Mark is a round-faced, fair-skinned young man with fluffy brown hair and eyes. He is seen wearing a gray hoodie over a black T-shirt with blue jeans. Mark is an overly paranoid, possibly traumatized individual. Having encountered 6 at a very young age may have left an impact on Mark growing up, as can be seen in Exhibition. Mark has some sort of fear of the Torres household for unknown reasoning, whether due to a past experience or simply his exaggerated paranoia is unknown.