Looks: She have light purple skin and she have purple eyes with bangs with strips on it.She have a horn on her head.
Unicorn, Pegasus, Earth Pony, Alicorn or Other:Unicorn
Weapons/Powers: She is able to use unicorn magic to use it for combat.She is Wingo-Possesed pony. (Just to let ya know,this is my OWN story.) Twilight is currently is in a nightly form called a werepony.
Cutie Mark: A pink star with..SPARKLES FCDSUVCD]YGBCHB
How they got their Cutie Mark:Twilight was a filly when she got it and she read tonssss of BOOKS
Personality:Nice,Smart-Minded and Gentle with ponies.
One night, Trixie sneaked back into Ponyville to Twilight's house. As Twilight sleeps, Trixie casts some sort of spell, infecting Twilight, causing her to transform into a monstrous version of herself. This change went on unnoticed by Twilight, until the next night, where she was awake when it happened again.
Twilight, shocked by the transformation, looked at herself in the mirror for quite some time, only for Spike to come in and see her new form. At first, Spike didn't recognize Twilight and thought she was some sort of 'monster pony,' only to be convinced it was her when Twilight spills she knows that he has a crush on Rarity.
Other strange things start happening in the night as well, such as Cheerilee suddenly becoming mean towards others, and Rainbow Dash fighting against strange looking ponies. Twilight headed towards the latter, when Rainbow Dash fled from the battle after the ponies proved being too tough for her to handle, and finds that she now has cryokinetic abilities as well as a lust for battle. After defeating the strange ponies, Twilight went back to the library to study more about these strange events happening that night.
The next day, Twilight continued researching on the events, as Spike noted that she returned to her normal form. As Twilight continued to rack her brain on what the events have in common with each other, Spike belches out a letter from Princess Celestia, urging Twilight and Spike to come to Canterlot Castle. On the way there, they encounter Cheerilee again, but she's back to her usual self, baffling Twilight and Spike from what happened last night.
At Canterlot Castle, Princess Celestia informs Twilight and Spike that Equestria was being overrun by Windigoes. The Windigoes have been possessing ponies and turning them into hate-filled creatures during the night. Celestia also revealed that Twilight too, is under posession of a Windigo. Celestia added that while Windigoes can possess ponies, they can go even further by rearranging their physical structure, turning them into monsters. Those who wield the Elements of Harmony are immune to possession. She also mentions that smaller, weaker copies of them are also running amok. Celestia gives Twilight the Elements of Harmony to fend off the Windigoes, but to their surprise, the Elements have been drained of their power. Celestia notes that the Elements run on the ponies' harmony, and the Windigoes' influence is rendering them powerless. She then assigns Twilight with the task to restore the Elements, by getting her friends to perform great acts based on them.
((Got it from Tum Pony)