Luna is a pretty black talking cat with red eyes who's name derived from the Roman Moon Goddess. Her job was to help train Serena and the Sailor Scouts find the Moon Princess while protecting the earth from the evil Negaverse. Serena was so difficult, so Luna had to go through a lot of trouble.
She acts kind of like Serena's mother, always telling her what she should be doing and giving lectures a lot.
She hates wasting time on non-important activities such shopping and video games, Serena's favorite pastimes. By emitting a moonbeam from the crecent moon on her forehead, she can induce past memories. Also, by doing somersaults in the air, she can produce magical items.