>>719004621
It's because Japanese media is focused on the performative fiction aspect, there's no reason to seek verisimilitude because it's not actually real. Hair styles and skin colours are part of the performance.
Like, this hair style is physically impossible. It looks like this from every angle, even ignoring how it defies gravity, but it can do that because this is fiction. It's two dimensional, it shouldn't have to worry about three dimensional constraints.