Name: Jimmy Olsen
Other Names: James Bartholomew "Jimmy" Olsen; Elastic-Lad; Mister Action
First Appearance: Action Comics (vol. 1) #6 (Nov. 1938): "Superman's Phony Manager"
Super? (Has Super Powers/Special Abilities/Technology): Yes
Number of Appearances: 1,896
Comic Book Appearances: 1,602
TV, Film Appearances: 291
Video Game, Computer Game Appearances: 3
Teams/Affiliations: The Legion of Super-Heroes
Enemy of: Amun
Worked for: The Daily Planet
Note: Superman's pal
Identifying Jimmy Olsen's "first appearance" is slightly complex. He first appeared briefly as an unnamed office boy working at the Daily Planet in Action Comics #6. His appearance there already featured some of his trademark characteristics.
But Jimmy Olsen's first "definite appearance" (in which he was identified by name) was in Superman (vol. 1) #13 (Nov.-Dec. 1941), in a story later referred to by archivists as "The Archer." In this story, the character is referred to as "Jimmy." His last name ("Olsen") would not be revealed until two issues later, in Superman #15.
However, these Superman comics are not really Jimmy's first named appearance. Jimmy appeared as a character, identified by name, before Superman #13 in the serialized "Superman" radio program.
Suggested links for further research about this character and the character's religious affiliation: