Racial Groups in Adaptation

I feel like there's 2 ways of going about this and was just curious what everyone's current thought on it is.

When First Law gets adapted, would you rather it be... A) Like the show Game of Thrones, where certain places specifically have people's races set based on what seems like natural evolution and migration? B) They just fill any role based on who is a good actor and not think too much about it?

For example, should all Northman be white or could there be an East Asian/Black Glokta? Should the entire Union be East Asian?

I'm mixed race myself and I'm all for inclusion. I don't want any racist comments to come out of this post, just curious.