Sideshow Bob

Robert "Bob" Underdunk Terwilliger Jr., better known by his stage name, Sideshow Bob, is a self-proclaimed genius, member of the Republican Party, champion of high culture, former children's entertainer turned criminal mastermind and Bart Simpson's arch-nemesis. He loves Gilbert and Sullivan Operettes and has huge feet.

In HTF form, Sideshow Bob appears to be a yellow mongoose.