The full scope of Imu's abilities are unknown, but the fact that Imu sama sits on the Empty Throne, a seat whose occupant would be associated with sole authority of the entire world, and the fact that the Five Elders, who are publicly considered to be the highest authorities of the World Government bow before them and address them with a great honorific, would indicate that Imu has the greatest known authority within the World Government. The woman is very unknown and the leader of the world.