Because you like Ted Wiggins in The Lorax

Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.

After surviving consecutive fights-to-the-death (damn you, President Snow!), Katniss Everdeen is thrust to the front lines of a real war. See them in The Hunger Games .

Castiel might be an immortal angel, but the human world is still more than a little confusing. See them in Supernatural.