Y/n is a daughter of the Nightmare king and the Queen of dreams.She was born in the dream world but her mum died so her grandfather used a special ability he had to bring her out and into the real world but a sacrifice had to be made.He died after he did it so her grandmother raised her and taught her everything she needed to know about reality.She died years later and Y/n was put in an orphanage until Cooper's parents adopted her.She has powers that even affect reality.
Y/n goes by a few names which are her atual name,the hybrid princess,Goddess of the hybrid world,Mystery,Princess of the nightmares and finally the Princess of the dreams.
The princess of dreams,princess of nightmares,Hybrid Princess/Goddess names are all known to be the same person.
Nightmare princess
Dream princess
Dark hybrid princess/goddess
Light hybrid princess/goddess
Mystery is known as another person and Y/n is just a 'normal dreamer with no powers at all'.
She fears her father finding her and making her into his little evil daughter.He is able to corrupt her into being his little evil daughter. She also fears her friends finding out about her because she lied so much about it and kept big secrets from them.