Alexis Castle

Alexis Castle is Richard Castle's 15-year-old daughter, but she operates primarily as his therapist, chef, and research assistant. She is the only stable member of her family — and is not yet out of high school. Near the end of almost every episode, this intelligent, thoughtful, and pretty girl off-handedly mentions something to Castle that cracks the case for him. It's been estimated (by us) that she has solved 85 percent New York City's homicide cases.