Well, Helheim with their Hanged Kings and guarding the Gates of Death leaves few to be desired in this respect.
But when I am feeling in mind for some intrigue, I play Tien Chi.
Shinuyama - they are goblins!
And what's not to like about them. I once played them in heavily RP/AAR game with Pretender whose dynasty had lost the throne of Tien Chi some time ago. Now he had forged a (relatively) disciplined army out of goblins whom he had taught to make steel weapons and grow rice enough to feed their troops and was going to come back for a throne rightly
his. Initially he had made an alliance with Tien Chi so that people and officials there would know him...