I don’t buy the “but Nintendo is a Japanese company and there aren’t any black people in Japan” argument, because almost none of their characters are even Japanese or Asian anyway. Mario, Zelda, StarFox, Kid Icarus, Donkey Kong, none of those games are based on Asian culture. Mario is Italian and Zelda is a European medieval-like world, and only until recently have they incorporated Asian aesthetics into ti.
Pokemon is based on Japanese and Asian cultures, but even then, their characters are almost always meant to look European. Nintendo might not be a Western-“white” company, but they do suffer from the same problems as if they were when it comes to diversity in their teams and products.
They get around the issue by being more dependant on magical and animal characters and worlds lately, so their appeal isn’t hindered by their lack of black, latino, middle-eastern or south asian characters, but Nintendo should consider taking more risk with diversity.