I wouldn't think to much on hair colors, either way you'd have to think that the Hojo family in Higurashi was from north Europe descent (and i don't wanna guess what the Sonozaki family is supposed to be).
Usually in anime and such you see various hair colors but that's only for aesthetic purpose and you are supposed to imagine they are actually all black (same thing with the eyes). However it's been stated that Beatrice is blonde. It is still not enough to be 100% sure that the Beatrice we see on the portrait, and the consequently the metaBeatrice, appears as a western woman. It could be a japanese woman who died her hairs.
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Also in Christian believes it is the color of danger
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It's not just christian belief. Red as color of danger/passion/rage is embedded in our DNA, because that's the color of blood. that's why emergency lights, traffic lights (for stop) are in red (worldwide regardless of cultures). Red is a color that has a very high chance of attracting one's attention.