Kelly 087 is one of the children that is chosen to train as a Spartan. She is assigned originally to John's team when Dr. Halsey starts to train them as Spartans. John thinks that having a girl on their team is going to slow him and his other teammate down, and potentially cause them to lose. Kelly, however, is extremely fast and accurate, which helps John's team to win the competition. Kelly continues on as a Spartan with John and is often used in training missions and real missions because of her agility and speed.