Mammon is a term, derived from the Christian Bible, used to describe material wealth or greed, most often personified as a deity. In the Bible, Mammon is personified in Luke 16:13, and Matthew 6:24, the latter verse repeating the former. In some translations, Luke 16:9 and Luke 16:11 also personify mammon; but in others, it is translated as 'dishonest wealth' or some other equivalent. In some Spanish versions, it is referred to as "Mamón", but in others, it is "Dinero" (Spanish for "money"). Later demonological writings such as De Plancy's Dictionnaire Infernal attributes Mammon as Hell's ambassador to England. For Thomas Carlyle in Past and Present, the 'Gospel of Mammonism' became simply a metaphoric personification for the materialist spirit of the nineteenth century. Mammon is also one of the Seven Princes of Hell, each representing the Seven Deadly Sins (Lust, Gluttony, Greed, Sloth, Envy, Anger and Pride). Mammon represents Greed.
In a cave referred to as "the gates of Mammon", he guards the entrance. He will only let the hero pass if he gives him Pazuzu's head. He gives him Bael's Claw in order to enter Pazuzu's lair in Shinjuku. When the hero returns with Pazuzu's head, he will fight the hero regardless of his decision to give it to him or not.
A demon lord who rules one of the worlds of Makai. He reveals to Setsuna Kai and Mirai Kaname that their father is Lucifer and that he met them when they were babies. Voiced by Akira Ishida in the PlayStation version.
Mammon is Kunikazu Okumura's shadow, representing his greed and fixation on ascending into the political world so much so that he is willing to sacrifice his own company, his employees, and even his own daughter as stepping stones to do so. Unlike most other bosses in the game that represent one of the Seven Deadly Sins, he does not transform into a monster.