Because you like Izzie Stevens in Grey's Anatomy

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.

L is enigmatic, child-like, and one of the smartest people in the world. See them in Death Note.

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.