Soo.. throwing my lot in here because damnit I've been wanting this for frekaing Ever!
Physical Appearance: (Her eyes are in fact Dragon-slitted)
(It's supposed to represent Chaos, but its hard to find an appropriate cutie mark for that.
Name: Night Star
Age: Adult pony
Birthplace: Unknown to most, though she was born near the Everfree Forest
Residence: She wanders, but generally has a small home near the Everfree Forest hidden amongst the trees
Occupation: She steals and wreaks Chaos for a living
Born of Discord, she appears your average pony, when using her magic her horn will glow a yellow color, similar to Discord's own aura. She was raised by her father to believe that Chaos was the true way of things, That order and Friendship were Lies and Falsehoods, She is intelligent and quite the logical thinker, having hidden herself when Discord was defeated once by Celestia and Luna, then again by the Mane 6. These 8 ponies she hates with an absolute passion for taking her father from her. Her wings in fact were the byproduct of early Chaos magic that she tried to accomplish as a filly, it changed her wings to those of a butterfly and they have remained this way since.
While she has a younger sister in Screwball, She rarely shows this softer side of herself to anyone but Screwball. She is usually always seen with a cloak that hides her body, and thus her cutie mark. Leaving only her head and horn to be seen behind it. It is her goal in life to restore her father and take sweet revenge upon the ponies that took her father away, and cause the Princesses utter misery for leaving her so alone.
Personality: She takes after her dear old father, Though she is quite mean to others and enjoys laughing at other ponies expense. She actually fears being all alone even though her general nature tends to push others away. She is mostly a Gemini in nearly all sense of the word.
Likes: Causing Chaos, Laughing at other ponies, Her father, Little Screwball
Dislikes: Order, Friendship, Celestia.
Fears: Being Alone.
Abilities: Causing Chaos on a medium scale (not as powerful as Discord himself, more like half his power)