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. His best friend is Cesar Torres, who he has been friends with ever since they were children. Mark was an average young man. His interactions with Cesar showed he was concerned for his family and friends. He appeared to be paranoid about going over to Cesar's house, notably due to the 'THINK principle' being broadcasted