Stek

Stek is the fox who got caught in the same flow of magic as Erwina, rendering him able to use magic, talk and be extremely snarky.
After sharing a part of his very own soul with Erwina, as she did with him, they quickly developped a strong bond, similar to a brother and sister one.
He was very helpful the first days after Erwina's transformation, as she was not dealing as well with it as Stek did.