This isn't, strictly speaking, a question but more a gathering of general knowledge regarding these two periods. I'd like to make a comic, game or whatever taking place in a fusion between these two periods of history. You know, samurai sheriffs, ninjas robbing trains, the whole nine yards. Any knowledge that may prove useful to me?
hi! you may be able to mash up some of the material covered in these sections of the FAQ
Ninjas, Samurai, and related errata - particularly this post by /u/AsiaExpert The respective roles of Ninja and Shinobi
How historically accurate are "Wild West" tropes? may remind you of more of those tropes