Odin, the All-Father. Modern day versions of Odin portray him as a wise, kind, and benevolent ruler of Asgard.
But seriously, does that sound like the kind of god that Vikings would respect?
Legends tell us that he sacrificed an eye in order to know the future. How heavy the burden of knowing what the future holds must be! One might even try to prevent the inevitable, even if it means doing some truly nasty things.