They have a similar appearance to their son. Percy's mom has dirty blonde hair, and wears a green dress and dark green shoes. Percy's dad has a mustache, and wears a grey suit with a tie and black shoes. He's shown to be balding.
- "Dinner Party"
- "The Forgotten" (Mr. Dahmer)
- "Rough Riders Elemantary" (Mr. Dahmer)
- "Goldfish Follies"
- "Water Park"
- "The Interrogation" (Mother Mentioned)
- "Time Crimes" (Father only)
- "Clarence and Sumo's Rexcellent Adventure" (Mother Mentioned)
- "Have a Ball" (Mrs. Dahmer only)
The gallery for Mr. and Mrs. Dahmer can be found here.