Because you like Ava in Ex Machina

He's the great Black Star, and he's come to assassinate you. See them in Soul Eater.

The main priority for Nagisa Hazuki is making sure that everyone has fun. See them in Free! Iwatobi Swim Club.

Kyoya Ootori is possibly the only person who could reasonably go from VP of a school club to ruling the world. See them in Ouran High School Host Club.