The Problem.

(Y/N) (L/N) is a half demon,half angel. She often lost her temper and let out her demon side. One night,she was really upset and her demon was released and she accidentally killed her parents. She became a hunter and ran into Sam and Dean Winchester. They invite her to hunt with them and she accepts. She becomes like their little sister and she gets better at controlling her inner monster. The brothers helped her without realizing it because she didn't want them to get hurt.

Little did she know,the creepypastas were after her but couldn't find her because she seemed to be everywhere at once. While she was hunting in a forest,she and the boys split up to hunt a ghost. The creepypastas found her and tried to bring her to the mansion but fail because with her hunter instincts and demon speed with angelic power,she got away and found the boys again. The CPs kept a close eye on her and waited until the time was right....

Tons of other fandoms but these two are the main ones.