Heaven and Hell decided in 1988 that the children of the world would be judged before they died. This results in things like horns, tails, wings, and sometimes even halos appearing on people ages 16 and under, as of the year 2004. Some will also gain additional abilities, such as mimicry, enhanced speed and strength, and in extreme cases, even auras of fear have been seen. Almost all sinners and saints (as they've begun to call themselves) are significantly stronger than a regular human, so schools will often have a student to enforce rules and regulations.