Johnny DC
Johnny DC was a character that appeared in various Silver Age DC Comics advertisements, and was used to promote DC's line of comics.
The mascot consisted of a cartoonish face wearing a mortarboard, with stick figure lines for his arms and legs, and a body that was the DC Comics logo of the time.
In the mid-1990s, Johnny DC appeared in the satirical special Sergio Aragones Destroys DC; there, he's shown as having become disillusioned with the modern direction of DC's superhero comics, criticizing the various members of the Justice League and accusing them of having changed for the worse.
A female version of the character appeared in Ambush Bug as "Jonni DC, Continuity Cop", who found Ambush Bug's casual violation of DC Universe canon perpetually frustrating.
In 2004, Johnny DC was revived and given a makeover, with his name now also used as the name of DC Comics' children (approximately ages 8-13) oriented line of comics, consisting of various licensed properties such as The Batman Strikes!, Teen Titans Go, Scooby-Doo, Looney Tunes, and The Powerpuff Girls. The lettercols of these titles are supposedly edited by Johnny.