Because you like Vivian Ward in Pretty Woman
Sephiroth wants nothing more than to seize the power of the Lifestream in order to become a god. See them in Final Fantasy Series.
Frank Reynolds is too gross even for the prostitutes he hires. See them in It's Always Sunny in Philadelphia .
Mikasa Ackerman is a near-perfect soldier who won't break her stone-faced expression whether she's killing foes or protecting loved ones. See them in Attack on Titan.
Edward Elric has a quick mind along with a quick temper. See them in Fullmetal Alchemist.
With each reboot, Janet progresses more and becomes capable of human emotions. See them in The Good Place.
Yuri is living in the afterlife, which takes the form of a high school where no one dies. But if you follow the school's rules and live a "normal" life you vanish. See them in Angel Beats!.
Michael Bluth is the only sane person in a family of eccentrics. At least, that's how he thinks of himself. See them in Arrested Development.
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!!.
Rory Williams is a caring companion whose specialty is looking after others. See them in Doctor Who.
For somebody who won't answer questions, the enigmatic C.C. sure asks a lot of them. See them in Code Geass.
He's a troubled insomniac in search of a moment to rest and a meaning to his existence. See them in Fight Club.