Harold Slikk

Harold Slikk is Leopold Slikk's father in Angry German Kid parodies. As such, Inside Out parodies, featuring another prepubescent child (namely Riley Andersen) as a central character, have a significant potential for crossover, and in particular, the Inside Out Kid Series, in addition to featuring a bond between Riley and Leopold, shows another bond forming between their parents.

In AGK parodies
Most commonly, it is agreed that Harold should be portrayed using Leopold's voice pitched down in voice and the "Bad day" viral video in physical form. This gives him a characterization centering about a violent nature and a boring office job in which he lashes out on his work computer. In addition, another object of his violent nature is Leopold himself, who is frequently given groundings and beatings by Harold.

In Inside Out parodies
In the Inside Out Kid Series, Harold is briefly featured with not much difference from his role in AGK parodies. At first, he threatens Leopold to go to school, and then, is not seen in the first episode until the end, where he is eating dinner with Riley's parents (using the Dinner Table Scene, where he substitutes for Riley). It is shown that Harold and Riley's parents get along surprisingly well.