Batman of Zur-En-Arrh is a character appearing in media published by DC Comics. Introduced in the Silver Age, the character is an alien named Tlano from the planet Zur-En-Arrh who decided to become a version of Batman for his own planet. The character's reappearance in the 2000s rebranded him as a violent and unhinged backup personality of Batman, but the alien version has been revealed to still exist in the main continuity.

Bat-Mite is a fictional character appearing in American comic books published by DC Comics. Bat-Mite is an imp similar to the Superman villain Mister Mxyzptlk. Depicted as a small, childlike man in an ill-fitting copy of Batman's costume, Bat-Mite possesses what appear to be near-infinite magical powers, but he actually uses highly advanced technology from the fifth dimension that cannot be understood by humans' limited three-dimensional views. Unlike Mxyzptlk, Bat-Mite idolizes his superhero target and thus he has visited Batman on various occasions, often setting up strange and ridiculous events so that he could see his hero in action. Bat-Mite is more of a nuisance than a supervillain, and often departs of his own accord upon realizing that he has angered his idol.