Matthew is 12. Matthew is blonde. Matthew is blue-eyed. Matthew is 5 feet tall. Matthew is mentally deranged. Matthew is a serial killer.
Smart. Witty. Funny. Adorable. Deranged. Deadly.
Matthew is simple in his "tools of the trade." He just carries around a box of latex clothes and a change of clothes in his schoolbag.
Matthew is known for using items near his "playthings" that are there naturally. He does not bring in foreign objects such as guns or knives, but will use them if they are in the area. He is known (well, not "known" of course because then he would not be able to get away with it) for making every crime look like either an accident or a suicide. In one case he managed to leave the evidence that another party was involved and had them locked away in solitary for accusing a 5th grader of such a haneous act.