Do you want to compare Oya with John Grey? Discover the powers, weakness & weapons of Oya and John Grey from Oya Biography and John Grey Biography. Find out all about Oya and John Grey.# Check out how is Oya unique and distinct from John Grey. Discover their love interest, sidekicks, family tree and the movies and games list in which Oya and John Grey have appeared. Find out everything about them here!