It could be argued that certain deities and powers - like Primus, Asmodeus, Jazirian - are the ultimate embodiments of their respective (Lawful) alignments. They apparently transcend the status of mere greater deities, they are constants in the (Planescape) universe, they impose their will (and alignment) on a vast number of servitors and worlds, they might even get reformed or replaced upon their deaths from the essences of the planes themselves.