manipulation rather than brute force alone. Tartarus serves as a key mastermind behind many conflicts, often intervening across time and dimensions to advance the Absolutian agenda. His role in the series is that of a central villain and planner, driving large-scale threats against the Ultras and their allies.