iirc only Dean Thomas, Angelina Johnson, and Cho Chang are the only nonwhite students that get a mention in the books

There was a Patel something too. Which actually made sense since there is a significant Indian minority in England, having been their colony for hundreds of years.

That said, it made sense for a British school in the 2000's. There would probably be one or no minorities from England's colonies at a prestigious school in the 1890s. And any that were there, would primarily be a token to show how magnanimous their British masters are in civilizing the lower races. White Man's Burden and all that, old chap. I doubt that's a subplot this game would like to explore.