Evil Rakshasa - Horse-Headed Gokusotsu

The Last Word of Yuugi Hoshiguma from the world of iron and steam (a Touhou LW original). She rules over paradise with her knowledge from Hell. With her background as an oni and the way she uses her ability as a guard of Hell, she directly manages the New Land of the Oni, which was built as a single colossal contraption of steel. Unlike human civilizations, where lots of people rule with different levels of authority, the two Nio share all the authority between them. Their spiritual civilization's infrastructure is efficient and provides a high standard of living thanks to the Nio bearing this impossibly heavy responsibility on their massive shoulders.