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