Tbh there's just a lot of them in general of light x dark haired. It's rarer to see light x light or dark x dark haired
It's even worse for more abnormal colors like red, green, orange, pink etc. I've been reading for years and it still feels like I only can name a few. It seriously sucks. Why does everyone only have black/brown/blonde hair .? At most the "craziest" it gets is white TT

tears of happiness in my eyes as i see ppl complaining about/disliking dark haired bottoms/light haired tops yall have finally come to light