
Please remember these are all Asian mangas we're reading thus technically even though they look white most of our characters are actually asian, that's just the state of things, secondly, unlike much of the rest of the world Korea/Japan/China etc do not have a very multicultural community thus are not generally going to cater to such, it's not a racism thing it's just reality, when almost 99% of your population is generally one race you are going to most likely cater to that.

It's called colorism and it's super prevalent in Asian culture. Also racism does exist in places like Korea against Chinese, Indian, and other Asian nationalities lol. Korean comedy shows still use blackface and cultural appropriation as funny gags regularly. Just because YOU don't personally see it doesn't mean it doesn't exist.
Me: Sees beautiful woman of color.
WOC: Dies and is reincarnated into a white lady.