Kevin Duffman is the father of Amanda Duffman. Despite their limited ability to communicate, due to the fact that he is only newly learning ASL, he deeply loves his daughter and wants to protect her. He went from relying on his wife to care for Amanda to becoming a single father after his wife's death. Kevin comes across as strict but he is in fact easily manipulated by his daughter, as shown when she manages to trick him into allowing her to adopt Togo.
The character Kevin Duffman is portrayed by actor Andrew Jackson.