Before Dr. Evil was sent back in time to 1969, his minions made him a clone. The clone was similar in every manner although he was one-eighth his size (although Mini-Me is approximately one-third Dr. Evil’s size). Upon being introduced to his clone, Dr. Evil immediately declared, "Breathtaking. I shall call him... Mini-Me."
Mini-Me has almost no spoken dialogue in the films beyond an occasional frightened "Eeeee!". Otherwise, he is silent except for when he does his evil laugh with Dr. Evil. He also likes to lip sync the occasional line when Dr. Evil raps. At the beginning of Goldmember, Dr. Evil asks him to "Use your words like a big boy clone!". At one point, he asks Dr. Evil to hug him after meeting Fat Bastard, who wants to eat him. Mini-Me often uses the middle finger as a means of insulting someone (even though he only uses it once during the third movie). On most other occasions, Mini-Me prefers to express himself through written notes.
Mini-Me has a pet called Mini-Mr. Bigglesworth, which has only appeared once in the series, in which Mini-Me tried to gnaw on his ear. Mini Mr. Bigglesworth is a kitten version of Dr. Evil's cat. Mini-Me loves chocolate and disrespecting Scott Evil, Dr. Evil's son and his rival for affection. He is sometimes referred to and treated as a dog or other small objects. Scott refers to him as "That vicious little... Chihuahua thing", and Dr. Evil illustrates him like a small carry-on luggage, as "he fits easily into most overhead storage bins". Austin says upon Mini-Me being knocked out, "Poor little bugger... he's like a dog or something." In the third movie's opening scenes, Dr. Evil uses a leash to restrain Mini-Me from attacking Scott, saying, "Heel, Mini-Me! Heel!" He also tends to dry hump random things. Nigel Powers, upon seeing him, says "Blimey, I thought I smelled cabbage," thinking he is a carny (referring back to a quip from the first Austin Powers movie). Mini-Me is appropriately confused by the remark.
Despite his small size, Mini-Me is a powerful and effective fighter, once giving Austin Powers a considerable thrashing, until the spy took advantage of his small size and flushed him out into space through a toilet. Despite being a clone of Dr. Evil, Mini-Me is shown to be far stronger and tougher than his larger counterpart, as seen in Goldmember when they're lifting weights in prison. He was also given a significant beating in Goldmember, in which he was tied in a pillowcase by Powers and slammed through shelves and glass tables, only to stand up without a scratch.