yeah but he was also a real guy, William Adams. British guy who got to Japan in the 17th century, was one of only two survivors of a ship from Europe. He got appointed as an advisor type samurai to the shogun for ten years because the shogunate wanted western style boats.

Also Nioh has you fighting wizards and giant frog monsters and stuff. It's awesome but I never once heard gamer types complain about historical inaccuracy.

White samurai is kinda popular trope ever since Clavell wrote Shogun, and to be fair it did happened once or twice too.

Main character of the first is William Adams, a fictional irishman who became a samurai, named after a real englishman who became a samurai. Japan, or at least Team Ninja, seems to have something of a love of foreigners who became samurai.