After its renovation, it also became the home for almost all the current and former female members of the Occult Research Club, the female members of the Vali Team: Kuroka and Le Fay Pendragon, the Princess of the Kyoto Youkai: Kunou, envoy of the Camilla faction: Elmenhilde Karnstein, the angel Lint Sellzen and the Dragon God: Ophis, and her spawn: Lilith.
The Hyoudou Residence was originally a normal two-story terrace house with a light blue exterior, a balcony on the second floor, and a brown roof. It would later be renovated by the Gremory Clan in Volume 5 of the light novels into a large, six-story house with three large basements.
- First Floor: Includes the living room and kitchen.
- Second Floor: Includes Issei's room, Asia's room, Rias' room, Issei's parents' room, and a bathroom.
- First Floor: Includes guest rooms, the living room, kitchen, a bathroom, and Japanese-styled rooms (washitsu).
- Second Floor: Includes Issei's, Rias', and Asia's rooms, with Issei's room being in the middle. It has two interconnecting doors on each side: one connecting to Rias' room and one connecting to Asia's room.
- Third Floor: Includes Issei's parents' room, a study, and a storeroom.
- Fourth Floor: Includes Akeno's, Xenovia's, and Koneko's rooms.
- Fifth Floor: Not much is known about the fifth floor as of yet, probably includes Irina's, Rossweisse's and Ravel's rooms.
- Sixth Floor: Originally an empty floor, the top floor was converted into a meeting room for the Three Factions (also known as the VIP Room).
- Rooftop: The rooftop is a communal garden decorated with flower plots and there is a small vegetable farm planted. There is also a table and chairs to drink tea at. The rooftop is also home to Ophis' shrine which is located at the corner of the rooftop, which she can use for sunbathing.
- First Basement Floor: Includes a movie theater, training rooms, changing rooms, and a large indoor bath which has a refrigerator filled with three different flavors of milk (fruit milk, regular milk, and coffee milk). A hidden room on this floor also becomes Kuroka's and Le Fay's room. The second hidden room also contains an assortment of baths of various sizes, but are noticeably larger than the first and are decorated gorgeously with ornate patterns, tropical plants, Dragon statues pouring water into the bath, and the Gremory's symbol.
- Second Basement Floor: Includes a heated indoor swimming pool.
- Third Basement Floor: A mostly vacant floor that is generally used for storage. It also includes a library.
All floors in the renovated house are accessible via an elevator. There appear to be hidden rooms in the residence due to the designer of the house having a fondness for hidden rooms. Two of such are located in a corner that leads to a dead end on the first basement floor and at the corner of the bath. The other hidden rooms have yet to be discovered.
Before the renovation, Issei's room was 8 tatami-mats wide. After the renovation, it was stated to be twice as large with it containing a new model flats-screen TV and the latest kinds of game consoles.
Shrine of Ophis
A small shrine erected on the rooftop of the Hyoudou mansion for Ophis, the "Dragon God," after Chapter 3. A 400-year-old cedar tree that had been broken by a natural disaster was used as the building material, and with the help of Kunou and others, it took two days for the Gremory family to build it. Instead of komainu (lion-dogs), statues of the Two Heavenly Dragons were placed, and the money placed in the money box is used as pocket money for Ophis. The divine power is not generated so much because the divine rituals are simplified so as not to adversely affect devils, but lightning strikes in protest from Heaven when impure wishes are made, as seen when it struck Azazel for making malicious wishes and Issei for making disreputable wishes.
|Gorou Hyoudou||The husband of Miki Hyoudou and the father of Issei Hyoudou; the current Red Dragon Emperor, as well as the foster father of Asia Argento. He is a ordinary office worker. He has the appearance of a middle-aged man with brown hair and brown eyes who wear glasses. It is noted that Issei greatly resembles him.||Human||Alive|
|Miki Hyoudou||The wife of Gorou Hyoudou and the mother of Issei Hyoudou; the current Red Dragon Emperor, as well as the foster mother of Asia Argento. She is a full-time housewife. Miki has the appearance of a middle-aged woman with dark brown hair that is tied into a ponytail and hazel eyes.||Human||Alive|
|Issei Hyoudou||The son of Gorou and Miki Hyoudou as well as the grandson of Juzo Hyoudou and his wife. He is a third-year high school student at Kuoh Academy. He possesses the Longinus; Boosted Gear, which makes him the current generation's Red Dragon Emperor. Issei is the Pawn of the Gremory Peerage and the King of his own independent peerage.||Reincarnated Devil||Alive|
|Asia Argento||A third-year high school student at Kuoh Academy in Class 3-B and is a girl with a very gentle heart. She was formerly one of Rias Gremory's Bishops but now serves as Issei's first Bishop. Asia started living in the Hyoudou Residence due to her desire to be closer to Issei as his parents started treating her as their own daughter.||Reincarnated Devil||Alive|
|Rias Gremory||One of Kuoh Academy’s Two Great Ladies and a first-year college student at Kuoh Academy. She is the heiress of the Gremory clan and King of the Gremory Peerage as well as Issei's master. After Issei saved her from her forced engagement, she fell in love with him and moved into the Hyoudou Residence in order to deepen her relationship with him.||Pure-Blood Devil||Alive|
|Akeno Himejima||One of Kuoh Academy’s Two Great Ladies and a first-year college student at Kuoh Academy. She is Rias's Queen as well as her best friend. Akeno moved into the Hyoudou Residence after the Three Factions peace conference, due to Sirzechs Lucifer's suggestion to deepen the relationships between the members of Rias' peerage.||Reincarnated Devil||Alive|
|Xenovia Quarta||A third-year high school student at Kuoh Academy in Class 3-B and a former exorcist. After learning the truth of God's death, she was excommunicated from the Church and decided to join the Occult Research Club as Rias' second Knight. After Issei's promotion, she now serves under him as his first Knight. Xenovia moved into the Hyoudou Residence after the Three Factions peace conference, due to Sirzechs Lucifer's suggestion to deepen the relationships between the members of Rias' peerage.||Reincarnated Devil||Alive|
|Koneko Toujou||A second-year high school student at Kuoh Academy and a member of the Occult Research Club. She is a Nekoshou, a rare species of Nekomata and Rias Gremory's first Rook. Koneko moved into the Hyoudou Residence after the Three Factions peace conference, due to Sirzechs Lucifer's suggestion to deepen the relationships between the members of Rias' peerage.||Reincarnated Devil||Alive|
|Irina Shidou||The Ace of Archangel Michael and Issei's childhood friend. She left Japan and went to England with her family to be trained as a Exorcist, where she became friends and partners with Xenovia. After the peace treaty was formed by the Three Factions, Irina became a Reincarnated Angel under Michael’s Brave Saints and became a student of Kuoh Academy as a representative, as she began living in the Hyoudou Residence.||Reincarnated Angel||Alive|
|Rossweisse||A Valkyrie assistant of the former chief-god of Norse, Odin. She was persuaded by Rias into becoming her servant when she looked at the Gremory summary papers and was amazingly fascinated by the huge amount of money. After Issei became a High-class Devil, Rias traded her to become a member of his peerage. She began living in the Hyoudou Residence after becoming Rias' servant.||Reincarnated Devil||Alive|
|Ravel Phenex||A second-year high school student at Kuoh Academy and a former member of Riser's peerage, who was traded to her mother, Lady Phenex before being traded to Issei Hyoudou, becomes his servant and second Bishop. Ravel began living in the Hyoudou Residence in order to deepen her relationship with Issei after falling in love with him.||Pure-Blooded Devil||Alive|
|Ophis||The Dragon God known as the Ouroboros Dragon and the Infinite Dragon God, who was the former leader of the Khaos Brigade. After the Demonic Beast Riot, she started to live in the Hyoudou Residence due to considering Issei her friend as well as her protection due to her prior association with the Khaos Brigade.||Dragon||Alive|
|Kuroka||A Nekoshou, a rare variant of Nekomata, and a member of the Vali Team previously affiliated with the Khaos Brigade, now a part of Team DxD. She is a former SS-Class Stray Devil, one of the most wanted criminals in the Underworld, and currently serves as Xenovia Quarta's Bishop. She began homestaying in the Hyoudou Residence after the Demonic Beast Riot and began officially living in there after the DxD team was founded.||Reincarnated Devil||Alive|
|Le Fay Pendragon||A witch who is a descendant of Morgan le Fay and the legendary King Arthur, as well a member of the Vali Team that was previously affiliated with Khaos Brigade, now a part of Team DxD. She is a first-year high school student at Kuoh Academy and a member of the Occult Research Club, as well as being Issei Hyoudou's contracted magician. She began homestaying in the Hyoudou Residence after the Demonic Beast Riot and began officially living in there after the DxD team was founded.||Human (Magician)||Alive|
|Kunou||A nine-tailed princess and a first-year middle school student at Kuoh Academy. She moved into the Hyoudou Residence due to wanting to grow closer to Issei and her desire to attend school at Kuoh Academy.||Kitsune||Alive|
|Lilith||The spawn of Ophis created from the power that Samael stole from her, who was considered as Ophis by the general populace due to the real Ophis defecting to Issei. After Qlippoth's downfall, she was entrusted to Issei and the people who were living in the Hyoudou Residence due to them taking care of Ophis.||Dragon||Alive|
|Elmenhilde Karnstein||A Vampire Princess from the Karnstein family and agent of the Carmilla Faction as well as a member of Issei's Team Red Dragon Emperor of the Blazing Truth. She moved into the Hyoudou Residence after joining Issei's team.||Pure-Blooded Vampire||Alive|
|Lint Sellzen||A exorcist who is a member of the Vatican and Heaven's Brave Saints as an Extra Joker. Lint is a former member of Rias Gremory's Azazel Cup Rating Game team; Team Rias Gremory, filling in the spot Xenovia Quarta left as her Knight. She moved into the Hyoudou Residence after joining Rias' team.||Reincarnated Angel||Alive|
|Ingvild Leviathan||A descendant of the original Leviathan and the Queen of Issei peerage. She moved into the Hyoudou Residence after becoming Issei's servant.||Devil/Human Hybrid||Alive|
- Rias' father; Zeoticus Gremory, suggested making it into a palace, but Rias talked him out of it.
- The Hyoudou Residence was reconstructed to be sturdy enough to withstand a war.
- Bennia compares the Hyoudou Residence to Shangri-La.
- The renovated house was designed by a designer who is sponsored by Ajuka Beelzebub, who also happens to be fond of creating hidden rooms in houses just like Ajuka, as it is hinted that there might be even more hidden rooms or unknown factors hidden in the house.
- One of the features demonstrated is the ability for the garden to split open and function as gate to exit the mansion.
- The Hyoudou Residence serves the base for the Rias Gremory Peerage and the Issei Hyoudou Peerage.
- The Hyoudou Residence also serves as a meeting place for the various supernatural VIP's.
- With the exception of his mother, the Dragon God sisters (Ophis and Lilith) as well as Lint, every female living in the Hyoudou Residence is in love with Issei.
- Issei and his father Gorou are the only permanent male residents.
- Issei's father is only allowed to use the bathroom in the first floor.
- In the manga the first encounter between Asia and Issei's parents (Ch. 11) is in a washitsu-like room, while in the anime they first meet in the living room. This makes it possible that a Japanese-styled room (washitsu) was already present before the renovation by the Gremory Clan.
- Light Novel Volume 2
- Light Novel Volume 4
- Light Novel Volume 6
- Light Novel Volume 8
- Light Novel Volume 10
- Light Novel Volume 14
- Light Novel Volume 22
- Light Novel Volume 23
- Light Novel Volume 24
- True Light Novel Volume 2
- Light Novel Volume 5, Life.1 It's summer break, let's go to the Underworld!
- Light Novel DX.2, Life 4
- Light Novel Volume 15, Episode Issei.1
- Light Novel Volume 17, Life.0
- True Light Novel Volume 2, Middle Game