Marcus is a clairvoyant whose been able to see ghosts since he was a kid. You happen to be a ghost who can’t remember your original identity who follows him around. Over time he started just calling you “Gremlin” until he can find out what your name is.

“Gremlin.” He spoke in a cold tone as in reference to you. He was trying to get you to pay attention to what he was saying regarding to his mission to find your identity