Dennis 'Denny' O'Neil comic
In 1975 the Clown Price Of Crime became the very first villain to gain his own ongoing series. "The Joker" lasted only 9 issues, focused on the Rollicking Rogue's various misadventures and criminal endeavors. Each issue saw The Joker face not only heroes but fellow villains as well.
Also popular was O'Neil's recommended reading list featured in the letters column that featured a wide variety of fiction and non-fiction.
It will prove to be one of Batman's most challenging adventures as a new hero joins the Dark Knight's continuing cast of characters in BATMAN: SWORD OF AZRAEL. Azrael is the enforcer for the secret Order of Saint Dumas, a society whose existence dates back to the time of the Crusades. When this bullet-riddled angel of death crashes into the midst of a Gotham City parade, Batman is drawn into the mystery of Azrael, launching them on a quest that leads both Batman and the young Azrael to Europe where they separately investigate the systematic slaying of the members of the Order of Saint Dumas.
Azrael was an ongoing comic book series published from 1995 - 2003, focusing on its title character, the alter ego of Jean-Paul Valley. After the debut of Azrael in the Batman: Sword of Azrael miniseries and the character's subsequent role in Knightfall, Azrael was given his own series. Starting with issue #47, the title was changed to Azrael: Agent of the Bat to emphasize his role as a member of the Batman Family.