colorims?
you mean colorism?
lol i had to search
if you're talking about colorism, and are referring to the lack of black/tan representation in a lot of the manga's, its not necessarily because they're tan/back, more because ost are plotted in East Asia, and its rarer for there to be black/tan people in asia vs east Asians. Otherwise, i personally have never seen it in a manga, but im sure a lot of them out there especially the older ones
most*
I will just say this once and I know there will be probably lol that will explain me why this and that.... But can they stop doing colorims