Leo grew up on the space colony Antilia orbiting Jupiter's moon Europa. The child of a broken family, Leo's parents divorced when he was only ten years old, custody arguments revealing him to be an unwanted child on both sides. Leo's mother left the household soon after, leaving him and his father to fend for themselves.
Leo's social life suffered as well, as Leo became the target of constant bullying amongst his peers. With the exception of Celvice Klein, Leo's own friends disliked him.