Name: Midnight Glow (formerly Princess)

Gender: Female

Age: 1022 in pony years (22 in human years)

Race: Alicorn

Appearance: Black fur with starry and glowing white dots all over, purple eyes, which have been described as "glowing like the stars". Her mane and tail are dark blue and purple and actually features constellations within her mane and tail and she also glows in the dark when midnight approaches, hence the name. 

Height is around the same as Princess Luna, but only slightly taller.

Aliases: Princess of the Stars, Princess of Midnight.

Cutie Mark: Spiral Galaxy

Personality: Midnight is very sweet and very kind to all ponies, but can feel angered and aggressive when in distress, leading to outbursts to other ponies, but never actually means the things she says and is quick to apologize and ask for forgiveness when her temper gets the better of her.

Background: A long time ago, back before Luna turned into Nightmare Moon, Midnight actually ruled Equestria alongside Celestia and Luna and it was her job every night to make sure the night skies were filled will bright and shiny stars, as Luna was too busy and too strained by lifting the moon every night to worry about the stars. Over time, Midnight grew to like the position and was even proud to be called princess. But one day made all of that go away.

One day, Midnight suddenly started to feel the pressures of being a princess weighing down on her: No sleep, hardly any time to socialize or eat and the constant worry that she would one day fail and be left as a humiliation in the face of ponies. And then one day it grew to the point where she started questioning why she became a princesss and if she'd be better off quitting, but Celestia and Luna always talked her down. Even with their wise words, however, Midnight's only option for ridding herself of these burdens was to resort to more... drastic measures.

So, Midnight used her magic and cast a spell over all of Canterlot. A spell that made everypony, including Celestia and Luna, be oblivious to Midnight's existence and knowledge that she ever was a princess and Midnight she destroyed all evidence of her previous life. Celestia and Luna simply went on with their lives, without ever knowing who Midnight ever was.

Ever since then, Midnight has been in hiding, still doing her duty of putting her lovely stars into the night skies, but has only ever gone into a village for food.

Nopony would ever know who she was... until now!