Princess Luna

"You no longer have reason to fear us. Screams of delight is what your princess desires...not screams of terror."

- Princess Luna

Princess Luna is Princess Celestia's younger sister and Equestria's co-ruler, in the first episode of season one, she was the antagonist Nightmare Moon who threatened to create an eternal night. She was later purged by the Elements of Harmony, and was invited by her sister to rule by her side. Princess Luna now enters the dreams of her subjects, mostly children, to assist them in defeating their nightmares.

Seasons 2 and 3
At the beginning of Seasons 2 and 3, it's revealed that Luna, alongside Celestia, turned Discord to stone with the Elements of Harmony and imprisoned King Sombra in ice while turning him to shadow, about a thousand years ago sometime before her transformation into Nightmare Moon.

Nightmare Night
In the season 2 episode "Luna Eclipsed", Princess Luna, now uncorrupted despite being mind controlled by her Nightmare Moon persona(And with a new look. Lauren Faust, the show's creator, stated that this was because when Nightmare Moon was defeated, Luna was reborn with very low magic levels, and she transformed after getting her good powers back), returns to Ponyville during the holiday Nightmare Night(Equestria's equivalent to Halloween), a holiday dedicated to Nightmare Moon depicting her as a scary bogeyman. Luna, with Twilight's help, tries to change her image from that of the terrifying Nightmare Moon, to a favorable one as Princess. Unfortunately, the nature of the holiday, combined with Luna's outdated mannerisms and flair for the dramatic, make her subjects more scared of her than ever. Her first attempts end disastrously, prompting her to decree Nightmare Night canceled, but Twilight persuades her to give Ponyville another chance. When Luna discovers that the residents actually enjoy being scared as part of the night's festivities, she uses the Nightmare Moon persona to help them have fun and thus gains their trust and friendship.

Season 4
During the Season 4 premiere two-parter "Princess Twilight Sparkle", Twilight attempts to figure out the source of the chaos seizing Equestria by drinking a potion which gives her flashbacks of the past. One of the flashbacks she experiences is of Luna becoming Nightmare Moon and assaulting Princess Celestia. At first Celestia is reluctant to fight her sister, but Nightmare Moon assaults her with dark beams and eventually wounds her, sending her plummeting to the ground. However, Celestia promptly recovers and arms herself with the Elements of Harmony, the power of which she channels into a powerful beam that overwhelms Nightmare Moon's defenses and seals her inside the moon. It's revealed she also aided her sister in defeating Discord a millennium ago.

Other appearances
Luna has a few cameos in the season 2 finale A Canterlot Wedding, flying in to guard Canterlot at nighttime, ironically not participating in the fight against the changelings for reasons unknown. After Chrysalis was defeated, Luna appeared next to Celestia and the Mane 6, asking if she missed anything.

She also appears in the season premier The Crystal Empire.

Powers and Abilities

 * Alicorn Physiology: Being a Alicorn, Princess Luna can fly and use magic.
 * Magic: Luna has great levels of magic just like her older sister Princess Celestia.
 * Spell Casting: Luna can perform many magical spells.
 * Moon Control: Luna is powerful enough to make the moon rise.
 * Transformation: Luna can transform into Nightmare Moon.
 * Weather Manipulation:
 * Transmutation: Luna can turn toy spiders into real spiders.
 * Dream Walking: Being the "Princess of the Night", Luna can enter any pony's dream.
 * Dream Manipulation: Luna can other ponie's dreams to other through doors, She cam also use the Dream World to show the past, present and future as shown with Sweetie Belle, She can allow ponies to share a dream with ease other and combin other ponie's dreams into one.
 * Magical Beam Emission: Luna can shoot magical beams from her horn.
 * Telekinesis: Luna can use her magic to lift and control objects.
 * Flight: Luna can use her wings to fly.
 * Enhanced Strength:

Similar Heroes

 * Dr. Henry Jekyll (The Strange case of Dr. Jekyll and Mr. Hyde)
 * Queen Elsa  (Disney's Frozen)
 * Anakin Skywalker  (Star Wars series)
 * Maleficent (Maleficent Film)