I don't feel like they will default because I have seen a lot of characters with dark skin and red hair the color combo's are unlimited in fantasy and creativity. So do what you want to. :) In this case the sky isn't the limit your imagination is. If people can do white hair on ebony skin why not red on dark skin?
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ0jRDFmsWVO4gXB2CJ3WPfjOBsC_ckAgVvPApvg3zJC2YZK6vMcQ
http://e-shuushuu.net/image/?image_id=737303
https://tvtropes.org/pmwiki/pmwiki.php/Main/DarkSkinnedRedhead
I tried to avoid PC garbage as much as possible. Your not going to make everyone happy and people need to stop trying. It adds more stress than it solves. It is a source of anxiety and depression we need not unload on ourselves. This constant question of everything we do and checking ourselves before we wreck ourselves has turned society into a dumb mush pile that really can't think for itself. I'm about to do a social experiment here and I invite you to participate. I'm doing it to prove a point. Anyway, I'll be setting it up in this forum thread so look out for it. It'll be on race.
When doing my own research because I wanted to see how other races describe other races I ran into the Asian almond eyes trope and I have found its a damned if you do and a damned if you don't, their are people who find it offensive as hell and others that don't and find it to be an acceptable descriptive word but also keeping in mind that it isn't a trait all Asians carry. On some of these forums a lot of Asian peoples had no problem with the word and others did so, like I said no matter what you do you can't make everyone happy. It just isn't happening.
Instead of focusing on the PC or how not to offend people I generally go out of my way to just do the research and learn about cultures so I can better represent them in story. Like right now I'm trying to build an Asian inspired culture but no one said it had to be authentic to the T. It's fantasy, maybe I'll decide to intermix fashions from Chinese and Japanese cultures because I like both, or maybe I will add in a twist on another cultures style of jewelry and accent it. The thing is. If you can blend it well and make it believable then everything will be loved just the same. One example is Avatar, it blends a multitude of many cultures in Asia including a few outside of it.
A lot of people nowadays like to scream about cultural appropriation or miss appropriation and I find it stupid and annoying. In ancient times peoples of many cultures would get together to trade wares because it meant sharing ideas, fashion, culture, and brought a multitude of outside wealth to their respective economies. It was about connecting with people and not exploitation of race. (But their will always be exploitation of some kind. Not necessarily race money was what a lot of people wanted to exploit, or technology.)
So how rude would it for me to go around yelling at other races about wearing western cultures clothing? Calling it appropriation? Cause in all reality if they truly cared about culture they would probably get in touch with their roots more and dress traditionally in respect for their own. But who gives a shit about what someone wears anyway? I find it to be a petty argument. (Looking at India on the wedding jewelry here. If you wanted to keep it sacred maybe they should have put that actress in jail for making it a fashion statement. That's my opinion though. If something is sacred and precious those that would do ill will with it even in your own culture should be held accountable for its misuse.)
One other thing I always liked about other cultures is some objects that would seem like everyday objects may actually have hidden meaning and purpose behind them. Like the hair stick which is common in many cultures not just Japanese. Found in Greek and Roman's as well just different styles. Japanese ornament hair stick had served multiple purposes. One being to ward off evil spirits.
So in my mind, in fantasy there really is no default. I just like the story and the characters and that's ultimately what I came for. And as for racial blindness arguments some people make that is racist because to deny genetic differences in people is to deny individuality so embrace our differences its what makes us special.
I'll be naming the social experiment describing race.