『Fatla』

A leviathan woman, Beelzebub's secretary, and Vania's older sister. She and Vania are both shapeshifters, able to assume the form of a gigantic, flying whale. Despite the myth that leviathans are water creatures, they are actually air dwellers, and are usually employed as living transportation(complete with a resort hotel on their backs) by demons, devils and their privileged guests. To fulfill this obligation, both sisters work in tandem: While one does the transport, the other uses the hotel facilities(especially the bath) to relax.