So another Danny Phantom Au is where halfa's have a third person inside them and it's close enough to say a firewall, incase original 1 and 2 are KO/completely injured to the point where they cannot protect themselves. It's similar to your Shadow Au, but this would take complete control over the body to protect its host. While the originals 1 and 2 are not conscience. No one except for Clockwork (or others who watched/saw this happening) know the full story. And the core is opposite of the user.
Okay so just checking:
- Each aspect of a halfa is a separate entity. There are three.
- Usually the human or the ghost are in control and the third only acts in self-defense when the others are incapable of such, such as when they’re unconscious.
- This naturally means that neither of the first two would be aware of the third unless told by a bystander.
- Clockwork knows because he knows everything.
- Because Danny’s ghost has an ice core, the ‘shadow’ is fire aspected.
That’s a pretty cool AU! Reminds me a little of a fic I saw once. Give it a look, you might like it.