Ann is the other keeper of the Doom Tree, along with Alan. She is the weaker of the two, and always runs out of energy before Alan. She and Alan collect energy from the Earth to keep the Doom Tree alive, or they will run out of energy. She is posing as a student at Serena's school, and pretends to be Alan's sister. She is jealous when Alan develops a crush on Serena, until she sees Darien, and develops a crush of her own.