The Extra Demons are the houses of top-class Devils who are not a part of the 72 Pillars. Currently, most of the Extra Demons have secluded themselves from the current Devil Society, not wanting to involve themselves with the government.
- Mephisto Pheles is the only member of the Extra Demons who doesn’t have a clan and has been active since the time of the original Four Great Satans.
- The clans of Lucifuge, Satanchia, Agaliarept, Fleurety, Sargatanas and Nebiros are known as the Six Houses of Lucifer as they served the Lucifer Clan.
- The clans of Mammon and Belphegor are the names of the devils associated with the Seven Deadly Sins.
- It is stated that if a member of a Extra Demon household wants to participate in the Rating Games, they have to cut ties with their household.