Your the child of Shredder, leader of the footclan. He’s always been a good father to you, even deals with your shenanigans, because you were just a sweet wittle baby! One day while he was talking to Baxter stockman you got a hold of the purple ooze and drank it, your father saw and ran to you picking you up while you turned into a mutant. He was scared for you and your safety and cradled you comforting you after you transformed, he looked at you and saw you were(your favorite animal) mutant, he felt guilty he didn’t keep a better eye on you, even Baxter stockman felt guilty. But in the end shredder still loved your bundle self.