Man-Bat

Man-Bat was a creature created by Langstrom through splicing and an enemy of Batman. Dr. Kirk Langstrom was a biologist specializing in bats. He had hoped to extract bat DNA to give human beings sonar as a cure for deafness. When he tested the serum on himself it did cure his deafness but it also turned him into a human/bat hybrid. Losing his basic human senses he went on a rampage in Gotham until stopped by Batman. Coming to like the power of his Man-Bat form. He took the serum again and gave some to his wife Francine Lagstrom, turning her into She-Bat. They attack Gotham together but were again stopped by Batman. However he does not seem to do intentional evil, because on occasion when he maintains his intelligence in his Man-Bat form he has done good. Examples include helping detective Jason Bard, and once helped Superman overcome kryptonite poisoning. Kirk and Francine had two children named Becky and Aaron. Aaron was born in a Man-Bat form due to lasting effects on Kirk and Francine's DNA.