All spoilers regarding the first four story arcs (volumes 1-20) are unmarked. Examples pertaining to the fifth story arc and Shin High School D×D can be spoiler tagged if necessary.
The mythologies in High School DXD are vast, with characters of various species roam the human world and the Underworld. This page details those characters.
Voiced by: Shinpachi Tsuji (Japanese) and R. Bruce Elliott (English)
The Norse god and leader of Valhalla. He's also a pervert.
- Authority Equals Asskicking: His first battle is against an armada of devils who are allied with the old Maou faction. He just casually summons his spear and wipes 'em all out.
- Badass in Charge: With all the power he has, it's little surprise that Rossweisse thinks she's Bodyguarding a Badass.
- Big Damn Heroes: In Volume 6, he arrives to help the Occult Research Club when they find themselves heavily outnumbered by an army of the Khaos Brigade led by Diodora. What does he do as his entrance? Flip Akeno's skirt.
- Broken Pedestal: He becomes one to Rossweisse at the end of Volume 7. She is introduced as his bodyguard, often taking care of him on trips and supporting his life. She often tries to get Odin off of his perverted antics. Unfortunately for Rossweisse, Odin abandons her after the battle with Loki. Since then, the mere sight of Odin will immediately set her off.
- Cool Old Guy: He's quite laid back as far as gods go, actively preserving the current peace order and complimenting Issei for his various feats.
- Did We Just Have Tea with Cthulhu?: Hung out at Issei's place and drinking tea because he's attending the peace talks in Japan.
- Dirty Old Man: He's often chastised for this by Rossweisse, which leads to him calling her a prude who'll never have a boyfriend. He's the one who gave Vali and Albion the title "Butt Dragon Emperor" after Vali half-heartedly replies to Odin's query about his fetishes that he thinks women's hips look nice.
- Heroic Sacrifice: He seals himself to suppress Trihexa.
- High-Class Glass: Wears a monocle on his left eye, representing the legend of the "one-eyed Odin".
- Jerk with a Heart of Gold: Despite his Dirty Old Man tendencies and arrogance, he does feel some responsibility for Loki's villainy, and acknowledged Issei and Vali's abilities.
- Named Weapons: Gungnir. This is Odin we're talking about here.
- Wizard Beard: A really long beard that goes down to his knees.
- See her entry on Issei's Peerage page.
The Evil God of Norse mythoogy, Loki plans to murder Odin and start Ragnarok. However, thanks to the intervention of Issei and his friends, his plans are quickly thwarted and he's captured.
- Abusive Parent: He treats his children as nothing more than tools to help him and his goals.
- Badass Boast: "Even if I don't use Fenrir, two fallen angels are no match for me!"
- Badass Longrobe: Wears a longrobe to signify his prowess as a capable fighter.
- Bad Boss: Loki doesn't particularly care much for the wellbeing of the Underworld Lifeforms, calling them expendable.
- Big Bad: The main antagonist of Volume 7/BorN and the EX spin-off.
- The Bus Came Back: He was completely absent after the end of volume 7 until EX, where it is revealed that Loki broke out of prison to wreak havoc on the timeline, which leads to the events of BorN. Unfortunately, it backfires thanks to the intervention of Issei's children.
- Continuity Rebooter: Even though he attempts to be a Continuity Rebooter, Loki's actually an "Alternate Timeline Maker". In EX, Loki inflicts a curse on Asia, then travels back in time with the Underworld Lifeforms and starts altering history, creating multiple parallel worlds, one of which is the BorN timeline. It's a Near-Villain Victory for him when Issei's kids travel back in time to capture him so that they can learn how to lift Asia's curse, derailing his plans.
- The Corrupter: In EX, his future self places a curse on Asia and travels back in time to rewrite history, which allows his present self to inflict a curse on Rias and Issei in BorN. It also ends up being his future self's undoing.
- Didn't See That Coming: In EX, he and the Underworld Lifeforms travel back in time to rewrite history and create an outcome favorable to the Evil Gods. However, he isn't prepared for Issei's children traveling back in time in order to lift a curse he placed on Asia, which effectively ends his plans.
- Dirty Coward: Happens in last three anime-original episodes of BorN. While imprisoned, he taunts Odin about the curse placed on Issei and Rias, and when called out on the fact that he did so (because he couldn't beat Sirzechs or Odin directly) he seals himself so nobody can force him to undo it. Unfortunately for him, Issei and Rias lift the curse in the Dimensional World.
- Fate Worse than Death: He ends up sealed with Rossweisse's spells at the conclusion of Volume 7.
- Generic Doomsday Villain: In the original Norse myths, he wants to cause Ragnarok to take over Asgard after wiping out the Aesir. Here, he doesn't appear to have any reason for wanting Ragnarok other than destruction for destruction's sake. The novels in particular only have him offhandedly mention Ragnarok once, complaining that Odin's intent on allying with other mythologies will get in the way. Lampshaded by Issei, who can't imagine what motivation he could possibly have for wanting to end the world. Vali suggests that there are simply people (like himself) who can't stand peace.
- A God Am I: Loki highlights exactly how dangerous a god complex is when someone has powers befitting a Physical God.
- Kick the Dog: In BorN, he inflicts a curse on the Gremory house and forces Rias to fight Issei in the season finale.
- Make Wrong What Once Went Right: He travels back in time with the Underworld Lifeforms in order to change history and create an outcome favorable for the Evil Gods. He succeeds in creating several parallel timelines, including the anime's Alternate Continuity depicted in BorN. EX makes it clear that Issei's children will have to travel back in time to lift a curse he inflicted on Asia, capturing him and preventing him from completing his scheme in the process.
- Motive Rant: When he's on the receiving end of a well-justified beatdown in EX, he spends his every waking moment ranting and raving about how he's the "one true Norse God," and how it's unfair that he's the one Norse who got imprisoned while all the other Norse were rightly forming alliances with other mythologies. Of course, he completely overlooks his own alliances with the Khaos Brigade, and then with the UL.
- Near-Villain Victory: In EX, Loki curses Asia and then travels back in time with the Underworld Lifeforms to change history, creating the timeline BorN takes place in, among others. He would have had the last laugh if not for Issei's children traveling back in time in order to lift Asia's curse, capturing him and negating his victory.
- One-Man Army: Consider this: on one side of the field, you have two Heavenly Dragon users who're fighting side by side, a team of fallen angels, the rest of the Occult Research Club, and the rest of Vali's group. On the other hand, there's him and Fenrir with Fenrir's sons and some mini-dragons. He still had the upper hand. It took divine intervention just to even defeat him.
- Shout-Out: His Artificial Longinus in EX takes the form of a staff in a similar vein to the Tesseract.
- Smug Super: Loves to proclaim his superiority due to his godhood to everyone, even his superiors, like Odin. It ends up being his undoing.
- Suicidal Cosmic Temper Tantrum: This is his ultimate goal. He is desperate to bring about Ragnarok and kill all of the mythologies, including himself. This is true to the original mythology, but the original Ragnarok was merely a means to an end. (Take over Asgard when everyone else is dead.) Here, he wants to kill everybody. Apparently, being in contact with other mythologies and being held in the Asgardian prison for thirty years changes his mind.
- Underestimating Badassery: He underestimates Issei and his allies during his battle with them in Volume 7 before he's easily defeated.
- Villain Override: He does one to Rias since he corrupts Issei and Rias with his curse in BorN. But it doesn't last long and they destroy the curse.
One of the older generation valkyries and Rossweisse's grandmother. She first appears in Volume 17 to check her granddaughter's condition and becoming a guest teacher at the Auros Academy.
- Chekhov's Gun: Having similar interest as her granddaughter means that she is also one who had a research on the topic of Trihexa. As a result, she was kidnapped by Qlippoth during the Auros Academy assault.
- Never Mess with Granny: Fights her way against the stray magicians during the Auros assault. Even with her powers sealed, Göndul could still try to put up a fight when Rossweisse gets taken by Euclid.
- Shipper on Deck: After seeing what Issei can do to protect her granddaughter, she consents Rossweisse's relationship and leaves her to his care.
- Shout-Out: Göndul is one of the valkyries mentioned in Prose Edda. It seems that in this series, the Eddic valkyries are the original/older ones, while the Wagnerian ones are of newer generation (becomes a case of Fridge Brilliance and Shown Their Work if you're into the works of Norse Mythology).
- Silver Vixen: Issei notes that while she is Rossweisse's grandma, her body is still fit as if she is younger. She is a Valkyrie after all.
- Valkyries: She is a famous magic master amongst Norse mythology.
Son of Odin. One of the Top 10 Strongest Beings in the World.
Son of Odin.
- Arranged Marriage: He is in an arranged marriage to Rossweisse, courtesy of her family. However, he has no interest in her and willingly relinquishes her to Issei in the aftermath of their duel.
- Extremity Extremist: His fighting style revolves around kicks combined with his Nice Shoes he is comparable to Thor.
- Gold and White Are Divine: A God who wears a white suit, has white-golden hair and golden eyes.
- Kung-Fu Wizard: He is also a powerful Magician who can attack, support his allies, weaken his opponents or strengthen his own body with magic while he also is a powerful physical fighter.
- Nice Shoes: He has a pair of Mystical Boots he got from Odin to fight against Fenrir.
- Powered Armor: Has his own artificial Balance Breaker armor called Ragnarök Earth Berserk using his pact with Midgardsormr as the source for it similar to Azazel's pact with Fafnir while the armor is full body it has most of a focus towards the legs because of Vidar's fighting style.
- Red Baron: God of Vengeance and Fenrir Eater.
- Shipper on Deck: Ships Issei and Rossweisse using his own Arranged Marriage with her to force them to confront they own feelings for each other knowing that Rossweisse was taking it slow with Issei.
- You Are in Command Now: With the sealing of Odin and Thor, he is the current Chief God of Norse Mythology.
The Chief God of Greek mythology. He appears with his brothers in Volume 10 as a VIP spectator of the Gremory-Bael Rating Game.
The Greek God of the seas. He appeared in one short story as a judge of a Rating Game. His formal appearance is in Volume 10, along with his brothers.
Voiced by: Masuo Amada (Japanese) and Robert McCollum (English)
The main antagonist of the third arc of the series, Hades is the ruler of the Realm of the Dead. He's also manipulating the Khaos Brigade to start the war in the Underworld. One of the Top 10 Strongest Beings in the World.
- Be Careful What You Wish For: He demanded to see Sirzechs' true form. Sirzechs complied.
- Big Bad: He's the main antagonist of the third and fifth arcs. The Khaos Brigade were nothing more than pawns to him.
- Dem Bones: What he looks like from the description.
- Everybody Hates Hades: Surprisingly played with despite the series generally staying true to the mythologies. Hades is not an evil being, rather he operates on Blue-and-Orange Morality. True to his myth, he believes the dead should remain dead, so it annoys him when the other pantheons continually revive the dead or reincarnate them. He in turn considers reincarnated beings as "fakes" and the other pantheons an "annoyance" for interfering with the Greek Pantheon, even denouncing Zeus for agreeing to work with them. So while he is largely true to his myth in regards to mortals, he is portrayed more antagonistically due to the cast being comprised of the supernatural.
- Evil Wears Black: His standard attire is a black uniform worn by high priests.
- Expy: Ishibumi based Hades' design on Ainz Ooal Gown from Overlord.
- Fantastic Racism: Hades despises all Pantheons outside of the Greek Pantheon, believing them to be nothing more than an annoyance. He also hates the "bats and crows" (Devils and Fallen Angels) for taking up space in the Underworld.
- Final Boss: After Rizevim is killed and Trihexa is sealed, he becomes the main threat to the heroes.
- Glowing Eyelights of Undeath: His eye sockets will occasionally glow, usually when angered.
- The Man Behind the Man: The Khaos Brigade would never have attacked the Underworld if Hades didn't let them.
- Not-So-Well-Intentioned Extremist: He allegedly wants to protect the human world and isn't entirely wrong about the threats Longinus pose (they were the source of both the Demonic Beast Riot and the Evil Dragon War), but he's already been established as a bigot and is partly motivated by an aversion to peace.
- Pet the Dog: After team Black Satan of Darkness Dragon King loses in the Azazel Cup, Verrine apologizes for it he pats her head telling her it's fine and she did great. After the defeat of Erebus and Tartarus, Hades decides that he will fight next Verrine offers to join but Hades tells her he doesn't mind if she stays out of it but she insists on joining.
- Signature Laugh: "Fafafa".
- Voice of the Legion: He speaks with a creepy, demonic echo as if several voices are speaking at once.
A servant of Hades and is a ultimate class Grim Reaper.
- Deader Than Dead: Pluto is killed by Vali's Empirio Juggernaut Overdrive, specifically the technique: Compression Divider. Said technique continually divided Pluto to the point of nonexistence, effectively erasing any trace of him.
- Sinister Scythe: Comes with being a Grim Reaper.
- The Worf Effect: After fighting on par with Azazel equipped with his artificial Sacred Gear, he becomes quick fodder for Vali's Empirio Juggernaut Overdrive.
The Greek King of Monsters and one of the Top 10 Strongest Beings in the World, tied with the pre-Nerf Fenrir.
- Affably Evil: He greets Azazel casually. Seems like this series' version draws much from Hercules: The Legendary Journeys
- Badass Family: He fathered many monsters with Echidna. That includes the original versions of Cerberus, Hydra, and the Evil Dragon Ladon.
- Blood Knight: He really likes to fight to a point he asks if Issei could be his opponent during their Rating Game despite Issei being Vidar's fight and when Ddraig was summoned during the Rating Game Typhon only focused on him and became excited to face him.
- Breath Weapon: He can breath fire.
- Deal with the Devil: How Azazel made a one-time pact with him through his wife, Echidna.
- Evil Is Hammy: Subverted; in his appearance, he borders to Affably Evil, but he is still the Greek King of Monsters.
- Weather Manipulation: He can control the weather even better than Dulio.
Son of Zeus.
- The Power of the Sun: He is the Greek God of the sun.
- Reasonable Authority Figure: Warns Issei and Vali that Hades is up to something that very likely involve them during the Azazel Cup and also says that he will write up a formal report for all of the factions later.
- You Are in Command Now: With the sealing of Zeus, he is the current Chief God of the Greek Mythology.
A ultimate class Grim Reaper from the conservative faction and Father of Bennia.
A ultimate class Grim Reaper from the militant faction and is the strongest of all the ultimate class Grim Reapers.
- Blood Knight: Wants to fight against Issei because he is a Heavenly Dragon and is the Strongest Red Dragon Emperor.
- Me's a Crowd: Attacks using clones against Issei.
- No-Sell: Took no damage from Issei's Dragon Shots while he was in his Cardinal Crimson Promotion.
- Sinister Scythe: He has two scythes in case one gets deformed in combat.
- Super Speed: Issei notes he has insanely high speed.
- Well-Intentioned Extremist: He's actually against Hades' creation of new pure Devils and wants to keep the info on Super Devils away from him.
The Greek Goddess of the night who allies with Hades against Team DxD.
- Casting a Shadow: As the Goddess of night, she can manipulate darkness.
- Dark Is Evil: The Greek Goddess of night, and sides with the Big Bad Hades.
- Jerkass Has a Point: Issei mentally acknowledges that her concern over Longinus users isn't unfounded given the Underworld crisis caused by Annihilation Maker and much of Qlippoth's actions stemming from the Holy Grail (though it's also pretty hypocritical when she's brainwashed Ingvild to make use of her Longinus).
- No-Sell: Her "Godly Virgin Killer Clothes" can nullify the attacks of male virgins, though Issei eventually destroys them with his Pseudo DxD-enhanced Dress Break.
- Of Corsets Sexy: Issei appreciates the corset that emphasizes her large breasts.
Voiced by: Yo Taichi (Japanese) and Janelle Lutz (English)
The leader of the Youkai faction at Kyoto and is also Kunou's mother.
- Antiquated Linguistics: Like her daughter, she uses archaic Japanese, including the personal pronoun "warawa" for herself.
- Attack of the 50-Foot Whatever: In her giant Nine-Tailed Fox, she can lay waste to a large city or burn down a Bandersnatch.
- Authority Equals Asskicking: Gave Saji a run for his money at Kyoto and blasts away one of the Bandersnatch during the invasion of the Underworld in Volume 12.
- Boobs of Steel: She's the leader of the Yokai and has quite a gifted chest.
- Brainwashed and Crazy: Thanks to the Khaos Brigade, who are using her to try summoning Great Red.
- Curtains Match the Window: She has blonde hair with matching yellow eyes.
- Distressed Damsel: Causes a lot of problems at Kyoto thanks to Cao Cao and the Hero Faction kidnapping her.
- I Want Grandkids: The Kyoto - Heavenly Dragon Descendant Plan implies this and telling Kunou to get along with Rias so she could have Issei's children.
- Kitsune: Considered the highest class of Yokai, she she has fox ears and nine tails, and her true form is a kitsune over 10 meters tall.
- One-Winged Angel: She can transform into her true form, the Nine-Tailed Fox, when it's necessary.
- Playing with Fire: She can manipulate fire at will to burn down enemies.
- Shipper on Deck: Ships Issei and her daughter Kunou, asking him to wait until she grows up.
- Single Woman Seeks Good Man: In Shin Volume 3, she expresses her loneliness and wish to be with a gentleman, such as Issei, who while rich, isn't nobility, meaning that she refers to his heart.
- Stacy's Mom: Her attractive looks and large bosom definitely tickle Issei's fancy upon meeting her for the first time at Kyoto, but that wasn't dwelled on much further due to other circumstances. However, she is pictured as one of Issei's brides in Chichigami's vision in Shin Volume 2, and she openly tries to have sex with him in the sauna - in front of Kunou, no less - in Shin Volume 3.
- Strong Family Resemblance: She's basically an older Kunou with big breasts.
- Yamato Nadeshiko: Japanese fox spirit, Japenese priestess and more-than-enough iron will.
- Foil: To both of her daughters. Whereas Kuroka and Koneko are both infatuated with Issei, both are able to either use it to manipulate him or keep their desires under control to keep their independence. On the other hand, Fujimai was so smitten with the scientist who would become the former's father that she stood by him despite her love not really being reciprocated and being treated as a Lust Object instead. She was so far gone, that she abandoned her daughters, just to continue being with him until their deaths at an experiment gone wrong.
- Lust Object: The scientist she was infatuated with simply used her for sex and did not really care for her in any way.
- Posthumous Character: She was already dead before she was mentioned in story.
Tropes applying to all of them:
- Composite Character: Very much like the different denominations of Christianity (and the Judeo-Christian faction in general), Ishibumi seems to combine the two myths into one to minimise the hassle. Also a case of Shown Their Work, in that many of the Buddhist Gods (especially the Indian ones like Sakra Indra) are derived from the Hindu tradition.
- Power Levels: Word of God states that their power levels are higher than anyone else because according to him, they can outright cheat their stuff and that if he really had to as a last resort, he will make an arc for them.
King of the Devas of Hindu mythology who has defeated the Asuras. He knows a lot more about the things going on than anyone else. One of the Top 10 Strongest Beings in the World.
- Breaking Speech: Gives a lecture to Azazel about Issei being all heroic and everything when in the end, he's still a devil. Azazel reluctantly agrees.
- Greater-Scope Villain: Of the third arc. Turns out Cao Cao answers to him.
- I Need You Stronger: Why he invites Issei to the Ocean of Milk to feed him Amrita, extending the duration of his Psuedo DxD.
- Red Baron: The Emperor of Heaven.
- Shock and Awe: His weapon Vajra allows him to produce massive lightning bolts that Akeno admits put hers and her father's to shame.
- There Can Only Be One: He tells Azazel that if Issei becomes a threat to the world, then he will personally eliminate him for there's only one room for having the title of "Heaven".
- War for Fun and Profit: His true reason for siding with The Alliance. That and to find people for recruitment purposes to defeat Shiva.
Voiced by: Mugihito (Japanese) and Charles Campbell (English)
The original Son Wukong from the Journey to the West. He's on a mission ordered by Sakra to defeat the Khaos Brigade and he's also trying to catch Bikou.
- Badass Beard: He has a long beard made of fur.
- Barehanded Blade Block: Stopping True Longinus with one finger counts.
- Cool Shades: He wields a black visor in the anime.
- Fragile Speedster: He claims that Issei or Vali could easily reduce him to ashes if they managed to land a decent shot. Keyword being "if". Even then, his stopping the strongest weapons among a group of god-killing tools with a single finger implies that he was just being humble.
- Simple Staff: He wields one of these as weapon, and it can extend to whatever length he likes.
- Smoking Is Cool: He has a traditional smoking pipe and he's certainly cool enough to have it.
The God of Destruction of Hindu mythology, Sakra Indra is trying to build an army to defeat him. One of the Top 10 Strongest Beings in the World.
- Blood Knight: Accepts Azazel's request only because he wants to cause destruction.
- Nice Guy: Despite being the God of Destruction of Hindu mythology, he's a very laid-back guy.
- Voluntary Shapeshifting: Introduced in the story as a young teenager.
- World's Strongest Man: After Ophis got hit with the Nerf stick, he's currently the biggest cheese in the mythology.
An unknown fairy accidentally summoned by Issei when he wanted to use Bilingual on Akeno's breasts. She shows up because Issei who loves breasts has reached and accepted the good graces of the god.
- Chekhov's Gunman: While she doesn't show up after her Deus ex Machina, Rizevim uses her existence as proof of the possibility of alternate dimensions.
- Deus ex Machina: Literally shows out of nowhere, gives Issei a hand by overriding Mjolnir to unlock its Shock and Awe abilities, and had Issei get a power-up that is a one-time form only. This was apparently enough to defeat a god.
A God from another world that is completely unknown to other mythologies until Issei accidentally summoned its fairy.
Underworld Life Form, commonly referred to as UL. Came from an alternate dimension to attack and travel from 30 years in the future with Loki to change the past.
- Armor-Piercing Attack: Uses a laser attack that can bypass a magic barrier made from the Norse Mythology system known for having the most advanced magic system.
- Frickin' Laser Beams: The basic attack of this group.
- Glowing Mechanical Eyes: The mooks eyes glow red when attacking.
- Homing Lasers: The laser is described as a whip.
- Mecha-Mooks: Uses ones that are barely humanoid.
- Starfish Robots: The mooks are described to be barely humanoid with it head similar to "gray space aliens", five eyes looking like an insect's compound eyes and neither a nose or mouth.
- Macross Missile Massacre: Can unleash a bombard that can destroy any target, penetrate any barrier and destroy events in the past.
- Me's a Crowd: Stores a number of his humanoid form in his hull and can use them to attack.
- Not So Stoic: Begins to tremble at the sight of future Issei's dragon form.
- Sapient Ship: His true form.
- The Stoic: Keeps himself calm and collected even when he is fighting future Gasper.
- An Arm and a Leg: Loses his left arm fighting Zen.
- Macross Missile Massacre: Can launch enough missiles to level a whole mountain.
- Mechanical Monster: A robot dragon.
- This Is a Drill: Gains a drill arm to replace his left arm.
The Number of the Beast of the story, having been sealed long ago.
- Bishounen Line: Even when its main bodies are sealed, it can still manifest its consciousness as humanoid cores.
- The Dreaded: Though no one knows for sure, some do claim that it is powerful enough to match Great Red. When Lilith confronts him after Azazel tells her to take care of him, her first instinct is that she's scared of him. And she is the incarnation of somewhat over 1/4 of Ophis' powers. And when Shiva finally sees it, even he admits that he'd be unable to kill it.
- Final Boss: After Rizevim dies, it becomes the final threat the heroes have to face in the fourth story saga.
- Generic Doomsday Villain: Portrayed more as a nigh-unstoppable force of nature than a character.
- Healing Factor: Jabberwocky has nothing on this creature. Even its exposed cores can regenerate From a Single Cell. Even Ddraig's newest power, a flame that burns eternally is little more than a nuisance, to an exposed core as it regenerates faster than the flames can burn it.
- Meaningful Name: Trihexa, Tri meaning 3 and Hexa from hexagon a 6 sided shape. It's name literally mean "three sixes", or 666.
- Mix-and-Match Critter: As described in the bible, it's a mix of various animals both real and fictional. It can also separate into seven different bodies without any of the bodies losing any effective strength.
- Monster Progenitor: As if Trihexa wasn't dangerous enough on its own, it can spit up eggs full of "fake Sekiryuutei"
- Number of the Beast: And Rizevim wants him.
- Playing with Fire: On several occasions it breathes walls of flame and massive fireballs.
- Sealed Evil in a Duel: Currently sealed away from other mythologies. Rizevim's death leads to him escaping, but the faction leaders end up resealing him again, following him into an artificial dimension where they will be in constant battle for the next few millennia, the following volume after nothing else works.