Celestia

Princess Celestia is an Alicorn mare, older sister of Princess Luna, who raises the sun.

Appearance
Celestia is very tall and slim, with a square face, pink eyes, and a wavy mane and tail which both have green, purple, blue, and pink stripes.

Her cutie mark is the sun and she wears a golden crown, necklace and shoes.

Personality
Celestia is extremely wise, intelligent, caring, brave, and powerful. She also has a slight prankster edge to her but none of her pranks are mean-spirited.

Early Life
Celestia would raise the sun with Luna raising the moon, but Luna became jealous of Celestia because the ponies slept through the night but were awake during the day. When Luna turned into Nightmare Moon, Celestia tried to reason with her but it didn't work so she reluctantly used the Elements of Harmony to banish Nightmare Moon to the moon. A deed that haunts her still to this day. She took over raising the sun and the moon for a thousand years until the first episode.

Before Luna became Nightmare Moon, she and Celestia banished Discord into stone using the Elements of Harmony, taking them from the Tree of Harmony for the first time in a long time, possibly forever. It is shown that before Discord was banished, he temporarily took off her tail in order to play "pin the tail on the pony".

Trivia

 * She has a toy of her who is pink and talks in a much more arrogant way than the canon Celestia.
 * Twilight and Spike used to have to write to her once a week about friendship lessons. They don't have to do it anymore but they still sometimes write to her and some other characters do too.
 * Her mane and tail seem to be abe to move on their own, almost as if they were blowing in some nonexistent wind. Luna is the same. The only time Celestia's mane and tail stopped moving was when she was unconscious.