While we encounter many morally questionable characters within Undertale, none of them are truly evil, so to speak. Asgore was forced to make a decision he never wanted to make, Flowey can't control himself, and Chara is a mystery beyond explanation. Still, there's no denying that something evil exists within the game--how else is something as morbid as the genocide path possible? The answer isn't 'the player', but something much more compelling...