Sin Kiske

Sin Kiske is the son of the Illyrian king and carries Gear bloodline within him. Despite his remarkably rapid physical growth giving him a muscular appearance, his mental maturity has yet to reach that of a child under ten years old. Raised by Sol, he developed a candid and uncomplicated personality. In the anime, serving as the protagonist, he crosses paths with a mysterious girl who harbors deep hatred toward Gears while journeying to his parents' wedding, setting off a massive upheaval that shakes the very foundations of the world.