Belphegor is the demon lord of Sloth, one of the 7 Deadly Sins and a member of the Seven Princes of Hell. Belphegor gives people ideas for inventions that will make them rich and thus greedy and selfish. He was known as a phallic deity, associated with sex, orgies, and all forms of debauchery in general.
His most common forms are polarized in their appearances. Sometimes Belphegor is portrayed as a beautiful woman, naked in all her glory, to seduce those who would fall for his wiles, but other times Belphegor is portrayed as a monstrous male demon with leathery flesh, huge horns, long sharp teeth and fingernails and a gaping mouth.
Belphegor is invoked by mortals who wish to find fame and wealth through invention, often with as little effort as possible. These wishes, as with almost any demonic invocation, are doomed to fail, because Belphegor’s true mission is to draw the lazy into the sin of Sloth. Through the failure of whatever Belphegor provided to the invoker, he draws them into procrastination and idle dreaming rather than producing, thus damning them.
As one of the fallen angels, Belphegor was originally a member of the order of Principalities, and after his fall he became a demonic counterpart to one of the ten Sephiroth that oversee the Tree of Life. As a demon, he is described in Kabbalistic writings as the "disputer," an enemy of the sixth Sephiroth "beauty." When summoned, he can grant riches, the power of discovery and ingenious invention. His role as a demon was to sow discord among men and seduce them to evil through the apportionment of wealth.
Belphegor is a lieutenant from Hell, who had been dispatched to Earth on many missions by the devil. Some rabbis claim that he must be worshipped on a toilet, with offerings being the residue of ones' digestion.
Belphegor was the patron of the Moab, a kingdom known to have been along the shore of the Dead Sea, on the eastern side, in what is now Jordan. According to De Plancy's Dictionnaire Infernal, he was Hell's ambassador to France. Consequently, his adversary is St. Mary Magdalene, one of the patron saints of France.
His name is a corruption of Baal-Peor, the name for the god of the Moabites.
Belphegor is an extra boss found in the Lands of Rage, a dungeon which can only be reached if the protagonist has its key, which he receives after returning the lost kid found in Moloch's Temple. After his defeat, the protagonist obtains the Vajra, the best weapon for the partner. He is later fought in the final dungeon, Suzuki Company Ltd., right before Satan.
Belphegor first appears as one of the guard captains in Kamoshida's Palace. He will confront the party immediately after Ann Takamaki awakens to her Persona. He may attack with the Magaru skill and heal himself with Dia. Belphegor is weak to Fire.
The Shadow of Akimitsu Tsuda takes the form of Belphegor during the request Shady Deal in the Shadows and must be defeated in order to complete the Hanged Man ArcanaConfidant with Munehisa Iwai. They can be found in the 4th area of the Path of Kaitul in Mementos. Shadow Tsuda will alternate between using Bufudyne, Mabufula and Evil Smile during battle, and he will follow up with Ghastly Wail to kill party member inflicted with Fear.
Before the story began Phegor was kidnapped and sealed away by the demons of Fire and Light from Muspelheim. The Fake one would later seal away the real Zebul. When Akira defeats the Fake Berith he would express shock and stand in his way to prevent him from meeting the Fake Zebul. After his defeat, he would transform into his true demonic form and disappear. Like the other Fake Brothers, the difference between the real one and fake one is how they look.