The True Demon King In AOT

At first Kira seemed like a normal human; he went to school, had friends and a loving family. But he was anything but normal, for him; this wasn't enough. In his opinion Earth was boring, a place where he would never be satisfied. So when he died and awoke in a world, a world he knew, a world of fiction, he was excited and finally felt alive, because in this world he could finally do something worthwhile. For example, taking over the world, or destroying humanity.