Suggested by Destroyer Copperhead has good agility and a solid amount of Venom. If he lands a good hit on most fighters then they may feel the effects for a while but Hedorah is virtually immune to poisons so he won’t be having any trouble here. A good poison punch will take Copperhead out and while he is fast I don’t think he would be able to dodge Hedorah for very long. He’s definitely going down in the end. Hedorah wins.