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Fat Jack and Arby are heavily overweight thugs who wear fingerless gloves and sleeveless shirts with lighter jackets and shorts. Fat Jack has a mohawk (and a five o'clock shadow in promotional artwork), and Arby has a beard and mustache and wears a bandanna on his head. They prefer to go barefoot and are never seen wearing shoes.
Fat Jack and Arby usually move slowly and attack by slapping enemies at close range. However, they have a large amount of health and can close with enemies quickly when they charge in with a shoulder tackle.