Käthe Jägerman witnessed her family's brutal slaughter by vampires in her youth, leaving her deeply traumatized with a disdain for the supernatural. She taught herself how to hunt monsters, devoting herself to protecting her fellow humans and seeking vengeance against monsters. She hides her 'night job' from everyone she knows, during the day working at the animal shelter. She has a monotone tone and expression. Käthe, who is autistic, finds solace in her special interests: guns and dogs.