Felix the Cat, the new playable character announced alongside the Kickstarter campaign for the game's story mode DLC RULE of Inverse Ninjas, was decided through a Twitter poll. The other three characters on the poll were The Continental Op (a private investigator character created by Dashiell Hammett in 1923 whose copyright expired in 2019), Gnorm Gnat (an insect character created by Jim Davis prior to Garfield who entered the public domain as a result of his original comics not having a copyright notice), and Tarcis the Lover (a joke slot seemingly originating from a dating simulator made by this game's co-developer Trainwreck Studios, and that voting for was actively discouraged by the developers).