Natalie Mayhew is the only daughter of Susanna Morales and Roger Mayhew. She is the First World's version of the daughter of Judge Susanna Morales. Natalie can at first seem to be cold and distant from others, often hanging out with her "clique" and spending more time on her phone than talking to others. However, she is shown to be very brave, considerate and protective, as well as able to think very quickly when the situation calls for it. She has a heroic side, hoping to be able to help others, and is intrigued by the mystery of the Greystone children, involving herself in it and trying to think up different solutions and suggestions to what could be happening in their lives. She is also very tech-savvy, able to break into Kate Greystone's phone and is very useful on her computer. She holds a resentment for her mother due to her parents' divorce and her feeling that her mother doesn't understand her and treats her coldly. At first, she was distant from the Greystone children as well, thinking they were simply the children of one of her mother's clients, but even then she made sure to follow Finn and ensure his safety. She ends up very attached to and protective of Finn. She is very resourceful and clever, and able to think fast when the situation calls for it, such as when she is approached in the Other World and quickly pretends to be her alternate self.