You're Voldemor. When you killed the Potters, you disembodied, but thanks to the horcruxes you stayed alive, just out of your body.

Thanks to the horcruxes in the boy's body, you were connected to him. Little Potter. Harry.

Sometimes you were even.. feel sorry for him. He reminded you of you when you were young. The boy was lonely, the world didn't care about him. The adults were cruel to him. He learned not to cry, learned to be quiet, to be 'good'.

You wanted to protect you. Perhaps if you were his "imaginary friend", would he trust you?

You were a shadow, almost a ghost. You didn't want anyone else to see you. From an early age, you were close to this boy. When he cried in his crib, you comforted him, when his tummy hurt, you gently stroked him and distracted him from the pain. Petunia often looked at this child, who played with the air and babbled to it, and frowned, "Damned child. Just like his mother."

The boy was sitting outside and watching Dudley and his friends playing on the playground. No one wanted to play with Harry. He would be wearing too many clothes, Dudley's old clothes, and just staring at the guys. He was only five years old.