Nestor serves as the first mate of the spaceship Odysseus in the anime Ulysses 31. He is a close and trusted friend of Captain Ulysses, and his calm, temperate nature earns him the respect of the entire crew. Nestor is a courageous man whose extensive experience provides him with thorough knowledge of all space routes leading back to Earth, making him an invaluable navigator and advisor during the mission to find the Kingdom of Hades. His role in the story is to support Ulysses and the younger crew members, offering steady guidance and practical expertise in the face of the many dangers posed by the gods of Olympus. While his backstory is not detailed in the series, his motivation stems from loyalty to his captain and a shared determination to return home. Nestor's primary notable ability is his mastery of interstellar navigation, derived from years of travel across the galaxy.