Because you like Konata Izumi in Lucky Star
Khan Noonien Singh is super strong, super smart, and out for revenge. He always seems to be two steps ahead of his enemies. See them in Star Trek Into Darkness.
For Sly Cooper, stealing isn't just about the haul. It's also about the journey. See them in Sly Cooper.
Quentin Coldwater has always suspected there was something different about him, and now he has the chance to prove it. See them in The Magicians.
Dante Alighieri is a crusader fighting his way to absolution. See them in Dante's Inferno.
A self-proclaimed diva, Mercedes Jones is on the hunt for a stage worthy of her talents. See them in Glee.
Wei Shen is an undercover cop on a mission for justice (or at least vengeance). See them in Sleeping Dogs.
Joe West is overprotective and secretive when his children are involved. See them in DC Extended Universe.
In the simplest terms, in the most convenient definitions, people consider Brian a nerd. But he's more than that. See them in The Breakfast Club.
How is angel Aziraphale supposed to stop the apocalypse when Hell's forces misplaced the Antichrist somewhere? See them in Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch.
Lucius Malfoy is a judgmental social climber who has a bigoted superiority complex. See them in Harry Potter Series.
Lily Aldrin is a flaky but supportive kindergarten teacher and painter. See them in How I Met Your Mother.