#killercrossmare

[gayundertaletrash]

Nightmare headcannons ✨

These are just headcannons I have for my favorite goopy boy. Some are from other people but a lot are from me.

(Trigger warnings- mentions of abuse, maybe body horror, animal death and eating, cannibalism, trauma, eating and sleeping disorders, self h@rm)

- Nightmare is FtM and uses he/it/king pronouns (I image he loves the idea of neos and xenopronouns to). He is a gay man, and is aro-specrum. To be more specific he is aro-specrum and cupioromantic, along with queer platonic. He is also ambiamorus.

- He is married to Cross, is dating Killer, and is in a QPR with all the Bad Guys+ Error, Lust, and Blue.

- Nightmare is generally very quiet and doesn't engage in conversion unless invited. He prefers to listen to others. His main love languages are quality time, physical touch, and giving gifts and acts of service. With the last two though, he doesn't like it when others give him gifts or do things for him. He likes to be the provider.

- Before his corruption he was pretty short (5'2) and is still short in his Passive form. After his corruption he grew to 7'6. He can change his height but prefers the height his goop makes him naturally. He has gotten very used to others being scared of how tall he is and doesn't care very much anymore.

- Because of his corruption, he is kinda uncanny. Certain features about him aren't normal looking. He has really long fingers that end in extremely sharp claws. His bones kinda clash together, an example is his ribs, which are melted together kinda, so he doesn't actually have individual ribs. His eye is also slanted and looks exactly animal-like. He has sharp teeth, and has rows and rows of smaller sharp teeth that go down his throat. He also purrs and growls like an animal. In all he looks less skeleton-like the longer you look at him.

- Nightmare use to be very abusive to the Bad Guys. After years of being a complete ass, he began to recognize his behavior and turned it around. He is now past his abuse and has made up to them all. He still has a lot of guilt from it, but knows he is better now. He started changing his behavior before Cross joined, so Cross beaver really got the bad part of Nightmare's behavior.

- Nightmare is made of two beings. There is the host body/soul which is Nightmare. And then the goop. The goop is an older creature that had followed Nim when she first came to the Undertale Multiverse. The goop and Nightmare live together as one, and can't separate without both dying. The goop can retreat back inside Nightmare though which makes him become passive. Nightmare has named the good Corrupt. Corrupt is a hive mind though, and is just the whole 'hive' acting together. Each of Nightmare's tentacles are part of this 'hive'. Each tentacle is named. They are named Jupiter, Venus, Orion, and Reginald.

- Nightmare is kinda animalistic. Thai is mostly because of Corrupt though. Nightmare purrs and growls, along with other noises like squeaks and chirps. He also makes nests sometimes. Nightmare also can ( and craves) meat. Usually he gets this from small animals like mice, rats, and bird which he can eat in one bite. But he has been know to eat just about anything fleshy. This includes dead deer, dogs, rotten meat, and sometimes human or other monsters. He still acts very proper though even as he eats a half rotten deer.

- The only reason he has eaten human or monster is to help Horror. Horror, like the rest of his au, had become addicted to the taste of humans and monsters. He hates the fact he craves is and Nightmare is trying to get him off it. But because it is such a strong addiction, he has to do it slowly. Sometimes, to help the process along, he will tell Horror he is feeding him human, while feeding his something like pork. The actual human meat Nightmare has eaten himself.

- Nightmare sucks at understand most social norms. After Dreamtale and Dream being trapped in stone, Nightmare pretty much locked himself away for over 20 years. During those 20 years he forgot how to be a normal person. It isn't uncommon to find Nightmare walking around the castle in little to no clothes, or have him walk in while one of the others are changing and just sit down and start talking. He doesn't care about norms very much either, so as long as the others are comfortable, he will do just about anything he wants.

- Nightmare has a lot of mental health and physical health problems. He has insomnia and hates sleeping also because of past trauma. He has a purging disorder, which is not binging but still forcing yourself to throw up. Nightmare is trying to get better about both of these things and is slowly making progress. He also has seasonal depression, C-PTSD, anger issues, and self harm tendencies. He is slowly getting better though.

- Nightmare loves gardening, and has a giant garden filled with flowers. He loves his roses though, which he takes great care of. He has an area of flowers dedicated to certain events, and will plant a flower if something good happens. He also plays the piano and has an old one in his study. His study is what he calls his library, which takes up an entire tower in the castle.

- Nightmare is very protective of the Bad Guys and considers them first before anything else. If he had to choose between them and the whole multiverse, he would let the multiverse die and teleport them all to a different Multiverse. He loves them dearly.

Ok, that's all I have for now, hope you enjoyed. :))