What drives a man to hunt humans in a short story?There are various reasons. Maybe he believes humans have caused irreparable harm to the environment or society. Or perhaps he's had a traumatic experience that's warped his view of humanity. Another possibility is that he's under the influence of some cult ideology that dehumanizes others.
Who could be the opponents that make Naruto go insane in a 'naruto goes insane fighting' fanfic?The Akatsuki as a whole could be the opponents. Imagine Naruto facing multiple Akatsuki members at once in a fight. The combined threat of their different powers and their goals of capturing the tailed beasts could be overwhelming for Naruto. They might use underhanded tactics, like threatening to kill captives or using mind - control techniques on Naruto's friends. All of these things could make Naruto go insane as he battles against them, trying to protect what he loves.