The former commander of the now defunct 6th Squadron of the Demon Slayers. As Kafka surveyed the region of Bariura， she exhumed many research materials left behind by the Bariura Empire. She was even able to gain many materials specifically from old facilities that researched demonic techniques， and saw her power grow along with her findings. It is thanks to the knowledge she acquired， as well as that of Rhoa， that the Summoners' Research Lab was able to be established. However， the bad blood the feud between the two different squadrons created still survives there in the form of cliques.