The sole surviving Crown Prince of the destroyed planet Fleed. He escapes the Vegan invasion, hides on Earth under the alias Daisuke Umon, and pilots the giant robot Grendizer to defend Earth. He initially clashes with Koji Kabuto but they become allies. After reuniting with his sister Maria and witnessing Princess Rubina's death, he leads the final assault against King Vega before returning to rebuild Fleed.
Duke is the son of Genzo who was brainwashed to become the enemy
Duke's mother who helps him fight against the Vega Empire
Close ally and friend who helps Duke fight against the Vega Empire
Duke's romantic interest who supports him in his battles
Primary antagonist who constantly battles against Duke
Vega Empire officer who sometimes helps Duke
Explore the full interactive character relationship map of UFO Robot Grendizer