Astro

Astro is a young street urchin turned prince and is the main protagonist of Sensei no Bulge series. It is eventually revealed by Black that Astro is the true prince of Industria, Bulge. He was originally a poor young man living in the slums of Industria's capital city, but after a fateful encounter with Prince Bulge of Industria, he received his title and status and had since become the new prince of the entire planet.