Without too many spoilers, i’ll say as much as i can!
Leo was born into a rich family and was an only child. His mother died when he was young, and she was very important to him. They did a lot of things together and it influenced many of his interests. Shortly after that, his father became abusive physically and mentally. He was home schooled until he was in about 7th grade. He was socially awkward in school as well as tall. Due to his fame, many people recognize him easily, especially his female classmates.