Little angsty concept with Nightmare's shape-shifting ability because I listened to Copycat again so my mind is racing
So what if Nightmare, being traumatized by the fact no one loved him, started using his shape-shifting ability to slightly alter his body to fit people's taste ?
Depending on the person he is with he will change how he looks like, he will change his appearance each time someone mentions liking a certain trait
Or even angstier taking the form of his old self as to please Dream but only pushing him away because Dream thinks he's doing that to torment him when really he's trying hard to be liked by him again by looking like the one he used to love
He wants to be liked, even if just for his body, he craves validation and so modifies his own body over and over again until he doesn't remember anymore what his real appearance is because he takes too many forms
He's confused when someone tells him he doesn't have to do that because obviously he does ? How are people gonna like him if he doesn't meet their expectations ?
He'll eventually have an identity crisis once he realizes how far he's gone