Return to Hogwarts: Harry Potter.

Harry Potter, torn from the war, with his friends dead along with his parents and so many other people, he couldn't take it anymore.

One day, while walking to Godrics Hollow, to see the grave and mourn his parents, along with others he knew who where buried there. He saw a dark figure, Harry immediately recognized it as a Dementor, but it didn't attack, it stood there watching him keenly until it lept forward, it put it's head by his and Harry could feel his soul leave his body, but instead of the feeling of his soul being destroyed, he felt it grow powerful, his magical core bursting with energy and light. Then he felt a sensation similar to apparition.

When Harry opened his eyes he was in a dark room, he recognized it instantly as his cupboard at the Dursleys, he slightly opened the door and saw Petunia in the kitchen, cooking. She glared at him a bit and Harry ignored her, but then he looked down and saw his body, thin and short, he looked so young, suddenly something hit him; he didn't look young, he WAS young. He was sent back in time.