Claire Nefarius is the daughter of Larius Nefarius and a minor antagonist of the series. She was in Quantum of Johnny. She had a party and hid to launch missiles into her father's factory (which was nearby) in order to get her dad to spend more time with her.
In Quantum of Johnny, Johnny constantly mentions that she is hot. At the end of the episode, Larius Nefarius learned of his mistake and promised to spend more time with her and act like a father. He started by forbidding her from dating Johnny because she is too young.