Because you like Wolfgang Amadeus Mozart in Amadeus
Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.
Connor Walsh is arrogant enough to think he's the smartest guy in the room, and quick-witted enough to prove that he is. See them in How to Get Away with Murder.
Free-spirited Annie Hall goes through life saying "La-di-da, la-di-da, la la." See them in Annie Hall.
Margaery Tyrell is one of the most adept and charming liars there is. See them in Game of Thrones.
Michaelangelo is an above-ground crime-fighter by night, and a pizza-eating, sewer-dwelling mutant ninja turtle by day. See them in Teenage Mutant Ninja Turtles.
Sarah Kerrigan is pretty much the Queen Bitch of the Universe. See them in StarCraft .
Kenzo Tenma would have never guessed that ten-year-old he saved would later become a deadly serial killer intent on "thanking" him. See them in Monster (TV Show).
Although life in a post-apocalyptic world is far from easy, Julie Grigio maintains her sense of humor. See them in Warm Bodies.
Michael Kelso gets by on his good looks and his openhearted nature. See them in That '70s Show.