Good Crossovers
12 stories
Siren's Call (PJO/HP crossover) by ATOTALMUSICALNERD
ATOTALMUSICALNERD
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    Parts 15
Albus Dumbledore was surprised when he found a file on one Perseus Jackson Riddle, grandson of Voldemort. He was even more surprised when the boy was a powerful wizard at only thirteen years old. Harry and Percy enter their third year together, and although Percy has been introduced to the world of gods, he has yet to meet the Wizarding World. There will be cursing in this story.
Thalassophobia by CRYSTAL_M00N_ZM
CRYSTAL_M00N_ZM
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    Parts 18
The Avatar, the Last Airbender, the bridge between two worlds... That's Aang, a 112 year old boy who Katara accidentally found, frozen in a giant iceberg. When the ice had cracked open, a blazing beam of light had shot up into the sky like a mysterious signal. Her brother, Sokka, had been wary of it, but she had thought little of it. Maybe she should have paid a bit more attention to it though, because her Gran Gran informed them the next day that the "young man" that she had found wasn't the only odd person who showed up that day. Katara had many questions, but for now, she would stick to the one she had asked Aang just the day before. "What's your name?" "Percy. Percy Jackson."
ATLOP: Trial by Fire by WardofWinters
WardofWinters
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    Parts 39
Percy was having a normal day at the beach, until he decided to try to waterbend like Katara from his favorite show. Problem is, he succeeds. Now he has to figure out how to waterbend, and keep the normal people from finding out they have a waterbender in their midst. Finding out he's actually a child of Poseidon will probably explain a few things. Book One: Fire Used to be named Avatar: The Legend of Percy Updates twice a week
The Grandson Of Voldemort Is A What? by SerinaTheNerd
SerinaTheNerd
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    Parts 35
Percy has been through a lot, being kidnapped, having his memory wiped, several battles, two wars. He does not need anything else to happen. Too bad the wizards, which are real apparently (!?), didn't get the memo. Well, you know the phrase, when in Rome. (Heh, Rome, get it?) (After BoO and during Order of the Phoenix.) [I obviously am not Uncle Rick or JK Rowling.] {Anyone else got that Hufflepuff Pride?}
Phantom Files by LittleNightling
LittleNightling
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    Parts 18
After a tragedy, Danny decided to pursue psychology and become a therapist. After much consideration, he decides to take a job years after. What happens when he takes the internship at Arkham Asylum? What will become of the young Phantom when he meets all of the Gotham villains? Not only that, after their deaths, something changes with his powers Highest tags #1 on #dannyphantom 11/16/2020, 3/29/2022 #1 on #dannyfenton 2/16/2022 #2 on #danny 11/27/2020 #2 on #harleyquinn 12/13/2020 #4 on #batman 12/22/2020
The Ghost Of Wayne Manor by LoreneImp
LoreneImp
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    Parts 21
Bruce Wayne is missing, and Wayne Manor is empty. It's the perfect place for a tired young ghost to settle down and earn the qualifications for his haunting permit. Unfortunately, he didn't account for the groundskeeper, and now he has to spend ten years learning the ins and outs of haunting. All while coexisting with a kind old butler named Alfred Pennyworth. Characters belong to Detective Comics and Butch Hartman.
Jokers are wild. Ghost are Real?! by Blindbrail1
Blindbrail1
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    Parts 20
Batman and Robin find Harley breaking into an adoption agency. They find out she is looking for her son. The problem is the boy belongs to Joker too, to protect him from his biological father, Batman agrees to find the boy for Harley. Danny's in for wild ride.
The Truth That Lies Beneath by Cookie0929
Cookie0929
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    Parts 11
Nico Diangelo. A 16 year old boy who's seen to much. Somehow, he ends up in Gotham City,(much to his dismay) where he meets a man by the name of Bruce Wayne. He lets it slip that he has nowhere to go and Bruce decides to take him home and introduce him to the batfam. But there's more about him that this new family doesn't know. (This is after the Giant War) LANGUAGE!!! AND GORE!!! (Sorry I suck at descriptions)
Taken [Currently being re-written] by HK_imaginary
HK_imaginary
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    Parts 9
After finding happiness in Camp Half-blood, Nico di Angelo is once again ripped out of his old life. This Time, he finds himself in Gotham City, the most dangerous City in the US, without any advice or note by the Gods. In Gotham, he is taken in by billionaire playboy Bruce Wayne, who rarly has any time for him or his 4 other children, yet Nico still likes it there. But as he spends more and more Time in the Mansion, he starts to get suspicious. Why is no one in the Mannor in the Middle of the Night? How come Nico gets Nightmares about the City's hero's dying, although he didn't even meet any of them? The World's greatest defective on the other Hand also doesn't trust his new Ward. How come he doesn't know anything about the culture of the last few years? Why doesn't he talk about his past? Why does Nico have so may scars? ▪-▪-▪-▪-▪-▪-▪ I'm not that good at writing summaries, so just read the first few chapters and see for yourself. Also, this was originally planned as a young Justice FF, they will defnetly take a part in this. (After Season 2, the Mountan wasn't blown up, Nightwing returned after 7 Months) Bruce is 46 Barbara is 24 Dick is 22 Jason is 19 Cass is 17 Tim is 17 Nico is 16 Damian is 12 Started:08.12.19 Published: 02.04.20 Finished:
Agent Jackson: Avenger by oops-shenangians
oops-shenangians
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    Parts 14
This wasn't Percy's "Five Year Plan" originally, but now it's his life. *** Percy Jackson has been with S.H.I.E.L.D. for five years. He's been looking for Annabeth for five years. Now the director wants him on a mission. One Percy is all too familiar with: Saving the world. *** In the process of rewriting + updating this fanfic after four years of inactivity.