A troublemaker with a heart of gold whose worst habit is retaliating against insults in bizarrely effective ways. He is best known for protecting Commandant Lassard and playing practical jokes on Harris, Mauser, Proctor, Blankes and Copeland, as the five men view Mahoney to be unworthy of being a police officer due to his carefree attitude.

Despite his womanizing and his rule-breaking habit, Mahoney is portrayed as a good and courageous person willing to help those in need, regardless of the consequences. The valor Mahoney displays is likely stemmed from his father, and his graduation with a decoration for bravery speaks to that.