Iron Man

Despite the fact that Stan Lee came up with the idea for a “quintessential capitalist” hero and many of the traits which have stuck with Iron Man over the years, he didn't actually write the story in Tales of Suspense #39 which introduced Tony Stark to the Marvel Universe.

The writer was juggling so many books at the time and he was forced to hand over writing duties to Larry Lieber, so it was him along with artists Don Heck and Jack Kirby who all played a key role in the character's creation.

The latter two are actually credited with coming up with the look of Tony, his armour, and the majority of his supporting cast too.