Unfortunately, CK3 isn’t a one-to-one historical sim
The idea of an Emperor being a monarch with subservient Kings is mostly associated with the Holy Roman Empire, where the Empire had multiple kingdoms beneath it- in pretty much every western context, “emperor” 9/10 times is just a monarch who considers themselves an heir to Rome- the Russian Tsars, the German Kaisers, and the French Empires, all follow this line of thinking.
In Asia, Emperor as a translated title is just the best way to refer to the monarch of a large and diverse nation- and the Japanese monarchy very closely mirrors the Chinese one, and if China has an Emperor, than Japan shall too.
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