I am bored so take this shit.
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Nightmare:
He goes by he/them pronouns. He is a masc non-binary person who is AroAce.
I feel like he would fear cats because they remind him of Dream, positive and unpredictable. And Killer loves them.
He will break into Dream's house for the plain fact to scare him then leave, he thinks its fun to get negativity out of such a positive person.
I believe Passive Nightmare was partly convinced by Nim to eat the apple which is why C!Nightmare killed Nim (Don't questions C!Nightmare's logic).
C!Nightmare will listen to P!Nightmare's requests since he has P!Nightmare's soul haunt him but, most of the time won't actually do them.
He is scared of the internet and that's because he looked through Killer's and Cross's search history and saw himself with tits and got real scared.
C!Nightmare is really just a parasite that was in the apple who took over passive's body, He has Passive's memories and remember's his feelings but he didn't go through it but despite all of this C!Nightmare still has all of the trama.
C!Nightmare and Fresh know where eachother are always since they are parasites and this is an ability of theirs.
Nightmare can go into Passive's form but half of his skull is completely shattered and all of the bones are broken and some are missing used for other bad sanses missing bones. Nightmare broke all the bones while learning how to become plain goop so if Nightmare is in passive he is in severe pain.
Nightmare is a very chill guy who has dry and dark humor but is an asshole at the same time who just pushes all of your buttons you wanna just punch him. He loves feeding off Negativity.
Nightmare doesn't care for the bad sanses that much, he only has them to do his dirty work and be food sources.
Nightmare physically can not eat actual food or he will puke it all out since his food source is negativity and negative apples.
I will update this if I think of more