Princess Luna has a starry mane. She has a moon with a black backgrund as her cutie mark. She is also a princess. She has an older sister named Princess Celestia. Princess Luna used to be Nightmare Moon as she was jealous that when it was Princess Celestia's fault to make the ponies play during the day and they slept during her beautiful night.
Your My Little Pony reporter, Twilight Shimmer. Edited by Anonymous.
Princess Luna's color variations Also note that Pink Luna appeared in Castle Creator because there was an unused scene in some episode that Rarity make up Princess Luna to let her be like that (the Luna at the left of the bottom row)