Because you like Kara "Starbuck" Thrace in Battlestar Galactica

Elena Gilbert is the quintessential girl-next-door who gets involved with the new "boy" at school. See them in The Vampire Diaries.

When Rin Matsuoka is not swimming, he mostly spends his time brooding or listening to angry Dubstep. See them in Free! Iwatobi Swim Club.

Sid Jenkins is the ultimate underachiever, but he doesn't mind. Well, he pretends he doesn't. See them in Skins.

Maddy Perez seems like an angel until she opens her mouth. See them in Euphoria.

The only defense Earth has against alien invaders are giant robots in the hands of pilots like Kaworu. See them in Neon Genesis Evangelion.

Eren Jaeger will erase the Titans from this world until not a single one remains. See them in Attack on Titan.