Gender: Female
Species: Some Sort Of Snakey Thing
Age: Unknown, including to her. Quite old, but also kinda meaninglessly so.
Background: Her earliest clear memories begin after the defeat of Nightmare Moon at the hands of Twilight Sparkle and her friends. Asleep - hibernating, really - in one of the cellars of the Castle of the Two Sisters, the noise of the battle above was enough to wake her from her sleep, although it would eventually be several months after that she would finally wake up entirely and leave the castle. She has no clear recollection of the time before that - the most she remembers is language, some skills, fond recollections of her mother, fleeing from a mob of angry ponies and a vague notion that this wasn't the first time she hid somewhere for tens - possibly hundreds - of years until whatever happened blew over. She definitely doesn't remember Ponyville being there before, although the Everfree Forest definitely was. She traveled - wandered aimlessly, really - for some time after that, both hitching rides with the odd traveling merchant or as a stowaway here or there, mainly avoiding large settlements before, after some trial and error and quite a bit of assistance both professional and personal, opening a small sculpture shop at the outskirts of Manehattan.
Personality: Generally unstable. Not only due to her inability to keep her emotions in check, but also the fact that her mood shifts rapidly and unpredictably all over the spectrum. This, in turn, makes her rather difficult to get along with for a prolonged period of time and has, in fact, caused quite a bit of unintentional bridge-burning.
Skills and trivia:
She seems to be an exceptionally skilled stone sculptor, and sells remarkably lifelike statues, although she is very private about her work.
While she doesn't have any conscious control of her "hair", it does seem to behave as an unconscious extension of her body, although she isn't able to see or otherwise sense anything through it other than being touched.
It's unknown whether she's the only one of her kind - all she does know is that she seems to be a novelty to everypony {and other species} she's met so far. She has no memories of any sort of pogrom or other event that would cause her species to go extinct. It is entirely possible that her family, so to speak, may be, for whatever reasons, be in hidernation as well, but there is little information either way.
When you said set up a statue shop I immediately thought “Medusa!” But then I read the rest of it and thought “Looks like a cool OC”