Here's my CS! I think everything's in order.

Name: Starlight
Appearance: Starlight is a light lavender mare with a long peach mane (think sunsets) with three streaks, a dark orange one, a hot pink one, and a dark purple one. She cut it short for convenience in battle. She has eyes the same shade as her hair and her cutie mark is three white stars.
Race: Pegasus
Fraction: House Everfree
Skills: Her talents are her knowledge of stars (she can use the night sky like a map) and the unusual fact that her speed doubles at night (though she still isn't all that fast). Other than those things she was a normal Wildling Pony, skilled in fighting and was just a bloodthirsty as anyone else.
History: starlight was a very moral pony, and always asked herself if what she was going was right. When the war started she was confused and terrified, but as everyone she knew started to join their sides, she knew she had to do the same. She choose to join House Everfree because she knew of Fluttershy's kindness, and believed that she would try and stop the war. Eventually she started to slowly stop asking herself if what she was doing was right and started asking herself if what she was doing is what Fluttershy would want her to do. And when Fluttershy snapped, Starlight was still just as loyal. One day during battle she saw something disturbing, something so horrifying it would change her forever, something that was no doubt one of the most horrifying things any pony could ever see. She saw her own foal mutilated into some abomination. When she learned that ponies who betrayed The Cult where turned into what she saw, she knew that her son did it because he was trying to make peace, just like Starlight tried to do by joining House Everfree. She asked herself again if what she was doing was right, and she discovered that the answer was no, and had to do something about it.
Others: just some fun facts.
She's 45 in human years
She did lots of traveling when she was younger, and she always has an interesting story for anyone that wants to listen.
Her speed at night is not a result of her special talent, but actually from a rare genetic disorder called Noctoariolis.