13. The Hulk
via comicvine.com
You may want to avoid getting this one angry. Upon being pushed to his limits, brilliant physicist Bruce Banner transforms into a great green barrage of anger and muscle. His sense of rationale and reasoning is then traded for inhumane strength and invulnerability, which only seems to increase with his rage. He is commonly used as a wild card for the Avengers due to his instability.
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