As I've said before, the nightmare species of monsters are all different. Unlike Brutes, aquatic, and aerial monsters nightmares don't have a specific species. They're usually fleshy and toothy but other then that they're all unique. I based this girl off of a Xenomorph, the alien from Attack the Block, and Venom >w>

This is Annabelle's monster form. It's rare for nightmares to be as young as she is. They're usually already in their early 20s or late teens when they arrive at the city, but Annabelle got there when she was 4. When nightmares arrive at the city it's up to a special police force to round them all up and assimilate them. And since Annabelle was so young she was adopted out. She's pretty lucky for a nightmare since she went to a good family. But nightmares, despite being so vastly different, tend to stay in groups and see each other as family. So she's still also close to the nightmare group she arrived with at the city with, one of them being Kai's mate Eiji. Nightmares are rare to come by and there's only a handful of known nightmares in the city.

So yeah, Annabelle is a slim creepy creature with a venomous spike on the tip of her tail. Her venom isn't deadly, it just stops the body from moving for a certain amount of time. It depends on the size of the monster. Annabelle is also very self-conscious of her monster form. Rarely does she transform. The situation has to be life and death in order to get her to turn.

Art/Annabelle © to Angry_Koala