Mack Walker

Mack was the black repairman hired to fix Hank's water heater in the Season 7 episode "Racist Dawg." Ladybird bit him which led to some rumors about Hank and Ladybird being racist. This changed though when the Hank hired a white repairman and Ladybird bit the white man. It was later determined that Hank wasn't racist, it was just that Ladybird sensed Hank's distaste for repairmen causing her to bite them.