Rocket Raccoon

Subject 89P13, better known as Rocket, is a character in the Marvel Cinematic Universe. An enhanced raccoon (though he really does not like to be referred to as a raccoon), he is a freelance bounty hunter who eventually joined the Guardians of the Galaxy.

Early Life
Subject 89P13 was a raccoon who was taken to Halfworld and genetically and cybernetically enhanced to gain sentient intelligence. Over the years, 89P13 became a vain, cocky mercenary named Rocket and joined forces with the Flora colossus Groot.