Here have some Anti Danny.
I like the idea of him only hissing in ghost speak. And also that that he’s some sort of entity created from when Danny first started up the portal. And that he has all of Danny Fenton’s memories but everything is warped. And that he thinks the real Danny is this white haired ghost named Phantom stealing everything away from him. And what if Anti Danny was literally the half of Fenton that died, and because he’s just literally half a ghost, he’s unstable? Okay, I’ll shut up now.