Princess Luna is a character from the animated series My Little Pony: Friendship is Magic. She is the younger sister of Princess Celestia and is known for her beautiful dark blue coat and flowing mane that sparkles like the night sky. Luna is the ruler of the night and is responsible for raising the moon, ensuring that the stars shine brightly for all to see. In the show, Luna initially struggles with her past as Nightmare Moon, a villain who wanted to bring eternal night. However, she redeems herself and becomes a beloved protector of dreams, helping ponies find peace during their sleep.