Menacing Mammal Manhunters: Man-Bat & Super-Chief

Zoologist Kirk Langstrom studied the nocturnal gliders which the Batman modeled his crimefighting career after, and developed a bat extract to improve his failing vision. With this chemical compound, he became the eerie Man-Bat of Earth-One. Initially, Langstrom's inhuman alter ego was bestial, and a menace which the Batman confronted repeatedly until helping Kirk to produce an antidote to his transformations. At this point, Kirk's psyche stabilized, and he used his Man-Bat identity as an on-again, off-again hero of Gotham City.

Hunter-warrior Flying Stag was a young member of the Wolf Clan during the 14th century in North America on Earth-Two, who aspired to be the supreme chief of the Iroquois nation. However, some of his rivals conspired against him, and trapped him in a pit. Therein, Stag found a Kryptonian meteorite, imbuing him with superhuman abilities and made him think he had seen a vision of Manitou, whom he served and whom he believed directed him on a mission to protect their people while keeping his identity secret. 

Eventually, following his fiancee Francine's brief foray as a She-Bat, Kirk married and settled down to a new career as an amateur private detective. Working alongside professional investigator Jason Bard, Langstrom lent the aid of Man-Bat to their cases, while also assisting other members of Batman's Family including Robin and Batgirl. On one occasion, the three heroes combated the evil persona of Bruce Wayne's butler Alfred Butler, the inhuman Outsider... who briefly transformed Kirk into a were-cat hybrid creature.

 While Flying Stag did not become a human-animal hybrid like Man-Bat, the bison-masked hero’s meteor-enhanced  metabolism granted him swift flight and comparable superhuman strength to that of Man-Bat. However, Super-Chief only possessed these superpowers for one hour per day, whereas Langstrom manifested these abilities until ingesting the antidote to his bat-extract and reverting once more to a human.

After initially consuming his bat extract, Langstrom temporarily turned insane and became a recurrent foe of Batman, before his hero turned adversary found a way to reverse  the process and return Kirk to his human state. For a time, as Man-Bat he was a protector of New York City. Unfortunately, madness would once more consume him reverting him to an enemy of Batman.

As the hero Saganowhana, which in English is translated as Super-Chief, Flying Stag was a fearless fighter while concealing his true identity in a mask. Eventually, Super-Chief was thrusted from his old west era into the 20th century of his native Earth-Two during the Crisis on Infinite Earths. What became of him after assisting several other time displaced champions following this tale is unknown. However, it was implied that he might have remained in the present day, perhaps continuing on in his heroic identity in 1985, or perhaps through time warps created by the Crisis journeying to 1942. If so, he filled a roll that post-Crisis would be filled by his Earth-Eight counterpart Flying Fox, as an auxillary member of the All-Star Squadron alongside Firebrand whom he earlier faced.

There were other creatures on their respective worlds. On Earth-One, there was Andrew Bennett, Lady Viper, Anthony Lupus and Gregori Arcane who each mirrored Earth-Two's Creature Commandos in Vincent Velcro, Myrna Rhodes, Warren Griffith and Elliott Taylor.

While the former quartet each interacted with the Batman on their Earth, there is no documented occurrence of the later foursome having met their own Batman, since they operated primarily in Europe during World War II before they were jettisoned into space accidentally on a last mission.