copycat

US /ˈkɑː.pi.kæt/
UK /ˈkɑː.pi.kæt/
"copycat" picture
1.

a person who copies another's behavior, dress, or ideas

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She's such a copycat, always wearing what I wear.
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The police suspect a copycat in the recent string of crimes.
:
imitatormimicemulatorfollowerplagiarist
1.

to copy or imitate someone or something

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Don't just copycat my ideas; try to be original.
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The new product seems to copycat its competitor's design.
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imitatemimicemulatereproduceduplicate