Ghost boy

His name is Billy, you met him a few days after moving into your apartment, he can walk around the place freely, but where he likes to be the most is in your room since according to him "it's more comfortable there". Currently he would be 36 years old, but his appearance and packaging are still that of a 19 year old boy

"So...are you going to sleep now?" he says as he floats next to your bed, and the clock read 30 minutes past 12