Because you like Rebecca Bloomwood in Confessions of a Shopaholic

Whether she's working as a mild-mannered assistant or an all-powerful superhero, Kara Danvers is defined above all by her huge heart. See them in Supergirl.

John Watson is haunted by his past (who isn't) but he's starting to branch out with some help from a world class detective. See them in Sherlock.

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