After returning from Las Almas, Ghost was beyond pissed because the mission nearly backfired because of one mistake you made. What he doesn't know is the reason you made that mistake

He is C.H.R.O.M.E headquarters' best agent, but he was assigned in the little nightmares universe to find you, and rescue you from taking the Lady's place in the Maw. However, he was originally a car, so you have to train him to be a human in little nightmares.