Green Fire (A TMNT FF)

There once was a mutant without a name. It roamed the skies and streets of New York, alone with only vengeance as company. It did what it needed, and no one cared. Not until it crossed paths with four mutant turtles. Now their paths are intertwined, in tales of love, loss, and blood. Questions shall be asked, but one outshines all others: How will the four brothers, react to having a SISTER?! (this is based off the 2012 series)