I agree that they should include myths from all over the globe.
Dont quote me on this, but i think a lot of chinese and japanese myths derive from indian mythology too, as buddhism came from india to china to japan, and mythology is often based around religion.
Although i do think the monkey king is a chinese original myth...
I'd personally like to see designs coming from greek and roman mythology, celtic/anglo saxon mythology, norse mythology,egyptian and western asian myths, central asian/indian myths and western asian myths.
The designers are lucky that they get to play around with so much inspiration