Rising Sun is a mod for Mount & Blade: Warband based on the Gekokujo mod, New Update 2022 released. Set during the late Bakumatsu and Boshin War periods of Japan (1866 - 1869). Fight to restore the Imperial Court or retain the Tokugawa Shogunate.
The Royal Marines known as the Royal Marine Light Infantry at the time were the British amphibious light infantry who served in many colonial conflicts. They will be an elite unit and will probably only be recruit-able by Imperial Domains and Clans. (B&I II Base Uniforms)
FOR QUEEN AND COUNTRY!
Here's an idea, perhaps have colonial recruitment offices in major Imperial city's, or perhaps colonial outposts outside them where plays might recruit these colonial soldiers. These offices/outposts could perhaps be either tied to a specific faction or perhaps be independent, with the only way one might be able to recruit them/perhaps even any kind of foreign soldiers is by increasing ones reputation with said faction by carrying out missions, fighting for either side etc. The Last Days of the Third Age does something similar and I think this would be a really great way to ad some flavor into the game! If this idea where to be taken up, I'd also suggest perhaps adding them in as mercenaries at inn's, but perhaps limit their number to VERY, VERY, VERY few and have them cost an arm and a leg hehe :P