The Gremory Clan is one of the remaining Devil Clans of the 72 Pillars and one of the highest-ranking (ranking at Duke) and famous Devil families. The next head is Rias Gremory, followed up by Millicas Gremory.
The house that produced the current "Lucifer", members of the Gremory Clan are characterized with their red hair color and their powerful Demonic Powers. The Gremory Clan are beings with extraordinary affection among the Devils. As such, they do not discriminate themselves with their servants. The Gremory Clan has a territory that is about the same size as Honshu in Japan, and also has a vast number of castles for its kin. A very rich territory, it also has a developed industry.
In the clan's territory is an area with a well shaded forest and a mountain range filled with high mountains. One of these mountains is taller than the highest mountain in Japan, Mount Fuji, with an elevation extending 4000 meters. There is also a huge lake in this area where Lilitifa Vepar has taken residence.
Underground there is a large training space with a separate training space for Issei, given to him as celebration for becoming a High-Class Devil.
The youngest members of the Gremory Clan have all inherited the Power of Destruction ability of the Bael family. Because of this, it is presently unknown what demonic power ability Zeoticus Gremory and their ancestors possessed, but it is known that the Gremory Family are born with powerful Demonic Powers and have superior control of it as shown by Sirzechs who inherited both the Gremory and Bael's traits.
The clan symbol of the Gremory consists of a rose encased in a circular shape and is crimson in color.
|Runeas Gremory||Founder of Gremory Clan and one of the first Devils created by the Original Lucifer and his wife Lilith.||High-Class Devil||Pure-Blood Devil||Alive|
|Chysis Gremory||The previous head of the Gremory Clan and the mother of Zeoticus Gremory and grandmother of Sirzechs Lucifer and Rias Gremory. At some point in the past, she passed the title of head to her son.||High-Class Devil||Pure-Blood Devil||Alive|
|Zeoticus Gremory||The Current Head of the Gremory Clan and the father of Sirzechs and Rias. At some point in the past, he succeeded his mother Kishisu Gremory as head of his clan. After Sirzechs became the Satan Lucifer, he arranged with Lord Phenex to have their children Rias and Riser become engaged. After the engagement was stopped by Rias’servant Issei Hyoudou, he became more supportive of Rias’ relationship with him.||High-Class Devil||Pure-Blood Devil||Alive|
|Venelana Gremory||The wife of the current head Zeoticus and the mother of Sirzechs and Rias. She was a former member of the Bael clan and is widely known as the strongest woman from the house of Bael of all time.||High-Class Devil||Pure-Blood Devil||Alive|
|Sirzechs Lucifer||The son of Zeoticus and Venelana and the older brother of Rias. He is the husband of Grayfia Lucifuge and the father of Millicas Gremory. Sirzechs participated in the Anti-Satan War with his childhood friends against Old Satan Faction and there he met his future wife Grayfia. After the war, he was chosen to become the Satan Lucifer and one of the Super Devils.||Satan Lucifer (Formerly)
|Rias Gremory||The daughter of Zeoticus and Venelana and the younger sister of Sirzechs. After Sirzechs became the Satan Lucifer, Rias was chosen to become the next head of the Gremory clan and was forced to be engaged with Riser Phenex. She attended Kuoh Academy in the human world of Kuoh Town, which she is currently governing.||Ultimate-Class Devil||Pure-Blood Devil||Alive|
|Grayfia Lucifuge||Wife of the former Satan Sirzechs, the mother of Millicas and the older sister of Euclid Lucifuge. She participated in the Anti-Satan War and there she met her future husband Sirzechs and they eventually got married. After becoming a member of the Gremory clan, she served the household as one of the maids.||Ultimate-Class Devil||Pure-Blood Devil||Alive|
|Millicas Gremory||The son of Sirzechs and Grayfia and the nephew of Rias. He was chosen to be the next head of Gremory clan after Rias.||High-Class Devil||Pure-Blood Devil||Alive|
Issei Hyoudou is viewed as a member of the clan by the staff of the Gremory household and the members of the clan to be a member, with it being formally recognized after he passed the trials at the Ruins of Connection and proposed to her.
The place of ruling for the Gremory clan. It has an underground treasure storage which is the size of several Tokyo Domes (1,509.81 sq ft or 2,013.08 sq ft), divided into sections that stores the payments of the Gremory group for their Devil's work, as well as treasures handed down by the Gremory ancestors. All the treasures are ranked and are sorted by types. There is also a huge theatre where the entrance has a luxurious, decorated door and inside, a giant screen with a 1st floor and lights. The theatre is used to entertain guests; to present something to the audience but it is only used once every few years.
Gremory Mansion (Anime only)
The layout of the mansion's outside is a quadrangle with a courtyard in the middle. Outside at the entrance is a fountain with a circular flower bed surrounding it, with many gardens in the surrounding areas. Inside the mansion, they raise a lot of camels due to them being used in events within areas governed by the clan.
Oppai Dragon Stadium
A stadium specializing in events such as "Oppai Dragon" show performances, which was just built in the castle town of Gremory. At the entrance is a huge statue of Issei in his Scale Mail armor and a huge statue of Rias in the costume of Princess Switch.
In True Volume 2, during the third round of the first round of the "Azazel Cup" main tournament, the teams of Team Red Dragon Emperor of the Blazing Truth and Team Rias Gremory had a match at the stadium. The stadium was fully packed as it hosted the fight between the famous Oppai Dragon and Switch Princess. All the tickets were sold within a a short period of time as the match was highly anticipated. For those who were unable to see the match live, a large number of hyped fans who weren’t able to get into the stadium had gathered around the stadium where large screens were located to watch the live screening of the match.
Gremory Large Enterprise
The Gremory Large Enterprise is a business enterprise owned by the Gremory clan which operates various business ventures in the Underworld as well as the Human world. In the Human world, the Gremory Large Enterprise operates several travel agencies and hotels in various countries such as in Japan; in Tokyo, Kyoto, Osaka and other large cities, each which have hotel chains owned by the Gremory Large Enterprise. The enterprise is also involved in the film industry in the Human world. The current president of the enterprise is Zeoticus Gremory; the current head of the Gremory clan.
It is noted that the members of Rias Gremory's Peerage will be able receive a job at one of the companies owned by the Gremory Large Enterprise, due to being the peerage members of the clan's heiress. The rewards for the Devil job are also treated as part of the Gremory Large Enterprise ventures.
After Issei Hyoudou was promoted to High-Class Devil, he was made a branch manager of the Gremory Large Enterprise and given a third of the territory of Kuoh Town to manage and work as part of his Devil job as a High-Class Devil, under his subsidiary company: the Issei Hyoudou Company.
The Breast Dragon Emperor Oppai Dragon (乳龍帝おっぱいドラゴン Chichiryūtei Oppai Doragon), known as Oppai Dragon for short, is a tokusatsu show in the Underworld, which follows the adventures of the titular character and his partner, the Switch Princess. The show's main character; the Oppai Dragon, is based on Issei Hyoudou, while his partner Switch Princess is based on Rias Gremory; the heiress of the clan. The show is noted to be very popular among the children of the Underworld and has a high viewership, exceeding 50% upon its initial showing. Due to the popularity of the show, it is noted to be a great source of revenue for the Gremory clan.
- In demonology, Gremory (also Gemory, Gamory, Gomory) is a strong Duke of Hell who governs 26 legions of demons. He tells all things past, present, and future, about hidden treasures, and procures the love of women, young and old (but especially maidens). He is depicted as appearing in the form of a beautiful woman with the crown of a duchess tied around his waist, and riding a camel.
- The Gremory Clan's progenitor Runeas Gremory's overall appearance and her companion camel matched Gremory's depiction in demonology.
- One of the characteristics of the Gremory clan is that they are good at hiding riches. It is also said that that the clan excels at grating requests related to love.
- Rias stated that the mountain in which Issei trained with Tannin was going to be called Mt. Issei.
- The Gremory Clan also have an important ruin that has been passed down from generation to generation called the Ruins of Connection.
- It is stated that Sirzechs and Grayfia performed the ceremony at the ruins in the past.
- Rias and Issei Hyoudou perform the ceremony in order to test issei's suitability as Rias' husband, which they passed as Issei was recognized as her future spouse.
- The females in the Gremory Clan seem to have the habit of pinching their husband/lover's cheek whenever they do something embarrassing or silly. This applies to Rias, Venelana, and Grayfia.
- The only Gremory males who don't have a harem are Sirzechs, due to being sealed (formerly because of being a Satan), and Millicas, due to his age.
- The Gremory's have an enterprise called the "Gremory Large Enterprise."
- The mascot of the Gremory clan is Gomorin, which is based on a camel.
- In the English dub of season 2 of the anime, Rias says her family's rank is Marquis even though it is actually Duke.
- In the light novel and manga, the Gremory's live in a castle but in the anime, they live in a mansion.
- The Gremory territory has the Oppai Dragon Stadium which is one of the stadiums for the Azazel Cup, it has the statues of Issei in his Scale Mail armor and Rias in her Switch Princess costume in honor of the Oppai Dragon show.
- As Issei noted all Gremory devil women such as Rias and Chysis are beautiful with large breasts due to hereditary trait from their ancestor Runeas Gremory.