A Nue is a mythological Japanese creature said to have the face of a monkey, the legs of a tiger, the body of a tanuki and the front half of a snake for a tail.
You can always give mc and rose a sibling bond that she just got confused by and have her figure it out when Bella comes and sees that Bella is her actual mate
I really hope he saves his parents it will be interesting to read how the story will be. You can have him develop a seal that block space and time moves he can say he developed it to battle his father.