Source: vertigocomics.com

11. The Confessor

(Astro City, Vertigo)

Astro City is maybe the best overall comic book of all time. If you like superheroes and haven't read it, you truly need to.

The book's second trade, Confession, followed new Astro City resident Brian Kinney, who found himself recruited by the mysterious defender of the night, The Confessor. Brian was brought on as Altar Boy, and learned how to fight crime in the city’s Shadow Hill neighborhood, where the monsters dwelt.

HUGE SPOILERS! DON'T KEEP READING UNLESS YOU WANT THIS RUINED FOR YOU! However, The Confessor had a deep dark secret. He was a vampire. Yup, that was where his spooky superpowers came from. But when there was an attempt to governmentally register magic heroes, and Confessor went on the run, Brian discovered that the whole thing was masterminded by shape-shifting aliens. Aliens who knew Confessor's secrets. And used them to kill him.

But not before he exposed their true identities, and set Brian up to become the new man of the night. The second Confessor!