Man-Bat. Villain? Victim? Stupid?

As an obvious reversal to our hero, the Batman, Frank Robbins and Neal Adams created an actual bat man for Detective Comics #400 (1970). Kirk Langstrom is a scientist, another in a long line of unregulated, crazy, comicbook scientists. Dr. Langstrom studies chiropterology (the study of bats) and specifically their ability to use sonar. He tries to develop a way deaf people can utilize bat sonar, and creates a serum. Naturally, he tests the serum on himself, and things go sideways. Kirk Langstrom turns himself into a human sized bat monster, The Man-Bat. At first, this character is a frenzied wild animal, and Batman has to save the day by finding an antidote. Sometimes, Dr Langstrom is a Jekyl/Hyde character, unable to keep himself from turning into his evil alter-ego. Other times, he's a naive and victimized scientist and inventor that other villains use to build armies of man-bats, or sow public chaos (or both). Sometimes his wife Francine is involved and becomes She-bat. T...