they grew up captive on a pirate ship for nefarious reasons, they were fairly young when they were captured, as in they have no certain memories of parents and family. Currently IM undecided if they were killed or are still alive. And likely entered a pact with something to gain the power to escape, having given up all hope on that happening, theyve probably sacrificed quite a bit.. or else they found a fairly beneficial pact. maybe. im not sure yet!
Once they had been able to escape, they killed and ate everyone on the ship.
They've also boarded vessels acting like a castaway, and killed and ate them too. yay! monster girl.