So I'm gonna own right off the bat that this isn't my original idea but something that I've seen brought up a lot of times in things like history TIL threads. With that out of the way, I do feel like brainstorming this a bit more.
That's right: samurai in Mexico.
2.) Cebuano shaman
3.) Japanese ronin
4.) Chinese merchant
5.) African escaped slave
6.) Aztec priest(ess)
7.) Sephardic Jew
All of them could speak at least passable Spanish and have some relevant skills to make them good party members.
"Rodríguez discovered that about one-third of the people sampled in Guerrero, the Pacific coastal state that lies nearly 2000 kilometers south of the U.S. border, also had up to 10% Asian ancestry, significantly more than most Mexicans."