imitator

ˈɪmɪteɪtə

noun

someone who copies the behaviour or actions of another.

the show’s success has sparked off many imitators

copier,copyist,emulator,follower,mimic,plagiarist,ape,parrot,echo,copycat,epigone,impersonator,impressionist,mimicker,parodist,caricaturist,lampooner,lampoonist