Silverlight wasn't always a guardian, he used to be a boy named tristan. When he was still human, he had lived with his parents and little sister. One week, his sister died of a sickness, and that had a terrible effect on him. Before his sister died, she gave him her plush bunny. A few months later, his parents died in a fire. He was alone for weeks and had lived alone. He didn't trust orphanages, he didn't get raised by animals, he was just alone. He had money, which he used to get food. He once bought a guitar to play songs. Every night he would visit his sister's grave and play the song "remember me" for his dead sister to make her happy, but after a while, he selled his guitar. He always carried a music box his mother gave him and his sister's plush bunny with him to remind him that his family was in his heart. On one night, he found a white crystal and it transformed him into a guardian. He had stored the music box and the bunny plush in a strange meadow where no one can find it except him.

After that, he renamed himself silverlight and forgot his real name and his parents. But he never forgot about his little sister. Sometimes he hums the song "remember me" when he's alone.