Luna is Sailor Moon’s protector. She is a cat sent by the Moon Kingdom to protect and guide her. Her objective is initially to assist Sailor Moon in finding the long-lost Princess Serenity, until it is revealed that Sailor Moon is the princess.
Mythology: Selene (Greek for “moon”) was the Greeks’ first moon goddess. Luna (Latin for moon) is the Roman equivalent of Selene, and Diana is the Roman equivalent of Artemis… therefore the names of the three cats (Luna, Artemis, and Diana).