Luna is a talking black cat that is responsible for finding the Scouts, and motivating them to fulfill their destinies. She gave Serena her transformation broach, and gave Mercury and Mars their transformation sticks. She eventually finds the Moon princess.
Along with the memories of the Scouts' past and her knowledge, she is on a mission to re-assemble the scouts with the aid of a talking white cat ( artemis ) with whom she communicates through the Sailor V videogame in the arcade. She is a main motivational source for the less than motivated Serena.