Central bankers, because they have not only managed to convince people that they are required in society and are doing good in the world, they actually make the people they install into political parties think they're in charge, when of course, they actually aren't and the rest of the public believe it too.
Central bankers aren't politicians.
I'll shock you with this one, I think the president of the United States is the most powerful politician in the world. They have the most powerful force in the history of the world at their command along with the biggest economy in history at their command.
China is the biggest economy, isn't it? Furthermore, how can you say for sure that the U.S. is the most powerful state in the world from a military point of view? Can it be destroyed? Yes, it can, there are at least two countries which can do just that (with a vengeance), so it can't be the most powerful by definition.
All we know for sure is that the U.S. national debt is the largest on the planet.
Being able to be destroyed doesn't mean you aren't the most powerful. With nuclear weapons, there are many more countries than two that can destroy America (Britain, France, India, Pakistan, Russia, China), but anyone capable of destroying would be destroyed themselves, so they can't be more powerful by virtue of this. With this nuclear stalemate, ability to project traditional military muscle is an adequate measure of a nation's power, and no other country can subject the rest of the world to its military like the US. Just look at the headlines in the last 15 years. We're damned near everywhere and exclusively so.
China is the largest economy from a purchase parity perspective. Economists argue whether this means they're actually larger. I could be convinced either way.