There’s no single character in It’s Always Sunny in Philadelphia who could stake a claim for the funniest on the show. That’s the beauty of it – every single character in the cast is hilarious; there’s no dead weight. Dennis’ sinister psychopathy, Mac’s combination of homosexuality and devout Catholicism, Dee’s disregard for anyone but herself, Frank’s all-out depravity, and Charlie’s childlike innocence masking a serious dark side all make them hysterically funny characters. But it’s arguably the latter whose characterization makes him the most lovable.