So I've recently come to realise that some posters strongly feel that Valyrian looks/heritage is really really common in all of Essos, which is pretty far from the idea I had. I was certain it was only somewhat common in Lys and the walled-in part of Volantis, and super rare otherwise.
So I thought it would be fun to discuss this as its own topic.
The statistics in my mind would be:
1 valyrian for 1 million westerosi
1 valyrian for 1/4 million essosi
1 valyrian for 10 V