Hi Diddle Riddle

Main/Featured Characters

 * Dynamic Duo (first appearance)
 * Batman (Bruce Wayne) (first appearance)
 * Robin (Dick Grayson) (first appearance)
 * Alfred (first appearance)
 * Gotham City Police Department (first appearance)
 * Commissioner Gordon (first appearance)
 * Chief O'Hara (first appearance)
 * Inspector Basch (first appearance)

Villains

 * The Riddler (first appearance)
 * Molehill Mob (first appearance)
 * Harry (first appearance)
 * Molly (first appearance)

Other Characters

 * Aunt Harriet Cooper (first appearance)
 * Moldavian Prime Minister (first appearance)
 * Newscaster (first appearance)
 * Doorman (first appearance)
 * Mr. Harris (first appearance)
 * Gideon Peale (first appearance)
 * Bruce Wayne's Father (first appearance) (mentioned)
 * Bruce Wayne's Mother (first appearance) (mentioned)

Organisations

 * What a Way to Go-Go (first appearance)
 * Peale Art Gallery (first appearance)

Objects

 * Batmobile (first appearance)
 * Batphone (first appearance)
 * Batcuffs (first appearance)
 * Bat-Hook (first appearance)
 * Bat-Signal (first appearance)
 * Batcomputer (first appearance)

Weapons

 * Batarang (first appearance)

Locations

 * Gotham City (first appearance)
 * World's Fair (first appearance)
 * Republic of Moldavia Pavilion (first appearance)
 * Peale Art Gallery (first appearance)
 * Gotham City Police Headquarters (first appearance)
 * Gotham City Hall (first appearance)
 * What a Way to Go-Go (first appearance)
 * Mole Hill Mob Headquarters (first appearance)
 * Wayne Manor (first appearance)
 * Batcave (first appearance)
 * Moldavia (first appearance) (mentioned)

Trivia

 * The Moldavian Prime Minister speaks in German instead of the areas native language, Romanian.