TV-Series
Description
The character known as the King of Devils is the ruler of the Demon Realm in the Shuffle! series and the father of Nerine. His true name is Forbesii, and he is a prominent supporting character who serves as a comedic foil to the more serious elements of the story, while also playing a crucial role in the series' world-building.

As the sovereign lord of his realm, he is depicted as a cheerful, flirtatious, and easygoing individual. This personality allows him to quickly befriend the human character Itsuki Midoriba. Unlike the more traditional and reserved King of Gods, the King of Devils is portrayed as being more westernized in his demeanor and lifestyle. He notably enjoys performing household chores such as cooking and cleaning, and he has a preference for informal familiarity, as shown when he asks the protagonist, Rin Tsuchimi, to address him as Papa. Despite his high status, his behavior is often undignified for comedic effect, particularly in his enthusiasm for embarrassing his daughter by bragging about her or pushing her into situations he thinks will please Rin, such as wearing a maid outfit.

The King of Devils shares a deep and positive relationship with the King of Gods, referring to him as a good friend and brother-in-law. This bond is so strong that his wife, Sage, once jokes that their friendship rivals her own romantic relationship with him. He is married to Sage, who originally worked as his maid. Their romance developed when he called off his pre-arranged engagement to a woman named Ai after realizing his true feelings for Sage. Together, they are the parents of Nerine, his pride and joy. His family connections extend further, as his sister is Cineraria, the wife of the King of Gods, making him the uncle of Lisianthus.

His motivations are largely driven by his love for his family and his desire for his daughter's happiness. He, along with the King of Gods, initiates the central premise of the story by presenting Rin with the choice to marry either Nerine or Lisianthus, thereby inheriting the power of the demons or gods. His backstory is further explored in the spin-off game Tick! Tack!, where he appears as a young prince torn between his duty to marry Ai and his burgeoning love for his maid, Sage. Rin aids him in making this critical decision, which determines the future and the identity of Nerine's mother.

Throughout the main narrative, his development is limited, as he functions primarily as a recurring source of comic relief and a supportive father. However, his presence helps to establish the lighthearted and chaotic atmosphere of the series' first half, contrasting with the more dramatic later developments. In terms of abilities, as the King of Devils, he possesses significant authority and presumably immense magical power befitting his title, though the specific nature of his abilities is not detailed in the anime; his role focuses more on his political status as a ruler and his familial relationships.