“It's not our business to debate whether Kira is good or evil. We just have to catch Kira. If Kira is caught, he is evil. If Kira rules the world, he is justice.”

— Light Yagami ("Justice")

Light Yagami (夜神月, Yagami Raito) is the main protagonist of the Death Note series. After discovering the Death Note, he decides to use it to rid the world of criminals. His killings are eventually labelled by the people living in Japan as the work of "Kira."