Batman and Iron Man
[ranking: 11]
Similarities: Egotistical billionaires (one who's always, one who dons it as a facade) who use their wealth to build a suit and many toys to fight crime.
Batman first appearance: Detective Comics #27 in May 1939Iron Man first appearance: Tales of Suspense #39 in March 1963
Dr. Fate and Doctor Strange
[ranking: 5]
Similarities: Sorcerers/doctors who wield powerful amulets to fight the evil doers of the magic worlds.
Dr. Fate first appearance: More Fun Comics #55 in May 1940Doctor Strange first appearance: Strange Tales #110 in July 1963
Elongating Man and Mister Fantastic
[ranking: 4]
Similarities: Stretchy, elastic-y super geniuses.
Elongating Man first appearance: The Flash #112 in May 1960Mr. Fantastic first appearance: The Fantastic Four #1 in November 1961
Thunderbolts and Suicide Squad
[ranking: 7]
Similarities: Teams of villains disguised as heroes with a... flexible sense of right and wrong. Both walking the line between good and evil on a case by case basis.
Thunderbolts first appearance: The Incredible Hulk #449 in January 1997Suicide Squad first appearance: The Brave and the Bold #25 in September 1959
Aquaman and Namor
[ranking: 2]
Similarities: Arrogant, brash, not well liked, undersea titans who rule their own kingdom with smarm and charm.
Aquaman first appearance: More Fun Comics #73 in November 1941Namor first appearance: Motion Picture Funnies Weekly in April 1939
Catwoman and Black Cat
[ranking: 1]
Similarities: Black latex clad cat-thieves who commonly gets romantically involved with their sometimes enemy/sometimes ally.
Catwoman first appearance: Batman #1 in Spring 1940Black Cat first appearance: The Amazing Spider-Man #194 in July 1979
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