As revealed in RJ Jamison's biography "Grayson Hall: a Hard Act to Follow," Grayson was part Rom (Gypsy) as well.
Overall, DS remained a very white show even as time went on and more and more series added African American characters. I can only think of two black actors on DS, and one of them didn't have any lines. Sho Onodera had one episode as Mr. Nakamura and again, maybe two lines?
I thought in the 1990 remake it would have added a lively degree of interest had Angelique been cast with a black actress. (Of course, had a certain storyline been pursued, this would have meant casting David with a biracial actor as well.)
G.