Luna

Luna is the black cat guardian to Serena (Sailor Moon). They first met when Serena was late to school and Luna was being picked on by some little kids. After chasing the kids away, Serena discovered a crescent moon mark on Luna's fore-head. After doing so Luna realized that this cry-baby was destined to become the fighter for love and justice, Sailor Moon. Luna has guided her through the years and has helped her to become the warrior she is today.