Once upon a time, in the land of Equestria, there lived an innocent alicorn pegasus filly by the name of Princess Erroria Alula.

The only problem is, nopony knows where she comes from, or who her parents are, or why she's an alicorn but nearly everypony else is not. She is definitely normal and is not going to save Equestria from certain doom or anything.

Error's Alula's also missing a cutie mark. So she's going to get one.

While saving Equestria, of course. While being a completely normal everyday pony, of course.

Derives from canon, around about the time of Call of the Cutie. Princess Erroria is due to an animation error and nothing more.