Stratos is one of the Heroic Warriors. He has the power of flight and energy projection, and is the leader of a race of birdpeople who inhabit the airborne city of Avion, high in the Mystic Mountains.
The Bird People are close allies of He-Man, and Stratos is one of his most trusted warriors. Besides the power of flight and his aerial acrobatic skills, Stratos is also a handy spy for the Heroic Warriors due to his sharp, bird-like eyes.
No origin was ever given for Stratos in either of the two cartoons, but a comic produced by MV Creatons to accompany the 2002 series revealed that his entire race was flightless until a magical staff gave them wings and the power of flight. The people of Avion use rocket packs for increased speed and navigation.