He can be made playable by befriending and asking him to move in, or by marrying him. Mark has the same facial structure as Gary Walton. As far as personality, he is very active and quite playful. But Mark is very sloppy, quite shy, and somewhat grouchy. He is mostly interested in Food, Crime, and Work. According to Mark's SimDNA in SimPE, his hair was brown before it turned grey.