Minor characters in High School DxD.
- See also: Gremory Clan Servants
- 1 72 Pillars
- 2 Satan Clans
- 3 Extra Demons
- 4 Other Devils
- 5 Stray Devils
Lord Bael (バエル卿, Baeru Kyō) is the current head of the House of Bael and the father of Sairaorg and Magdaran, the husband of Misla and an unnamed second wife, and the younger half-brother of Venelana. According to Magdaran, Lord Bael is extremely prideful even for a Bael and never showed any sort of fatherly love towards his sons, as he was greatly angered with his elder son Sairaorg for not born with the clan's Power of Destruction. Despite being the Head of the Bael Household, Lord Bael has never made a single decision on his own without consulting the First Generation Bael, Zekram Bael whether it was political or familial matters.
This caused Sairaorg to be scorned and shunned and the same discrimination was directed to his wife, Misla, just the same for being the one who birthed a "failure" in his eyes. He married his second wife and had his second son Magdaran, who was born with the clan's trademark, but wasn't as talented as Sirzechs and Rias and was very displeased when he was defeated by Sairaorg for the title as the next head.
Additionally, he did not think highly of Magdaran's passion for plants and his remarkable achievements in botanical research while many Devils commended Magdaran for being able to revive extinct plants and cultivating rare fruits. Lord Bael considered Madgaran's achievements in plant research as a shameful action and sternly warned him instead of praising him. Lord Bael is also a very jealous man as according to Zekram, aside from Sairaorg, he also has a strong hatred towards Issei as he is the strongest among the young Devils and the rising star as Oppai Dragon in the Underworld, garnering popularity and fame despite him being a reincarnated Devil.
Lord Agares (アガレス卿, Agaresu Kyō) is the current head of the House of Agares and the father of Seekvaira. He was one of the 72 Pillars clan leaders who joined to form the Anti-Satan Faction during the Devil Civil War. He is noted to be a skilled diplomat as he meditates the political disagreements between the Great King Faction and the Four Great Satans's supporters. He is worried that his daughter's mental fortitude may be crushed due to the pressure of assuming the role of Archduke, so he taught her to relax by watching mecha anime.
Lord Sitri (シトリー卿, Shitorī Kyō) is the current Head of the Sitri Clan. He is the father of both Serafall and Sona. He was one of the 72 Pillars clan leaders who joined to form the Anti-Satan Faction during the Devil Civil War, telling Zekram Bael that Serafall was unhappy with the Satans' children and that she would likely fight on their side in case of a civil war. At some point in the past, he had arranged an engagement for Sona to marry, but she was able to call it off after beating her suitor in a game of chess. In True Volume 4, he fell into a coma due to suffering from the sleep disease, thus forcing his daughter Sona Sitri to quit her position as a member of Team DxD so she could become the Head of the Sitri Clan.
Lady Sitri (シトリー・夫人, Shitorī Fujin) is the wife of the Lord Sitri and Mother of Serafall and Sona. Not much is known about her aside that she is best friends with Rias Gremory's mother; Venelana Gremory.
Lord Astaroth (アスタロト卿, Asutarotto Kyō) is the former Head of the Astaroth Clan. He is the father of Diodora. He was one of the 72 Pillars clan leaders who joined to form the Anti-Satan Faction during the Devil Civil War, telling Zekram Bael that although Ajuka wasn't interested in politics but that he did feel threatened about how the children of the Satans' were doing things and that he considered how his powers would affect the Underworld. Due to the revelation of his son's affiliation with the Khaos Brigade, he was forced to step down as Head of the Astaroth Clan as they lost the right to produce the next Satan candidate.
Lord Glasya-Labolas (グラシャラボラス卿, Gurasha-Raborasu Kyō) is the current Head of the Glasya-Labolas Clan. He is the father of Iryuka. He was one of the 72 Pillars clan leaders who joined to form the Anti-Satan Faction during the Devil Civil War, telling Zekram Bael that although Falbium seemed indifferent about the matter, if push came to shown he would take action if his Clan asked him to.
Lord Phenex (フェニックス卿, Fenikkusu Kyō) is the current head of the House of Phenex and the husband of Lady Phenex, as well the father of Ruval, his unnamed second son, Riser, and Ravel. He is stated to resemble his children; having blond hair and blue eyes. He had made an agreegement with Zeoticus Gremory for his son Riser to marry Zeoticus's daughter Rias; the heiress of the Gremory clan. After the engagement was canceled due to Issei Hyoudou's actions, Lord Phenex told Zeoticus that he didn't mind as he was happy that Riser experienced defeat due to the fact that he overestimated the power of their clan, so the his defeat would be a good lesson for him.
Cafla Belial (カルファ・ベリアル, Karufa Beriaru) is Diehauser's mother and Lord Belial's wife. Calfa Belial loves her son dearly and like her husband, she made many sacrifices for Diehauser by selling valuable jewelry for Diehauser's education. She is also extremely protective of her son as she was initially against Diehauser's participation in the Rating Games out of fear that Diehauser may get hurt.
Naud Gamigin (ナウド・ガミジン Naudo Gamijin) is a member of the House of Gamigin from the 72 Pillars. An announcer of the Underworld media, he was one of the announcers during the Rating Game between Sairaorg and Rias.
Gragg Forneus (グラッグ・フォルネウス Guraggu Foruneusu) is a pure-blooded High-Class Devil of the House of Forneus. His facial features resemble that of an anglerfish. He appears to have a pirate obsession, being dressed as a pirate, wielding a cutlass sword, wears an eye patch (despite still having both eyes) owning a pirate ship he call the "Flying Dutchman" with his clan magic circle as a jolly roger and referring to himself as Captain Gragg. He comes off as a sexist pervert, constantly calling Rias a "bitch" and commenting on her large breasts. He actively pursued Lilitifa Vepar to recruit her as a member of his peerage, but when Rias stood in his way, Poseidon stepped in to settle the matter in a Rating Game with himself as the judge. When things were looking bad on his end, he left the battle and summoned a Kraken to ensnare Lilitifa and all of the ORC girls, Issei then donned his Scale Mail armor and blasted the Kraken with a Dragon Shot, defeating Gragg.
Eneely Vassago (エニーレィ・ヴァサーゴ Enīryi Vasāgo) is the elective head and next heiress of the House of Vassago. The House of Vassago originally had good ties with House of Astaroth until their downfall. Due to that, she has a grudge against Rias Gremory and her group. In spite of this, she willingly apologized to Rias after her fiancé caused trouble to her and everyone present.
Iolava Amon (イオラヴァ・アモン Iorava Amon) is the second son of the House of Amon, and the fiancé of Eneely Vassago. He looks down on Low-Class Devils, but is also perverted. He is also jealous of the kind of relationship Rias and Issei have, in where he's open about his perversion and Rias is accepting of it. He created a Cerberus named Bob that can use a long-range Dress Break after witnessing the beauty of Issei's Dress Break, seeing fully dress woman being naked in a blink of an eye as art. Issei was then wore his armor to force the Cerberus back into its cage. Eneely then scolds Iolava and apologizes to Issei and Rias.
Veves Furfur (ヴェヴェス・フールフール, Vu~evu~esu Fūrufūru) is the Bishop of Magdaran Bael's peerage from the House of Furfur. He is participating in the Azazel Cup under Team Imperial Purpure as Sairaorg's Bishop.
Unnamed Naberius Devil
He is the former King and Devil master of Kuroka. Belonging to the branch house of the Naberius clan, he was entrusted by the House of Nebiros to research information about how to artificially create Super Devils. Enlisting the aid of a human scientist, he continued to research the idea for strengthening as the scientist and his Nekomata wife, Fujimai were killed in a experiment gone wrong. Taking in their orphaned children, Kuroka and Shirone, he persuaded Kuroka to become his servant, making her his Bishop. As he continued to strengthen Kuroka, he intended to do the same towards her sister Shirone as he intended to force her to use her Senjutsu, which would have cause her powers to go out of control and harm her. Furious at the prospect of her sister being experimented on, Kuroka killed her master and fled the scene, becoming a Stray Devil as the younger sister Shirone was taken in to be questioned by the authorities.
Lucifer (ルシファー, Rushifā) was the King of Devils and one of the four original Satans, progenitor of the Lucifer Clan and master of the Lucifuge Clan. He was Lilith's husband and Rizevim's father, who is also known as the Morning Star. According to Mephisto, Lucifer like his fellow Satans had an extremely domineering personality. He also had immense arrogance as according to Azazel, Lucifer and the other original Satans tyrannically desired to become the Kings of the World by destroying the World to create their own definition of a new world of Devils. Lucifer, because of his ideology, had so much pride in his actions and this trait would be passed down to his son and descendants.
To realize their selfish shared ambition of world domination, Lucifer and his fellow Satans, the original Beelzebub, Asmodeus, and Leviathan, led the devils to fight in the Great War against the Angels led by the God of the Bible and the Fallen Angels led by Azazel, thus resulting in the deaths of billions of devils with more than half of the Devil Noble Clans of the 72 Pillars left extinct. A majority of the countless armies of devils that served under the 72 High-Class Devil Families also died in the process. Even after Lucifer's death in the Great War alongside his fellow Satans, his ideology still continues to cause a tremendous negative impact on the Devils from the Old Satan Faction, an organization of fanatic Devils who absolutely support his world domination ambitions, and who continued to cause danger and chaos to the Underworld.
Lilith (Mother of Devils)
Lilith (リリス, Ririsu) is the wife of Lucifer, the mother of Rizevim, the great grandmother of Vali Lucifer, and the ex-wife of Adam. She is known as the Mother of all Devils. She participated in the Great War against God and the Fallen Angels alongside the Original Satans. She went missing after the war and was not heard since then. Rizevim honored his mother by naming the spawn of Ophis, Lilith, after her. It's revealed that Lilith is still alive, having been hidden by Rizevim in his secret laboratory and being held at the Realm of the Dead by Hades.
It’s revealed that Hades found Lilith in Rizevim’s laboratory under the intel of Aži Dahāka and Apophis. Due to the immense strain from forcefully birthing Devils non-stop by her husband the original Lucifer, Lilith is on the verge of maternal death, trapped in a comatose state with her body rotting and decaying. Currently, Hades is using Lilith to create hundred thousands of devils, including the two Super Devils Balberith and Verrine. After the defeat of Alliance of Hell, Lilith was recovered by the higher-ups of the Underworld.
Razevan Lucifer (ラゼヴァン・ルシファー, Razevu~an Rushifā) was the grandson of the original Lucifer and Rizevim's son. Like Shalba Beelzebub, Katerea Leviathan, and Creuserey Asmodeus, Razevan had fanatically arrogant pride in his heritage as the Satan Lucifer's descendant. When he learned that Vali was born with a Longinus from his Human heritage, he developed a strong inferiority complex towards Vali as his son's ownership of a Longinus combined with the power of the Satan Lucifer he had inherited, would completely surpass his own power. This inferiority complex escalated into extreme terror, resulting in Razevan turning to Rizevim for advice out of desperation, who casually told him to bully Vali if he was that terrified of his son. Thus, Razevan began to constantly and viciously abuse Vali without any remorse or hint of guilt. He felt his dignity would be ruined by his own son and as a result, he would be utterly mocked for this.
Gradually, cruel abuse at one point was directed onto Vali's mother simply for showing Vali simple kindness, such as bandaging his wounds. Due to the immense pain, Vali suffered in his childhood, Vali held a strong hatred towards his father (and grandfather who was the one responsible for the abuse in the first place), to the point that Vali fully intended to commit patricide even if Rizevim did not kill his own son and when he learned of his father's demise, Vali felt great joy instead of sorrow.
Leviathan (レヴィアタン, Reviatan) was one of the four original Satans and progenitor of the Leviathan Clan, as well being the mother of Tsufaame Tereaku Leviathan. She also had immense arrogance as according to Azazel, Leviathan and the other original Satans tyrannically desired to become the Kings of the World by destroying the World to create their own definition of a new world of Devils
To realize their selfish shared ambition of world domination, Leviathan, and her fellow Satans, the original Beelzebub, Asmodeus, and Lucifer, led the devils to fight in the Great War against the Angels led by the God of the Bible and the Fallen Angels led by Azazel, thus resulting in the deaths of billions of devils with more than half of the Devil Noble Clans of the 72 Pillars left extinct. A majority of the countless armies of devils that served under the 72 High-Class Devil Families also died in the process. Even after Leviathan's death in the Great War alongside her fellow Satans, her ideology still continues to cause a tremendous negative impact on the Devils from the Old Satan Faction, an organization of fanatic Devils who absolutely support her world domination ambitions, and who continued to cause danger and chaos to the Underworld.
Tsufaame Tereaku Leviathan
Tsufaame Tereaku Leviathan (ツファーメ・テレアク・レヴィアタン, Tsufāme Tereaku Reviatan) is the daughter of the original Leviathan, who was preparing to assume the position of Satan Leviathan alongside the other Satan descendants and restart the Great War against the Angels and Fallen Angels. She was noted to be very powerful as her water attacks could defeat High-class Devils and even Ultimate-class devils as her attacks could wipe out an army of 10000 troops.
During the Devil Civil War, the Devil Army led by Tsufaame's Leviathan army and Anti-Government forces lead by Ajuka Astaroth fought against each other, the two fought each other in single combat at the old abandoned Gusion territory. They battled each other in the sky of Gusion castle town. She tried to drown Ajuka with enough water gathered to submerge the city, the water column rose towards Ajuka and tried to wrap around him or the water swelled as if it had a will of its own and created a myriad of sharp lances to attack Ajuka from all sides as various water monsters such as underwater-giant sea fish, sea snakes and titans appeared from underwater and attacked Ajuka. However, she was humiliated by being attacked by her own attacks which Ajuka redirected and being counterattacked by Ajuka himself, which caused her body to become damaged as she was losing breath. Angered, she transformed into her true Leviathan form; a thin and long giant floating serpent-shaped dragon as she opened her mouth wide and fired a giant dark blue aura several times but all of her attacks were all diverted Ajuka's Kankara Formula. She was asked to surrender by Ajuka, but choose her position, honor, and pride over her life as the Leviathan's army was wiped out and she was killed.
Beelzebub (ベルゼブブ, Beruzebubu) was one of the four original Satans and the progenitor of the Beelzebub Clan, as well as the father of Bidleid Bashalun Beelzebub. He also had immense arrogance as according to Azazel, Beelzebub and the other original Satans tyrannically desired to become the Kings of the World by destroying the World to create their own definition of a new world of Devils.
To realize their selfish shared ambition of world domination, Beelzebub and his fellow Satans, the original Leviathan, Asmodeus and Lucifer, led the devils to fight in the Great War against the Angels led by the God of the Bible and the Fallen Angels led by Azazel, thus resulting in the deaths of billions of devils with more than half of the Devil Noble Clans of the 72 Pillars left extinct. A majority of the countless armies of devils that served under the 72 High-Class Devil Families also died in the process. Even after Beelzebub's death in the Great War alongside his fellow Satans, his ideology still continues to cause a tremendous negative impact on the Devils from the Old Satan Faction, an organization of fanatic Devils who absolutely support his world domination ambitions, and who continued to cause danger and chaos to the Underworld.
Bidleid Bashalun Beelzebub
Bidleid Bashalun Beelzebub (ビドレイド・バシャルン・ベルゼブブ, Bidoreido Basharun Beruzebubu) is the son of the original Beelzebub, who was preparing to assume the position of Satan Beelzebub alongside the other Satan descendants and restart the Great War against the Angels and Fallen Angels. He and Rizevim Livan Lucifer have known each other since childhood. Due to Rizevim Livan Lucifer's insistence to not take control of the government and military, Bidleid lead things in his absence as the unofficial leader of the Satans.
In the middle of the Devil Civil War between the Satan Faction and Anti-Satan Faction, he visits the castle of the Satan Lucifer and exchanges his last conversation with Rizevim. He knew at this time that the Satans army would lose to the Sirzech and the rebels, but he did not stop fighting. He asked Rizevim if he was leaving Lucifaad and why he didn't fight as he could defeat the Rebel army, the Angels, Fallen Angels, and even the Gods of the other mythologies. He told Rizevim that in the near future, even if Rizevim became serious, he would be killed by the "Sacred Gear System" or those that surpass the Satans like Sirzechs and Ajuka. Beelzebub's army around Lucifaad and the rest of the Six Houses of Lucifer were also defeated without any resistance by the aces (Sirzechs, Ajuka, and Serafall) of the Rebel army. Eventually, the rebels invaded the residence of the Satan Beelzebub, where Bidleid lived and the last battle of the civil war began. Bidleid spread his twelve wings in the sky of the residence and fired a strong aura, however his attacks could not get through at all by the aura of destruction that Sirzechs released after he turned into an incarnation of destruction. Bidleid had lost one arm and one leg, half of his wings, and was bleeding heavily. His defeat was assured. Sirzechs gave him one last chance to change his mind, but he did not change his intention to defeat the angel Michael and the fallen angel Azazel, so he received the last sphere of destruction from Sirzechs and finally said; "The blood and wrath of the Satans will always be against you." With Bidleid's death, the civil war was effectively over.
Asmodeus (アスモデウス, Asumodeusu) was one of the four original Satans and the progenitor of the Asmodeus Clan, as well as the father of Damaidosu Zereikel Asmodeus. He also had immense arrogance as according to Azazel, Asmodeus and the other original Satans tyrannically desired to become the Kings of the World by destroying the World to create their own definition of a new world of Devils.
To realize their selfish shared ambition of world domination, Asmodeus and his fellow Satans, the original Leviathan, Beelzebub and Lucifer, led the devils to fight in the Great War against the Angels led by the God of the Bible and the Fallen Angels led by Azazel, thus resulting in the deaths of billions of devils with more than half of the Devil Noble Clans of the 72 Pillars left extinct. A majority of the countless armies of devils that served under the 72 High-Class Devil Families also died in the process. Even after Asmodeus's death in the Great War alongside his fellow Satans, his ideology still continues to cause a tremendous negative impact on the Devils from the Old Satan Faction, an organization of fanatic Devils who absolutely support his world domination ambitions, and who continued to cause danger and chaos to the Underworld.
Damaidosu Zereikel Asmodeus
Damaidosu Zereikel Asmodeus (ダマイドス・ゼレイケル・アスモデウス, Damaidosu Zereikeru Asumodeusu) is the son of the original Asmodeus, who was preparing to assume the position of Satan Asmodeus alongside the other Satan descendants and restart the Great War against the Angels and Fallen Angels.
In the civil war between the Satan army and the Rebel army, Damaidosu leads the Asmodeus army to face the Rebel army where Serafall served as an ace on the defunct territory of the Valefor family, and he along with his army almost became cornered by the overwhelming ice magic of Serafall. The Satan army regained the momentum when the forces of the Six Houses of Lucifer, where Grayfia served as an ace decided to join the fight and the royal army regained its strength. When Damaidosu saw the fierce magical battle between Serafall and Grayfia, he was dazed and awestruck as he couldn't intervene at all. About 10 days after the battle continued undecided, Sirzechs' army appeared and Satan's army re-grouped. The battle between the Rebel army, lead by Sirzechs and Serafall, and the Satan army, lead by Damidos along with the Six Houses of Lucifer continued for days, as land, nature, and landscape of the former Valefor domain suffered serious damage. The battle that was taking place in the old Valefor domain became confusing by the sudden appearance of a Fly Chimera, and both sides temporarily retreated their troops. After the Fly Chimera was defeated by Sirzechs, the battle at the former Valefor domain was resumed and Damaidosu was defeated and killed by Sirzechs and Serafall.
Lord Lucifuge (ルキフグス卿, Rukifugusu Kyō) was the father of Grayfia and Euclid, well as the leader of the Lucifuge clan. A silver-haired man with a fearless face. He admired the first Lucifer, and was the closest to Lucifer which forced him make multifaceted decisions.
Because Lucifer's son, Rizevim, was not interested in the future of the Underworld, the pressure exerted on Lucifer's right hand, Lucifuge, was great and he often acted on behalf of Lucifer.
During the Devil Civil War between the Satan Faction and Anti-Satan Faction, near the Valefor domain, the former of Satan Army sent him and the base of Lucifuge troops to front line, to support the Asmodeus army led by Damaidosu, with him acting as the military commander. He was poisoned during the sudden appearance of the Fly Chimera and was forced lie down in a bed at the medical camp for officers. When Sirzechs asked him to retreat his troops, he trusted Sirzechs and retreated.
When Damaidosu was defeated and killed, the Lucifuge army, which was supporting the Asmodeus army immediately surrendered. After the surrender, he called Sirzechs to the base of the Lucifuge Army. He did not recover from the poison and called for only Grayfia and Sirzechs at the bedside, hoping for the last visit. With a fading voice, he made two requests to Sirzechs. His first request was to destroy the House of Lucifuge as Euclid will become a threat to the Underworld, stating the House of Lucifuge would be better off destroyed than to be used to bring chaos to the Underworld. His second request was to take care of Grayfia as he knew she was in love with Sirzechs and becoming relieved when Sirzechs agreed, closing his eyes quietly with a satisfied face. In the end, he died, wishing for Grayfia's own happiness, while stroking his daughter's crying face with his hand saying "Lucifuge should always be with Lucifer.", but she should think about her own happiness from then own.
Zaorama Nebiros (ザオロマ・ネビロス, Zaoroma Nebirosu) was the head of the Nebiros Clan and the leader of the "Nebiros Institute". By nature, he was a devil who was only interested in his own research. During the Devil Civil War, he awakened Barbariccia; the deputy commander of the "Malebranche". At the end of the Devil Civil War, he escaped from Lucifaad and set up a laboratory deep underground in an undeveloped land where no High-Class Devils had territory. After skillfully crafting and destroying top-secret materials and artifacts from Lucifaad's research facility, he arrived there alone. Since then, his whereabouts remain unknown, even to the present day.
Bahamut (バハムート Bahamūto) is a reincarnated Devil serving as a Rook for Sirzechs Lucifer. He is a sacred beast known as the Glowing Fish of the Deep Sea (深海の光魚 Shinkai no Kōgyo). It is mainly used for transportation, searching the enemy and also to annihilate grunts.
Shooting Star's Rook
He is a Low-class Devil, who has a giant body with their height around three meters. Although he is a Low-class Devil, his power is stated to be that of an Ultimate-class Devil, as he possesses immense physical strength. Due to the fact that he couldn’t go to school because of his Low-class Devil status, he could only get a job taking care of boulders in wastelands. He was recruited by Shooting Star for his team; Team Shooting Star, as his Rook during the Azazel Cup. During their team's match against Sairaorg Bael's Team Imperial Purpure, he lifted a part of a mountain on the island and threw it at Sairaorg's Rook. However, due to the fatigue and injuries from the previous matches, he was losing his stamina as he was pushed back by Sairaorg's team, with his team losing the match due to Shooting Star being retired by Sairaorg.
Zatouji (ザトゥージ Zatōji) is a young Devil-in-training from Madara Town who specializes in familiars. He strives to become a Familiar Master. He acts as a guide to novice Devils who have yet to obtain a familiar. He suggests capturing several of the same types to breed them in order to gain more powerful familiars. In the anime, he is depicted as a middle-aged man. In the English dub of the anime, he speaks only in rhyme.
The Devil wife of the Fallen Angel Shemhazai, who he married some time before the series and became pregnant with his child. She was first mentioned at the end of Volume 4 in a conversation between Azazel and her husband. Not much is know about her except that she's noted to being a good woman for staying with Shemhazai at the risk of her assassination due to a few of Azazel's subordinates being against the peace treaty. Azazel also mentioned that their child will be the bridge between Devils and Fallen Angels.
Spider Stray Devil
An unnamed female Stray Devil that only appeared in the first episode of season 2. She initially had the appearance of a normal human with shoulder length blonde hair and red eyes, however she's able to shift into a creature with a spider-like body (albeit with six limbs), she has sharp teeth within her now big mouth, large eyes, pointy ears, a huge horn form her forehead and 6 spider legs sticking out vertically from the sides around her head. She comes across as vicious and feral minded, attacking any one on sight. In this form, she is capable of wall crawling and spewing webbing from her opisthosoma as well as acid that while gives a light burn the skin upon contact, it mostly burns away inorganic matter like clothes. She was hiding out in an abandoned warehouse until the Occult Research Club came to eliminate her. She was ultimately killed by Rias' Power of Destruction.
Voiced by: Itaru Yamamoto
The Gentleman Alchemist (錬金術師の紳士 Renkinjutsu-shi no Shinshi) is an unnamed Stray Devil who appears in the OVA episode "I'm Harvesting Breasts!". He is a scientist who experiments with living things. The alchemist has a huge obsession with large breasts to the point of hating small ones, viewing them as cruel and unjust. He stated that the world be a peaceful place if all the women in it grew to have huge breasts, believing the kindness in their hearts and the dreams of men would swell. He was captured by the Occult Research Club and interrogated by Grayfia, who revealed to the Occult Research Club that he created the Breast Chimera so that every flat-chested girl in the world would have larger breasts.
The Breast Chimera is a creation of the Gentleman Alchemist that appears in the OVA episode "I'm Harvesting Breasts!" It is a plant with Dragon-like features, and has the ability to produce breast-like fruits by feeding off of the spiritual energy from women's breasts, specifically the much bigger ones like Rias' and Akeno's. It does this by luring girls at night in their sleep, after which they return home with no clue of what happen, the girls later come down with an anemia-like illness. According to Grayfia, the Gentleman Alchemist created the Breast Chimera so that every flat-chested girl in the world would have large breasts by eating its fruit. It was defeated by Rias' boosted Power of Destruction.