WordNet sense 1 (a representation of a person that is exaggerated for comic effect):

caricature, impersonation

WordNet sense 2 (a copy that is represented as the original):

counterfeit, forgery

WordNet sense 3 (not genuine or real; being an imitation of the genuine article):

fake, simulated, false, faux

WordNet sense 4 (contrived by art rather than nature):

artificial, unreal