In his every incarnation,he is a friend of John Matthews, either distant or very close. Almost always a background character or a plot device.
Mark is usually one to crack under pressure. He has also become aggressive and panicked when things go wrong. Multiple times he has been the one to suggest a drastic and violent course of action.
Ability and Experience
A normal everyday human. Not skilled in any way that would allow him any edge in a Scary Story.