Deathnote
Deathnote is an anime about a guy named Light Yagami who is granted the ability who write down names and whatever he writes down comes true. Light wanted to help the city by eliminating those he felt were criminals. His idea was if he created death for criminals that the world would be a much better place. His father is a cop, and the city tries to find out how people are getting mysteriously murdered. Light has to hide from his father that he has been the one writing down these names. The one person who wants to get to the bottom and starts to catch on Light, led by enigmatic detective L. L begins to catch on to Light, but throughout the seasons they go back and forth.