Many of Marvel's usual superhero artists and writers contributed to the effort over the years. Crazy originally featured a short, bug-eyed mascot with a large black hat and draped in a black cape, who may not have had an official name. Another early mascot, Irving Forbush, was a squat character who wore a saucepan over his head with eyeholes cut out of it. Later in Crazy's run, these characters were replaced with the belligerent Obnoxio the Clown.
For other notable imitators, see MAD Magazine.