Names: (Batman Comics 008, 1941) It was on brand for the Joker to use the aliases “A. Rekoj” and “I. Rekoj” in the last year but I am pretty upset that Batman just used “I. Namtab” and that the Joker fell for it.
(Blue Beetle Comics 008, 1941) In the Dynamo story he goes up against a guy who calls himself the Crime Dealer, a good name for a bland guy.
Riddles: (Batman Comics 007, 1941) “When is a Duke not a Duke?” Answer: the Joker is impersonating a Duke.
One of the more brutal on-panel deaths I have seen:
(Blue Beetle v1 006, 1941)
Two gun-wielding boys I encountered in a short period of time:
(Action Comics v1 033, 1941)
(Bulletman 002, 1941)