Cornwallis is one of Mr. Hankey and his wife's three children. He is at first unable to understand how he fits into the Christmas and is depressed until his father sings him a song about how poo is everything. His father later admits he wrote the song to get him to 'quit his bitching'. He teaches his father to believe in himself again.
- "No, it wasn't a stupid song. Because you showed me that I have the power and the strength to do anything I want." (A Very Crappy Christmas)
- A Very Crappy Christmas (s04e17)
In a side-quest in the Sewers, the player meets Mr. Hankey only to find out the nuggets are missing and must search for and rescue them in order to gain Facebook requests from the entire family.