Batman an occasional ally and romantic interest), the Penguin, Ra's al Ghul, Two-Face, the Riddler, the Scarecrow, Mr. Freeze, Poison Ivy, Harley Quinn, Bane, Clayface, and Killer Croc among others. Many of Batman's adversaries are often psychiatric patients at Arkham Asylum. Batman's butler, Alfred Pennyworth, first appeared in "Batman" #16 (1943). He serves as Bruce Wayne's loyal father figure and is one of the few persons to know his secret identity. Alfred raised Bruce after his parents' death and knows him on a very personal level. He is sometimes portrayed as a sidekick to Batman and the only other resident of
Batman: Legends of the Dark Knight popularity of these led to the limited series "". The short-lived series "Legends of the DC Universe" was based on the concept of "Batman: Legends of the Dark Knight". But instead of Batman, it featured a rotating roster of other DC superheroes. The "Batman: Mitefall" special used the modern version of Bat-Mite, who first appeared in "Legends of the Dark Knight" #38, to parody the Batman storyline. "Batman: Four of a Kind" chronicles Batman's four first meetings with the Batman villains Poison Ivy, the Riddler, the Scarecrow and the Man-Bat. Those stories were printed in the "Annual"s of the four