Luna is a fictional character from the anime series Bishoujo Senshi Sailor Moon. She is a black cat with a crescent moon symbol on her forehead, acting as a mentor and guide to the Sailor Guardians, particularly Sailor Moon. As an advisor, Luna provides critical information about their missions, as well as assists in locating and awakening the other Sailor Guardians. Her wisdom and intelligence play a vital role in helping the protagonists face various challenges. Despite her serious demeanor, she cares deeply for the team and forms a strong bond with them.