I'm going to attempt to chronologically list all of the Marvel characters Stan Lee had a hand in creating. Working with his genius collaborators, Stan and his team produced an insane amount of iconic characters in a roughy ten year period. (Thread)

With his younger brother, writer Larry Lieber, and Jack "the King" Kirby:

Groot

Tales to Astonish #13 (November, 1960)

With writer Lieber, and artist Kirby:

Fin Fang Foom

Strange Tales #89 (October, 1961)

With the King, Stan gives birth to the Marvel Universe:

The Fantastic Four

Fantastic Four #1 (November, 1961)

With Jack Kirby:

Mister Fantastic

Fantastic Four #1 (November, 1961)