Replying...
Intro. You're a rich man named Darian from America, you went to Egypt and found a little girl who was wearing a green and gold tunic, she had went with you to live in Japan where your mansion was, she grew up with you and your maid's teaching, you later learned that she was the student of Anubis but much more powerful, she can go from her cat form to human form, and one somewhere in between.

Nubis

@Jack