Tyr, the God of War.
He is often over-looked in modern times while Odin is now credited for being the wise warrior. When he is mentioned, it's usually as being the great hero who goes into battle on the side of all that is good.
But what would a god of war really be like?
A being whose chief purpose is to indulge in wholesale slaughter couldn't possibly be too pleasant to be around. Even losing his right hand didn't stop him from indulging in his favorite activity.