Why did not powerful shogun or general ever consider toppling the emperor and making himself the new monarch of Japan? You see this kind of thing happen across China, Byzantium, Francia, Germany etc.... So, what made the Japanese imperial family so resistant to replacement?
I'm on mobile, so not sure if the link goes to where it should, but:
Variations of your question are the most commonly asked type of question about premodern Japan here.
Go to the Asia-section in the FAQ and read what seems relevant under the Japan, Politics and Religion heading. If there is anything specific that you feel is missing, feel free to post a follow-up.
https://reddit.com/r/AskHistorians/w/asia?utm_source=share&utm_medium=android_app
Hey there,
Just to let you know, your question is fine, and we're letting it stand. However, you should be aware that questions framed as 'Why didn't X do Y' relatively often don't get an answer that meets our standards (in our experience as moderators). There are a few reasons for this. Firstly, it often can be difficult to prove the counterfactual: historians know much more about what happened than what might have happened. Secondly, 'why didn't X do Y' questions are sometimes phrased in an ahistorical way. It's worth remembering that people in the past couldn't see into the future, and they generally didn't have all the information we now have about their situations; things that look obvious now didn't necessarily look that way at the time.
If you end up not getting a response after a day or two, consider asking a new question focusing instead on why what happened did happen (rather than why what didn't happen didn't happen) - this kind of question is more likely to get a response in our experience. Hope this helps!