Marmaduke "Moose" Mason is a muscular, handsome star athlete but is a poor student. He often says "duh" at the beginning of sentences, and is possessive about his girlfriend Midge. He also is known to be dyslexic. He is dimwitted and can be easily manipulated by others, particularly Reggie. He will beat up anyone (particularly Reggie) who upsets him or even talks to Midge, the latter being a point of friction between the couple. At the same time, he is also kind, sensitive and helpful toward his closest friends.