What if the Portugese attempted major campaigns to colonize Japan. It would add Portugal as a faction theyd control one coastal region. There units would be two or three Jappenese militia but most would be Portugese units like musketeers, dragoons, pikemen, and elite Aventuros, also gets large European ships. They have unique structures such as Colonial trading posts and Europeon fortifcations. There strength is much more advanced technology then the Samurai but there weaknes is surrounded by enamies and lack of territories at the start.
So what do you guys think its a bit of a twist hope you like my idea.