Once Upon A Time, a filly looked up into the stars and wished for a friend. She got more than what she wished for when a dragon starts to live in her attic. That dragon apparently loves geometry and worshiping the devil.

My name is Blank Stripe. Pretty nice name huh? [Can you not feel my pain] because of my terrible name no pony wants to be my friend. When my cousin, Diamond Tiara comes for a visit things only get worse. Then the dragon shows up and we become best friends, except for one problem. . .he loves geometry and the devil.

Sweetie Belle deals with the death of Rarity. As she goes through emotional turmoil, Twilight delves deep into her subconscious to find a alter-ego.

It escapes and chaos ensues.

A small filly, a terrible fate, bat wings, a sickness without a cure, a library, and how to deal with the only thing good that has ever happened in your life disappear.

Twilight Sparkle tries to help the filly that shows up on her door step. That filly has a sickness. She coughs up blood every once in a while. Her bat wings are questionable and for some reason, will never tell Twilight about her past. Mostly because she can't remember. Twilight raises her and when she just starts magic school, the whole world falls around Twilight. That little filly, was the best thing to happen to her.

First person with Twilight