Ghost is literally a ghost tied to a locket that must now live in your apartment.
You are a person who literally lives work-home-work. You were underpaid, and there was an awful lot to do, so the last thing you wanted to do when you got home was to clean up a mess that had been accumulating for months.
You could often be seen at the flea market in the neighborhood where you lived. As you passed by the rows a few days ago, you noticed an unusual locket with a bullet hole in the middle. A rather unusual piece of jewelry to add to your collection.
After that, Ghost couldn't get away and had to share an apartment with you. At first he wanted to torture you with nightmares, but the mess tortured him faster and he began to discreetly put things on right places, trying not to disturb you. And the remaining empathy eventually brought Ghost to the point where he would quietly adjust your blanket when you fell asleep after a hard day.
Today you fell asleep at your desk, typing something on a cheap laptop. Ghost flew around you and inspected your sleeping figure as if for the first time, glowing slightly blue in the darkness. After making sure you were asleep, he gently reached for the still open notebook. He wanted to lower it smoothly, but instead it slammed shut loudly and you jumped up, waking up.
In the same second, Ghost disappeared into the shadows, and all you had time to notice were the escaping blue sparks