Quirks: Like always, 80% of the world has a quirk

Visions: Are rare, only 15% of the world has one 

No one can have a vision and a quirk at the same time. (Well... it never happened yet).

Because Teyvat and the world we know, Japan, are basically super far from each other, just pretend that the Miyagi Prefecture is another island in Inazuma, where the Haikyuu! And U.A High kids stay at.

Pretend this is how it looks like: