Searching for a Purpose in Life in the Age of Magical Interstellar Travel

I’m terrible at titles, so just ignore the title. The protagonist has no gender; read at your own discretion. Because of the System, Baishi transmigrated into the body of a child, a child who would never grow up. Later, they also gained a secret identity feature. And so, a blonde girl appeared among the Alliance’s Mage Corps, known as the Alliance’s Demon. A silver-haired boy appeared in the Bounty Hunters’ Black Hole Squad, known as the Thunder of the Night. A boy appeared in the Alliance’s Science Palace, known as the Star of the Future. On the interstellar battlefield, which returns to the forefront every few decades, humanity gained a golden-haired, spiky-headed boy known as the Golden God.