Because you like Mary Crawley in Downton Abbey
Ellie is more world-weary than most 14-year-olds. You would be too if your world was infested with zombies. See them in The Last of Us.
The son of Death has an obsession with perfection and symmetry. See them in Soul Eater.
When the going gets tough, Rick Grimes gets tougher. It's a very useful trait when the world goes to hell. See them in The Walking Dead.
While he might be too cool for school, Soul isn't too cool to do the right thing. See them in Soul Eater.
An exuberant prankster, Naruto Uzumaki craves acknowledgement of any kind. See them in Naruto.
Ciel Phantomhive is a haughty teenage nobleman who doesn't suffer fools gladly. See them in Black Butler.
L is enigmatic, child-like, and one of the smartest people in the world. See them in Death Note.
Few high school students could be less concerned with labels. See them in Ouran High School Host Club.
Armin Arlert was wrong. This world hasn't become hell; it's been hell. He just couldn't see it before. See them in Attack on Titan.
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.