round-faced, fair-skinned young man with fluffy brown hair and brown 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 early 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 reasons, whether due to an experience or simply his exaggerated paranoia is unknown.