Mr. Garrison
Mr. Garrison was commonly known as "Mr. Garrison" without a first name until the episode "The Entity", where it was revealed as "Herbert Garrison". However, in the episode "Cherokee Hair Tampons", when he wrote his book "The Valley of the Penises", his name on the cover read as "Ethan Garrison", though this may simply be a pen name. As of season 21, he is generally not referred to by name at all, with characters only referring to him as "The President". In Season 23, Randy calls him Mr. Garrison before correcting himself with "Mr. President", reminding viewers that he is still Garrison and not Donald Trump.