I am looking to start a roleplay based on Black Bullet and am just assessing interest at the moment. 

"In the year 2021, mankind is ravaged by the epidemic of Gastrea, a parasitic virus, and is forced to live within the Monolith walls, which are created from Varanium: a metal that is able to subdue Gastrea. Soon, children who were born with the Gastrea virus and obtained superhuman abilities as a result, are discovered and dubbed "Cursed Children"

In this case, there will be both males and females who are "Cursed Children", and it has since been 20 years since the outbreak, and those considered "Cursed" have managed to create their own society, hidden, and safe for now. But not for long. 

This is just the basics, as I assess interest!