mimicker
/mɪˈmɪsɪkər/Definitions
1. noun
A person or thing that imitates or copies the appearance or behavior of another.
“The ventriloquist was a skilled mimicker, able to mimic the voice of his character flawlessly.”
2. verb
To imitate or copy the appearance or behavior of another.
“The child mimicked his father’s accent, trying to sound like him.”