The split personalities of Edward Norton's character in "Fight Club" and Jim Carrey's character in "Me, Myself, and Irene," are very similar but can be contrasted as easily as cinema-graphic lighting and a laugh track. In trying to compare and contrast these characters, one thing that helped me is deciding which of these split personalities I would rather have. .
Jim Carrey's character in "Me, Myself, and Irene" is an all around nice guy. Everybody in town knows him and is well liked by everyone. Charlie gets pushed around a lot and no one takes him seriously, this is were Hank arrives. Hank, Carrey's split personality arrives when all the emotions of being pushed around and his wife leaving him finally come out and it happens to come out as another person. Hank basically is the guy that doesn't take anything from anybody and if he has a problem with something he lets you know about it. .
Edward Norton's character in "Fight Club" is the average "Joe." The 9 to 5 desk job, an apartment furnished entirely by IKEA and Pottery Barn. He says, "I had become a slave to the IKEA nesting instinct. If I saw something like the clever Njurunda coffee tables in the shape of a lime green Yin and an orange Yang, I had to have it. The Haparanda sofa group with the orange slip covers by Erika Pekkari. The Johanneshov armchair in the Strinne green stripe pattern. The Rislampa/Har lamps from wire and environmentally friendly unbleached paper. The Vild hall clock of galvanized steel. The Klipsk shelving unit. I would flip and wonder, "What kind of dining room set *defines* me as a person?"" This sums his character up totally, a person completely unable to create a personality free of what commercial trends tell him he should be. A man so devoid of personality he isn't even given a name. It is his "normalcy" which causes his insomnia, and in the end the "man" known as Tyler Durden. Tyler is his split personality, completely free of inhibition, damning anything and everything with a trademark or commercial endorsement.