Princess Luna

Princess Luna is a main character of MLP: A Royal Pain. She is a gothic mare.

Appearance
Luna's coat is a dark shade of blue, and her mane is partially translucent, rippling and sparkling like Princess Celestia's.

Personality
Princess Luna is a gothic mare.

Princess Twilight Sparkle
In Cake Monster - Part 2, Luna and Twilight help get Princess Celestia snap out of her cake craze.

Trivia

 * Her character is most noticeably based on Raven from Teen Titans.
 * Her favorite color is black, because it's the "color of her soul.
 * Luna can be a bit slow when running, yet can quickly change her tiara.