Because you like Don Draper in Mad Men

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

An ironic hipster with a healthy dose of self-deprecation, Dave strives to be cool at all costs. See them in Homestuck.

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

After becoming accepted into the group of popular girls, Tracy Freeland has turned from a sweet and reserved teenager into a monster. See them in thirteen.

More than any of her friends, Fluttershy is willing to see the best in everyone, a trait that has won over many enemies. See them in My Little Pony.