noun informal

a person who resembles a smaller or younger version of another person
a person who adopts the opinions or mannerisms of a more powerful or senior person in order to win favour, achieve promotion, etc

Word Origin for Mini-Me

C20: after a character in the 1999 film Austin Powers: The Spy Who Shagged Me
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for mini-me

Contemporary Examples of mini-me