Lily is Mona's second best friend. Before she was a quiet, shy girl who had her hair covering her eyes. She soon became Princess Giant, a braver and stronger version of Lily (a secret identity suggested after Lily expressed the rather boring idea of being 'big' as a characteristic superpower). Lily once fell in love with a cartoon character. She has also been in troubling situations such as when Frankenstein was going to transplant her brain. In an episode involving a werewolf, she refused to be used as bait in a trap for the beast, insisting it was sexist and leading to a reluctant Charley being used instead.