Because you like April Kepner in Grey's Anatomy
Pro: Johan Liebert is handsome and charming. Con: he's also a sociopathic killer. See them in Monster (TV Show).
Light Yagami has a plan to make a better world, and morals won't stop him. See them in Death Note.
Other people's opinions have never mattered much to Haruka Nanase, and they aren't going to start to do so now. See them in Free! Iwatobi Swim Club.
While he might be too cool for school, Soul isn't too cool to do the right thing. See them in Soul Eater.
A fourth grader without a moral compass, Eric Cartman lives on KFC, Taco Bell, Pizza Hut, and Cheesy Poofs. See them in South Park.
Edward Elric has a quick mind along with a quick temper. See them in Fullmetal Alchemist.
A powerful dragon-hunting warrior, Dovahkiin is destined for great things. See them in The Elder Scrolls V: Skyrim.
When you live your life in public, like Mima Kirigoe, it's hard to know who you really are. See them in Perfect Blue.
Eren Jaeger will erase the Titans from this world until not a single one remains. See them in Attack on Titan.
An aloof punk rock goddess, Nana Osaki has a surprisingly big heart. See them in Nana.
Courteous, dangerous, and powerful, Kaname Kuran controls an entire court of vampires. Very, very pretty vampires. See them in Vampire Knight.