And that's why we stan Elma.I’ll give you Joker and Ryu, as they obviously are Japanese, however I would still maintain that many characters still could pass as Caucasian, be it art style or otherwise. That said, Marth and Roy previously speaking Japanese suggests they are of a Japanese-equivalent origin in their home games as well.
When looking at characters of color outside of Asian background, it would appear it’s a somewhat difficult commodity to ascertain in terms of “gaming character that is not only non-white or non-Japanese, but is a protagonist/mascot”.
In terms of what we might consider “eligible” for Smash, it’s rather difficult unfortunately.