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There are close to none black people where I live, but I guess that most of them are regular people and therefore usually care most for those chuubas that are most popular in countries that have a large black population like the USA or Brazil and don't cater to a certain niche.
Gura for example apparently is watched by many, many small children, I guess this is also why she doesn't get as many supas and is the queen of dead subs in general.
My bet would be Mori just for the fact that she's apparently the most popular in the US for vtubing and Elira and Selen of Niji EN.