The Needle, a super-villain from the Golden Age of comics who had the ability to squeeze into narrow spaces to commit crimes, first appeared in Star-Spangled Comics #4 (January, 1942). Created by Jerry Siegel and Hal Sherman, he reappeared several times in hopes of defeating the Star-Spangled Kid.
Here's the attention-grabbing opening page of the Aquaman back-up feature from Adventure Comics #436 (December, 1974).
The Human Bomb was another Quality Comics character later acquired by DC. In this story, published in Police Comics #14 (December, 1942) the explosive hero battled the menacing Mr. Chameleon. The story was written and drawn by Paul Gustavson.