Blue Devil is a superhero appearing in American comic books published by DC Comics. He first appeared in a special insert published in Fury of Firestorm #24. That story led directly into Blue Devil #1, also cover dated June 1984. He was created by Dan Mishkin, Gary Cohn, and Paris Cullins. The Blue Devil comic book ran for 31 issues and one annual. Blue Devil later appeared as a regular character in Shadowpact which ran for 25 issues.
Blue Devil #1 (June 1984), cover art by Paris Cullins.
Blue Devil as he appears in Justice League Unlimited.
DC Comics insert previews
DC Comics insert previews were 16-page comic book stories inserted into issues of existing DC Comics series to promote new series usually debuting the next month. Running from 1980 to 1985, they consisted of a front cover, 14 pages of story, and a back cover that depicted the cover of the actual first issue. The addition of the insert did not entail an increase in the price of the comic book, and the cover copy called the insert "a special free 16-page comic!"
First page of The New Teen Titans insert preview, from DC Comics Presents #26 (Oct. 1980), art by George Pérez and Dick Giordano.