I'm writing a fantasy story, where the four MCs are a human, a dwarf, a dark elf, and a dryad. I know lots of fantasy writing kind of misses the shot on any type of diversity, and I don't want to make the same mistake. For my dark elf, her skin is pure white due to her being a fantasy race, and the dryad is made of wood, so we're good there. However, I'm worried about the human and the dwarf. They aren't really explicitly any race or ethnicity at the moment, because it isn't really relevant to the plot in any way. I personally have certain ways I picture them, but I don't want to do any accidental stereotyping or anything like that. All the cultures are entirely made up, but for ethnicity/race can I just not mention it? If I should mention it, how do I do it organically? Also, please none of that "it's a different world so races are different and it doesn't matter" stuff.