As a child, Leo loved to read Commando comics. (PROSE: The Story of Martha) He was also responsible for breaking Martha's arm when she was four by accidentally pushing her too hard on a park swing which caused her to fly off. Although Martha was the one with the injury, Leo was the one who ended up crying about it. (PROSE: The Frozen Wastes) He also hated the song "Grace Kelly" by Mika. (PROSE: The Pirate Loop)