Honestly, I just love that Lanuvel is so supportive of him regardless of what he does. He definitely needs someone like that in his life considering his twisted view on things and loner tendencies.
@Kurbo For 10 years he ventured on a journey to kill the demon king he was surrounded by comrades with horrible personalities of their own. Of course he invested another horrible personality of his own after that. It's the influence of the environment.