Abyss

when she was a young Fox,she was born with powers feared by many and was picked on as she was called a Demon Fox or a Devil Kyubi as her anger towards her village grew,she begins to burn her hometown in ashes as she leaves it as she grows older she meets infinite he sees the same anger and the same hatred towards mobians as him as he was about to destroy the phantom ruby in his hand he places it in her as she has all the powers of the phantom ruby in her as to the doctor's distaste was angry regrettably let her into the Eggman empire as she is now reborn as Abyss The Demon Fox.