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Fanfic / A Devil's Diamond

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A Devil's Diamond is a High School DXD and JoJo's Bizarre Adventure crossover by MugiwaraN0Luffy. Here Josuke Higashikata, the protagonist of Diamond is Unbreakable, takes center stage as Issei Hyoudou's best friend and attends Kuoh Academy living a simple ordinary life... despite his best friend being a massive pervert. Things get truly bizarre when he gets dragged into an ancient war between Angels and Devils, and then Stand Users get involved since Josuke has a violent destiny in store to him thanks to his father's bloodline. So much for an ordinary life.

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The author also has the fic on Spacebattles, which can be found here.


This fic has examples of:

  • Adaptational Early Appearance:
    • Several Characters from Vento Aureo appear early on during the Excalibur Arc, with Bruno Bucciarati being Irina and Xenovia's group leader, and Passione members Ghiaccio and Carne being sent to aid Passione Allies amidst the Grigori.
    • Giorno Giovanna is mentioned to be allied with the Fallen Angels.
    • Jolyne from Stone Ocean shows up in chapter 18, in reference to the Little Jolyne goes to Morioh comic.
  • Adaptational Heroism:
    • Raynare, albeit Downplayed. She still commits the same actions as in Canon, and even joins Kokabiel after Josuke spared her the first time around. However, after Issei gets Josuke to spare her a second time, and Josuke saves her from a mortal wound dealt by Kokabiel, she has a legitimate change of heart and undergoes a Heel–Face Turn.
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    • Bruno, though downplayed. In canon, Bruno served as The Dragon to Polpo, having joined Passione to receive protection from the gang members who attempted to kill his father, and, with the aid of his own group and Giorno, intended to usurp Polpo and become a Capo, then identify the leader of Passione, usurp him, and use Passione to make Italy a better place. Here, he is a member of the Catholic Church, which was only vaguely alluded too by his soul ascending to Heaven at the series' end, but as a full fledged exorcist and The Mentor to Irina and Xenovia.
  • Adaptational Villainy:
    • Akira Otoishi, but Downplayed. In canon, he was a Big Bad Wannabe responsible for Keicho's death and tried to kill Joseph, but the most he ever did was steal and experiment on some rats with the Stand Arrow. Here, he's Myrcella Lucifuge's Queen, and an active enemy to both the Joestars and the Occult Research Club.
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    • Ghiacchio, although justified. In canon, Ghiacchio, along with the rest of the hitman squad, had defected from Passione two years prior after their comrades Sorbet and Gelato were killed and became Anti Villains. As the fic is set during the events of Diamond is Unbreakable, which takes place three years before Vento Aureo, Ghiacchio is still a member of Passione's hitman squad.
  • Adapted Out: Mugiwara has made it explicit that Koichi Hirose will not appear in A Devil's Diamond, both out of a personal disinterest of him, and as Issei already fulfills a similar role here.
  • Anti-Magic / No-Sell: Stands are basically immune to direct attack magic such as Riser's Fire or Akeno's Lightning, this is one of the reasons that stand users are terrifying to the Devil/Angel Community.
  • Bait-and-Switch: Wanting to be able to participate in the rating game in order to help his friends, Josuke offers himself to Rias to become part of her Peerage. Next chapter has her promptly turn him down, because he's making a rash decision out of heated emotions rather than completely of his own will.
  • Back from the Dead: Kakyoin, Avdol, Iggy, and Caesar Zeppelli are all revealed to have been reincarnated as angels.
  • Bash Brothers:
    • Josuke and Issei, being the main protagonists of the story, invoke this trope a few times.
      • Josuke helps save Issei from Elmenhilde while fighting Keicho. Issei then promptly returns the favor.
      • Josuke and Issei's combined attack against Riser Phenex in the Ratings Game.
    • Once Okuyasu shows up, he tends to share this dynamic with both Josuke and Kiba, often lending a hand during fights.
  • Battlecry: Given that this is a Crossover with Jojo in it, this is to be expected. Issei gets it on it too with his own in the battle with Riser. “OPPAPAPAPAPAPAPAPAPAPAPAPAPAPAPAPA”
  • Berserk Button: As always, Josuke will beat the shit out of anyone that makes fun of his hair.
  • Belligerent Sexual Tension: Between Okuyasu and Xenovia. After she insulted Asia, she ended up on Okuyasu's shit list, leading to the two of them fighting and ending in a draw. After initially engaging in Teeth-Clenched Teamwork for the sake of helping Kiba and finding the Excaliburs, the two slowly bonded while facing Notorious B.I.G.
  • Big Brother Instinct: Josuke towards Asia, so much so that realizing Issei is alone with her for the night sets it off and prompts him to call and threaten Issei into not doing anything, just after Asia asked if she could sleep in the same bed with him.
  • Celibate Hero: Josuke. Unlike Issei and Okuyasu, he turns down every single opportunity.
  • Clingy Jealous Girl: Downplayed. After Xenovia realizes her affections for Okuyasu, she reacts hostile and tense towards any girl he mentions, or girls he shows attraction to. But doesn’t Overreact or react in violence
  • Death by Adaptation: Thanks in part to their early appearances, Ghiaccio and Carne both die before they would in Vento Aureo. Ghiaccio is killed by Irina while she was defending Bruno, and Carne allowed himself to die against Xenovia so Notorious B.I.G. could attack her, only for Okuyasu to erase it with The Hand.
  • Decomposite Character: Due to Koichi being Adapted Out, the roles he would have had in the group dynamics are split amidst other characters.
    • Issei takes the role of Josuke's close friend, the two being Childhood Friends rather than newly introduced when the story begins like Koichi was.
    • Asia takes the role of Rohan's disciple, Rohan being Asia's contract.
    • Gasper takes the role of being both the softer counterpart to Jotaro, and Yukako's target of affections.
  • Everyone Has Standards: Jotaro Kujo, badass '90s Anti-Hero who has a penchant for calling his mom a bitch as well as being kind of a negligent father, is not amused by Issei's Dress Break. While he can see Issei is an okay guy, he threatens to kill Issei should he do something perverted around Jolyne.
  • Fangirl: Sona is a major fan of the Joestar family, nearly fainting after meeting Jotaro in person.
  • Female Gaze: During the pool chapter, the girls momentarily get distracted by Josuke and Okuyasu, who are both extremely well in-shape for their age.
  • Foreshadowing: The latest chapter has Asia and Rohan encountering a ghost named Reimi, who had been murdered by an unknown assailant. She also mentions how the towns' death rate is eight times higher than normal, and she has a scar on her back - the same mark as many other victims who met her fate. If you're familiar with Jojo, then you know who she is talking about.
  • Happily Married: Kakyoin married Gabriel some time between his reincarnation, and the present day.
  • Hero of Another Story: Quite literally for the Joestars. The forces of Heaven and Hell were aware of the events of Phantom Blood and Heaven was even tempted to intervene to stop Dio, but when Johnathan fought him, the Joestar Lineage became quite famous amongst the supernatural, with both the events of Battle Tendency and Stardust Crusaders being observed and sold as a book series, and garnering the Joestars numerous fans, among them Sona, and to a lesser extent, Rias. Upon discovering Josuke is a Joestar, they both desire to have him join their peerage.
  • Heterosexual Life-Partners: Issei and Josuke are best friends and always have each others backs.
  • Holy Burns Evil: Josuke uses Crazy Diamond to merge Asia's cross into Riser's chest near his heart, thus negating his healing/offensive powers and acting as a form of poison since even after Riser's physical injuries were healed he was still in a coma till Josuke took the cross out.
  • I'm Taking Her Home with Me!: Koneko has this reaction to Jolyne at one point.
  • In Spite of a Nail: Despite all the added characters to the fray, the Holy Swords Arc still ends with Xenovia exiled from the church with Irina none the wiser.
  • Jerk with a Heart of Gold: Elmenhilde may be haughty and arrogant, but she obviously cares for Okuyasu and is both shocked as well as disgusted by Keicho's apparent disregard for his younger brother. Red Hot Chili Pepper even notes that she doesn't want Okuyasu to get involved in the inevitable fight between the groups.
  • Lampshade Hanging: Embodied by Rohan Kishibe. Every person he reads he thoroughly analyzes and ultimately fits them into the role they'd have in canon.
  • Leaning on the Fourth Wall: When Rohan uses Heaven's Door to look inside Issei and read his personality, he admits the Issei would be an interesting Harem Protagonist, his perversion being a flaw that makes him more interesting than other Flat Character Leads.
  • Losing a Shoe in the Struggle: Happens to Xenovia during the fight with Notorious B.I.G. due to a piece of the stand latching onto her boot, forcing Okuyasu to remove, and erase it using The Hand.
  • Oh, Crap!: Jotaro has one when he realizes the lost boy staying with the Occult Research Club is Mannish Boy.
  • Odd Friendship: Issei and Josuke. Issei is a Lovable Sex Maniac who has earned the ire of basically the entire female student body. Josuke is a Nice Guy with tons of female admirers. While Issei won't shut up about the female body, Josuke prefers to keep quiet about his thoughts that concern attractive women.
  • Pet the Dog: Rohan had planned on taking a memory from Asia in order to use as material for his next work, but decided against it when he saw just how pure she was. At least until Issei showed up...
  • Pragmatic Villainy: When Jolyne arrives to Kuoh Town, Myrcella’s faction passes up on the chance to take her as a hostage. Not because it’s beneath them, but because it will incure Jotaro’s wrath and make him hunt more ferociously.
  • Rapid-Fire Fisticuffs: Being a Jojo cross this is pretty much to be expected but even Issei gets in on the action later on.
  • Reality Ensues:
    • Josuke allowing his emotions to take front seat in his decision making almost lead to him choosing to become a part of Rias' Peerage. While she had been wanting Josuke to join, she sees him as a friend and a friend would most definitely not allow for another friend to choose something that could majorly screw up their life because they were emotionally compromised.
    • With the adventures of the Joestar family being well known, the various factions would of course have their eyes on them. So it only makes sense that Kakyoin, Avdol, Iggy, and Caesar were recruited by Heaven after their deaths.
  • Retired Monster: Many of the assassins sent by DIO that survived the events of Stardust Crusaders retired and opted to live their lives, with the Speedwagon Foundation keeping tabs on them in case. Others however, such as Mannish Boy, are still up to their old ways, and Jotoro is contemplating hunting them down.
  • Sins of Our Fathers: Averted. Upon learning about Giorno Giovanna’s existance, Jotaro and Joseph make it clear that they don’t hold anything Dio did against him.
  • Spared by the Adaptation:
    • Raynare faces Josuke this time around, and he spares her and sends her back to her bosses. They tear her a new one though, causing her to seek revenge on Issei and Josuke. Unfortunately for her, Josuke was contemplating whether he should have let her go, or made her suffer the same fate as Angelo. When she does return and is beaten by Issei and Josuke again, Issei insists on sparing her still. After Josuke heals her from a mortal wound at the hands of Kokabiel, Raynare actually shows gratitude at being spared and pulls a Heel–Face Turn, leaving and going to find her own path in life.
    • Downplayed in that their fates were more ambiguous than fatal, but both Steely Dan and Rubber Soul were confirmed by the Speedwagon Foundation to be still alive.
  • Straight Man: Josuke often acts like this to Issei's perverted antics. Bruno does this as well for Irina and Xenovia.
  • Talk to the Fist: Jotaro is not impressed by Katarea, and uses the time stop to punch her mid-'big villain speech', as Azazel called it.
  • The Bus Came Back: Mannish Boy, last seen as a baby being delivered to the hospital during the Stardust Crusaders trip to Egypt, returns as a hired gun for Myrcella Lucifuge, now 12 years old and much stronger.
  • Time Stands Still: Jotaro still has this ability, and actually strengthens it, extending the length after stepping up his training, after finding out about Devils and Angels through Josuke. It's later revealed that even supernatural beings that should be able to resist it, such as the Satans and Archangels who can counter Gasper's version, fall prey to Jotaro's Time Stop.
  • The Dreaded: Even among the three factions, the ability to stop time is very rare. This was why Dio was considered a huge threat.
    • This also extends to Jotaro, since he has it as well and beat Dio, making enemies wary of angering him and drawing his attention. It's eventually revealed that a Stand's Anti-Magic combined with the Time Stop can affect even beings immune to Gasper's power, furthering their dread.
  • Title Drop: Sona asks Jotaro to sign her book for her, appropriately titled Jojo's Bizarre Adventures.
  • True Neutral: What Rohan fashions himself in the war between the house of Gremory and Myrcella Lucifuge. He has no interest in dying despite the potential for good writing material, nor does he aim to become a servant, leading him to stay out of the fight. He will however call for Asia and the others should Myrcella try to attack him.
  • Wham Line: One In-Universe. During the peace meeting a boy that Azazel has under his care of is brought up while explaining the actions of the fallen. Jotaro starts asking a few questions about him wanting to know if the boy is someone he is looking for. Then Jotaro reveals the connection that he has to the person in question and why he is looking into him. To say that the three faction leaders were surprised would be an understatement.
    Jotaro "That boy, Giorno Giovanna as you call him, is the son of Dio Brando."
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