He is a small, pale-skinned, human young man with wild blue hair and a fierce expression befitting his personality. As a commoner he wore simple and tattered clothing which consisted of a blue jumpsuit with yellow buttons, a beige-colored jacket that was torn in some areas, a pair of red work gloves and a red gas mask which he often wore as a hat. As a royal prince he now wears all manner of refined high-class clothing befitting royalty, however he most commonly wears a small gold crown atop his head.
Astro is a courageous young man of great determination and ambition who cares deeply about his friends and adoptive family. Having grown up without a family, he considers having a family to be very important and that families should get along no matter how unlikable one of their members are. He values his adoptive family more than anything and cannot stand to see orphans abandoned on the street and adopts every orphaned child he comes across and raises them as his siblings, doing the best he can to give them the life they deserve. He is also heroic and brave in nature and cannot stand idly by while others get hurt and will often recklessly leap into battle to take down foes. He can also be stubborn or childish at times and does not like taking orders from adults and will make certain mistakes. He also dislikes to show his more sensitive side and tends to hide his tears when around his family.
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