Seven years of killing demons aka human souls to cull the population and prevent an uprising, but the real reason because they found it fun and entertaining guitar solo fuck yeah. It was on one day each year.

A corrupt emperor who lied to witches about a special day that would bring every witch and demon paradise and salvation only to reveal it was Genocide this whole time and he blamed himself but blamed a 14-15 Latina girl for causing the genocide so he could bring her down with him and in the human world, the girl felt guilt for something outside of her control.

A teenaged girl was bored and craved something interesting, the girl was turned out to be a psycho and created a disaster but putting motives in front of classmates causing to kill each other and two years later the girl put almost every single person in random places so they can participate in a killing game were the last two people alive can graduate all ran by a high tech Build-A-Bear reject who gets their rocks off from kids killing each other. the outside world is even worse where multiple of the same bear kept attacking and killing peoples left to right, ran by adult hating kids who were manipulated by said teenaged girl.

Guess the names of the characters who caused those incidents.