Idea 1 involves a girl with two personalities - one innocent and one a killer. The killer personality emerges when she thinks she's asleep to go on killing sprees. She starts to realize this and her personalities clash, with the evil one taking over completely in the end.
Idea 2 is about a man who is traumatized by a clown as a child. He starts seeing the same clown in windows and being followed by it. It eventually possesses him and he turns into an evil clown, covered in blood.
Idea 4 involves a girl who finds an object that unlocks 100% of her brain. This causes her to lose her sanity and develop an evil alter ego. She