Leopold Slikk

Leopold Slikk is the main character and the representative subject of 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 Riley and Leopold are established as enemies.

In AGK parodies
Despite being the parodies' main character, there aren't many details of his life that are agreed upon by every parodist. However, it is established that he is German, almost perpetually angry and enjoys playing Unreal Tournament and eating sausage eggs (based on a reversed version of one of his sound clips). In addition, he performs rather poorly academically, and is unable to spell in English to save his life.

In Inside Out parodies
In Riley Andersen vs. the Angry German Kid, the most watched Inside Out parody to date, Leopold is seen chatting with Riley on the Internet. However, due to their countries (Germany for Leopold and Russia for Riley) being on the opposite sides of World War II, Leopold isn't afraid to show his distaste for Riley, and as the conversation does not take any constructive direction, Riley is forced to cut Leopold off, with his reaction being typical: smashing the keyboard while shouting barely intelligible cursewords.

In the Inside Out Kid Series, Leopold is a major character, and seems to be so despite Riley appearing as a main character nominally. His depiction mostly matches that of other AGK parodists, but his surrounding people often defy the clichés of AGK parodies; for example, unlike the other Angry Kids, Riley plays a physical sport, which Leopold has virtually no experience with.

Leopold is also the purported author of a parody known as "riely anturdson sux!!!!!". Per the title, it emphasizes the negative outlook of Leopold toward Riley, in which Riley's emotions, rather than controlling her (a fact that Leopold doesn't appear to be aware of), do everything they possibly can to avoid acting like her.