Suggested by Destroyer Kakuzu is a pretty tricky Naruto opponent who is hard to destroy since he has more than one heart. One of his monster clones has fire jutsu so Pyro should be pretty safe against him, but the fire villain will still get overwhelmed in the end. Kakuzu simply has too many options and he is also a deadly hand to hand fighter even if you don’t count his spirits. His super strength will allow him to beat Pyro in a few hits. Kakuzu wins.