Vin Diesel is one of Hollywood's most legendary tough guys. He has anchored The Fast and the Furiousfilm franchise decades now, and can find every variation on a single line as Groot in the Guardians of the Galaxy series. He was one of the most bankable action stars of the 2000s, notching starring roles in big-budget projects like 2002's XXX, and trying his hand at an Arnold Schwarzenegger-style pivot into family fare with 2005's The Pacifier. But in between these blockbuster franchises and stand-alone projects, Diesel kept coming back to one particular character.