Because you like Amy Pond in Doctor Who
A fight every now and then makes Dante's life a little more interesting. See them in Devil May Cry.
Given his ability to wrench street signs from the ground, Shizuo Heiwajima is a useful one to have in dangerous Ikekuburo. See them in Durarara!!.
This thrill-seeking driver lives by a very particular moral code. He stands by his word and he's loyal to a fault. See them in Drive.
When Rin Matsuoka is not swimming, he mostly spends his time brooding or listening to angry Dubstep. See them in Free! Iwatobi Swim Club.
Cheerful, childlike, and easily jealous, fashion icon Misa Amane is smarter and crueler than she seems. See them in Death Note.
Wearing couture pinstripe suits over his cut abs, banker Patrick has a way with the ladies. But his relationships never end well. See them in American Psycho.
For somebody who won't answer questions, the enigmatic C.C. sure asks a lot of them. See them in Code Geass.
Whatever Sakura Haruno lacks in power, she makes up for in intelligence and bravery. See them in Naruto.
Jenko was top dog in high school. Now he's bottom of the pack in the police academy. See them in 21 Jump Street.
Annie Walker can bake a beautiful cupcake, but everything else in her life is a mess. See them in Bridesmaids.