Because you like Bill Haverchuck in Freaks and Geeks
Eren Jaeger will erase the Titans from this world until not a single one remains. See them in Attack on Titan.
With his own ship, Peter Quill calls his own shots, and gets to fly from planet to planet blasting '70s pop hits and picking up alien chicks. See them in Marvel Cinematic Universe.
Howl puts the "tortured" in tortured artist. He just wants to be recognized for his work, but no one wants to trust a boy that sorta looks like a bird. See them in Howl's Moving Castle.
John Locke is an eerily calm, confident believer in the magic of the island that gave him his legs back. See them in Lost.
Marty McFly is a skateboarder, aspiring rock star, and reluctant time-traveler. See them in Back to the Future.
It is a truth universally acknowledged that Elizabeth Bennet doesn't suffer fools or prideful men. See them in Pride & Prejudice.
Dominic Toretto lives his life "a quarter mile at a time", and he burns through those miles faster than anyone. See them in The Fast and the Furious.
Tyler Gage is going to have to step up soon on the dance floor. Otherwise, it's back to janitorial work. See them in Step Up.
If there's power in being average, Mikado Ryugamine will find it and use it. See them in Durarara!!.
Given his ability to wrench street signs from the ground, Shizuo Heiwajima is a useful one to have in dangerous Ikekuburo. See them in Durarara!!.
For Dana Scully, sometimes looking for extreme possibilities makes you blind to the probable explanation right in front of you. See them in The X-Files.
