John Stewart's origin is quite an interesting one. He was living his life as a Marine, having his own set of skills and experiences. Then, out of the blue, he got the opportunity to be a Green Lantern. The Green Lantern ring chose him. His origin story involves not just getting the power but also his growth. He had to face challenges from both within the Corps and from external enemies. His origin story is intertwined with his development as a character, his relationships with other Green Lanterns, and his struggle to protect the universe, which makes it a great and complex origin story in the DC Comics world.