HeartBreakers

In the world of HeartBreakers, death is not always the end. 

For the longest time, this wasn't the case. The world and its rules were very much identical to our own. Earth was earth, death was death. However, recently, that has changed. On rare occasion, in the face of death, an individual can, instead of dying, gain something known as a Heart instead. This Heart, a gem-like object embedded into its owner's chest, replaces the individual's literal heart, and grants the individual powers based on who they are and the circumstances of their death. 

Our main characters are such people. Using their newfound powers, they've decided to turn to a life of crime fighting, using their abilities to fight off other, less morally scrupulous Heart users, and maybe even save the world!

This one's a superhero story that starts out as a monster-of-the-week affair and then ends up getting more and more serious as time goes on.