Top Definition
A character from the show My Little Pony: Friendship is Magic. Little sister to Princess Celestia, she is in charge of raising and lowering the moon at night. Though appearing in only two episodes, she has gained a large amount of popularity among the fanbase due to fanfiction.
Some people follow Princess Luna so closely that they even want Celestia off the throne
by Dr. Eightsidesapus January 15, 2012
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