Maou

This powerful demon serves as the final antagonist in a game Nagi is experiencing. She is bound to a chair within her tower fortress and commands a talking skull named Gaikotsu, which punishes her for interfering with the protagonists. The character attempts to trap heroes from the outside world using a unique fishing rod to send them to the underworld, often referencing "Ultima." She has also featured as a quiz game host and in supplementary materials.