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What If ...?
Instead of having blonde hair, blue eyes and lighter skin, Captain America has black hair, brown eyes and light darker skin. Instead of being small and skinny turned tall and muscular, Steven "Steve" Wolfe is skinny turned muscular after being injected with the Super Soldier Serum. Captain America possesses super strength, eternal youth and enhanced physical abilities.
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Clone Wars
If Captain America wore Vibranium armor with a detachable jetpack and wielded an energy shield, he would be superior to Iron Man and Star-Lord combined.
If Captain America was cloned, the clone army would be genetically modified to be superior to not just humans but Captain America himself.