Trying to attract certain dwellers

Nothing racist about having a theme(especially if you look at the lore behind the game), but no there is no way to do this.

There are tool online that u can use to change your dwellers (including skin color).

but if you want to do it without cheating the only way is to restart the game a few times and try to get as many dwellers of your preferred skin as you can. If that's not an option due to loss of progress your only solution would be to "breed it out".