1 - 20 of 220 Works in Alternate Universe - Brooklyn Nine-Nine (TV) Fusion
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Summary
In this episode of Toontown 99:
Poppy meets up with her rival on a cruise.
Brusha and Boxten tried to suck up to a landlord.
And Dyle's sister is being dramatic around him.
Series
- Part 2 of ToonTown 99
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Title of your Sex Tape by miryum
Fandoms: DCU, DCU (Comics), Batman - All Media Types, Red Hood and the Outlaws (Comics), Brooklyn Nine-Nine (TV)
31 May 2026
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And then there was one. Y/n L/n. Dick sighed heavily, preparing himself for the shenanigans she would surely have gotten herself into. Dick’s gaze swept to the desk opposite Jason’s but… Y/n was sitting in her seat, cataloguing evidence. Dick’s mouth fell open. It was a miracle!
Detective!Jason Todd x detective!Reader based on Jake and Amy's relationship
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Rosa Diaz has a daughter, and she makes it her life goal that her daughter won't have the same upbringing as her.
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- Part 6 of Rosa Diaz x Oc
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In this episode of ToonTown99:
Poppy and Brightney argue over a mattress
Boxten accidentally scratched Dyle's car
And Sprout tries to get Brusha to be nicer to a kid
Series
- Part 1 of ToonTown 99
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The chaotic life of detectives by Little_star_Kitten
Fandoms: Biohazard | Resident Evil (Gameverse)
01 May 2026
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Chris loves his job as captain of the Star Detective Department in Raccoon city. Even when his detectives were probably the most chaotic group of people he could think of.
Are they good at solving murders? Yes. Did some of them thought it was a good idea to fill a flashbang with glitter and let it explode in Chris office? Also yes.
Still Chris wouldn't change his team for anything even if he would really like to know what the deal of some of them is.BB99/Detective AU with no zombies and ex-Agent Leon S. Kennedy
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Cold case, warm hearts by avalance_blackhill_shipper_1
Fandoms: Marvel Cinematic Universe, Marvel (Comics), Brooklyn Nine-Nine (TV)
30 Apr 2026
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Lieutenant Maria Hill and Detective Natasha Romanoff love to get on each others nerves. Captain Nick Fury just wants them to get along for the sake of everyone in the 99th precinct. But behind the shenanigans and silliness, Fury and Hill are working on something big. Can Natasha figure out this new case and her conflicting feelings for the Lieutenant before it's too late ?
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The room is quiet.
The air is still.And the only sounds Regulus Black can hear are breathing, his own and the one of the man in front of him, James Potter.
Don’t blink. Don’t do it. Just stop thinking, and do not blink.
Shit. No, no. His mind is screaming, he can’t stop is.
*Blink
Fuck.
It’s over.
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Or:A Marauders X Brooklyn 99 fic.
Jegulus, Wolfstar, Pandalily, Dorelene, Rosekiller, Wiseflower and more.James, Regulus, Sirius, Lily, Marlene, Peter, Mary, Minerva and Frank all work at the 99:th precinct in Brooklyn, New York.
The others . . .? Wait and see.
EDIT! Info in author’s notes in the beginning of chapter one.
Fuck J.K. Rowling.
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Brooklyn Nine-Nine, but Jake’s dream makes it Hogwarts AU.
Featuring: Auror Jake, Headmaster Holt, Deputy Headmistress Santiago… and yes, Boyle is an elf -
not your fault that they hover by sevify
Fandoms: Percy Jackson and the Olympians & Related Fandoms - All Media Types
15 Dec 2025
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The five times Detective Percy Jackson lets jealousy get the better of him, and the one time it works in his favour.
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aka, the Brooklyn Nine-Nine AU no one asked for.
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Alice in Tokyo Police Department - How To Not Fall For Your Partner 101 (Mission Failed Succsessfully) by NobodysPoet
Fandoms: 今際の国のアリス | Imawa no Kuni no Alice | Alice in Borderland (TV), Brooklyn Nine-Nine (TV)
08 Nov 2025
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“Everyone! Listen up, put on your ties so you can solve crime because obviously you can’t do so without one. Someone inform Captain Aguni we got a code fabric.” Everyone is silent. Karube sighs. “He’s right behind me, isn’t he?”
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"I'm Nobu, Sir." Once he is gone, Arisu looks at Sasaki in disbelief. "Feel old about that later. First let me fix your tie. It's distracting me from work."
"You were eating ice cream."
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Tatta giggles. “I like you two.”
Chishiya lightly punches Niragi’s arm. “What the hell was that for, Passenger Peasant!”
“Yellow car game. I see a yellow car. I punch you. You see a yellow car, I also punch you.”
“Don’t think that’s how it works? And where the hell do you see a yellow car.”
“Miata,” Chishiya points to a car. “It’s your metaphorically yellow car.”Or: Aib detective AU comedy (Brooklyn 99 style) because Karube deserves to be the main character in something, Arisu deserves a gun, Usagi is badass as always, Tatta steals cars, Banda steals cases, Niragi discovers the wonders of bisexuality and Chishiya gets called "The Doctor" for his parallel parking skills. There's shenanigans and basically everyone.
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S.H.I.E.L.D. & Shield by TheWanderingQuill007
Fandoms: Avengers (Comics), The Avengers (Marvel Movies), Avengers Assemble (Cartoon), Brooklyn Nine-Nine (TV), crossover - Fandom, Avengers X B99
09 Aug 2025
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This series of one-shot fanfics is inspired by the one-shot of Avengers 99 by PenDragonInkus, “Do Spiders Like Die Hard?” and “What a Joki”. Check out their work if you haven’t already. These one-shots are NOT canon- compliant so they can be placed anywhere on the timeline based on convenience. The personalities of the characters are a mixture of their MCU selves as well their counterparts in Marvel’s Avengers Assemble.
Disclaimer: I do not own any of these characters.
Series
- Part 1 of S.H.I.E.L.D. & Shield
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Un disparo directo al corazón, todo forma parte del juego que llamamos amor. by Yuzunny
Fandoms: Squid Game (TV 2021)
03 Aug 2025
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En la bulliciosa Comisaría 001, los detectives Seong Gi-hun y Hwang In-ho son famosos por su rivalidad juguetona, sus constantes discusiones y una química innegable que sus divertidos compañeros —y su jefe entrometido el Capitán Oh Il-nam— nunca dejan pasar por alto.
Entre competencias llenas de bromas, protegerse mutuamente de los abusones de la oficina y enviarse notas en secreto, la línea entre rivalidad y afecto comienza a desdibujarse. Entre chismes, sabotajes amistosos y momentos inesperados de vulnerabilidad, su vínculo se fortalece, desencadenando eventos que nadie en la oficina olvidará.
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O bien, se está gestando un romance en la oficina entre los policías «rivales» Gi-hun e In-ho, ante la mirada de sus compañeros de trabajo, que sufren por la tensión sexual que se respira entre ellos. 👮🏻♂️❤👮🏻♂️
Basado en Brooklyn Nine-Nine, old men yaoi policias.[𝘼𝘾𝙏 𝙄𝙄: 𝙍𝙚𝙬𝙧𝙞𝙩𝙩𝙚𝙣 𝙞𝙣 𝙎𝙤𝙣𝙣𝙚𝙩𝙨 & 𝙎𝙬𝙤𝙧𝙙𝙨. - Semana 2 de Inhun - Día 2: Oficina AU - ]
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Shot through the heart, It’s all part of the game that we call love. by Yuzunny
Fandoms: Squid Game (TV 2021)
03 Aug 2025
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In the bustling Police Precinct 001, detectives Seong Gi-hun and Hwang In-ho are notorious for their playful rivalry, constant bickering, and undeniable chemistry—something their amused coworkers and matchmaking captain never fail to notice.
Between prank-filled competitions, protecting each other from office bullies, and exchanging secret notes, the line between rivalry and affection blurs. Amid precinct gossip, friendly sabotage, and unexpected moments of vulnerability, their bond grows stronger, leading to events that no one in the office will forget.
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Or, an office romance is boiling up between 'rivals' Gi-hun and In-ho in the eyes of their coworkers, suffering from their sexual tension. 👮🏻♂️❤👮🏻♂️
Based in Brooklyn Nine-Nine, old men yaoi cops in love.[𝘼𝘾𝙏 𝙄𝙄: 𝙍𝙚𝙬𝙧𝙞𝙩𝙩𝙚𝙣 𝙞𝙣 𝙎𝙤𝙣𝙣𝙚𝙩𝙨 & 𝙎𝙬𝙤𝙧𝙙𝙨. - Inhun week 2 - Day 2: Office AU - ]
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Метод критического пути by Elga, fandom MXTX and Multicultivation 2025 (MXTX_novels)
Fandoms: 魔道祖师 - 墨香铜臭 | Módào Zǔshī - Mòxiāng Tóngxiù
01 Aug 2025
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Вэй Усянь и Лань Ванцзи — два лучших детектива девяносто девятого участка полиции Гусу. Очень жаль, что они терпеть друг друга не могут — или так, по крайней мере, считает детектив Вэй. Фьюжн с сериалом «Бруклин 9-9».
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thy eternal summer shall not fade (so long as men can breathe, or eyes can see) by sonyswings
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
14 Jul 2025
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Midoriya looks up at him but he seems confused so Denki decides to elaborate, “I solve cases, in like,” he snaps his fingers, “a blink of an eye.”
“I’m sure,” Midoriya says, turning back to his own papers but he doesn’t sound convinced so Denki keeps pushing it.
“I’m serious! I have the most solved cases at this precinct, like, half the time and everyone knows I’m the captain’s favourite too!” he goes on but Midoriya just hums, not even looking up this time. Denki narrows his eyes. “I can prove it to you. Right now.”
or, midoriya joins the precinct kaminari works at and kaminari almost immediately starts a rivalry with him. shenanigans ensue
written for MHA Rarepair Week Day One: Detectives/Mystery
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a fic where maddy and rosa babysit mac for a night, and rosa starts to reconsider her past beliefs
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- Part 2 of Rosa Diaz x Oc
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“Regulus Black, you have made me the happiest man on earth. I spent one whole dollar on this ring. Will you go on the worst date ever with me? You have to say yes.” He added the last part quickly with a bright smile on his face.
“Yes.” Regulus huffed. James took his hand and slipped the ring onto Regulus’ ring finger. It was a perfect fit. He leaned in to kiss the ring but Regulus snatched his hand away.
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Marauders x B99, Jegulus is Peraltiago!Series
- Part 1 of Marauders x B99
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The Arrival of the New Captain by boggy_blazing_mood
Fandoms: Bridgerton (TV), Bridgerton Series - Julia Quinn
14 Feb 2025
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The new captain Henry Granville is introduced to the team. We also see the counterparts for Goyle, Linetti, and Rosa Diaz.
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- Part 2 of Bridgerton Nine-Nine
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What are you doing weirdo?! by boggy_blazing_mood
Fandoms: Bridgerton (TV), Bridgerton Series - Julia Quinn
14 Feb 2025
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This was partly inspired by a rewatch of Brooklyn Nine-Nine and I realized that Jake and Amy's dynamic reminded me a lot of Theo and Eloise's.
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- Part 1 of Bridgerton Nine-Nine
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Precinct Nine-Nine, incident #405: The pie thief by Kestis_21
Fandoms: The Maze Runner Series - James Dashner, The Maze Runner (Movies)
28 Nov 2024
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Alby's walnut pie has been stolen and now he needs to find who in the precinct is the culprit before the end of thanksgiving.
*or another Brooklyn 99 inspired fic."
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- Part 27 of Newtmas to heal my soul