History Main / SharedUniverse

* Warner Bros. created the Franchise/DCExtendedUniverse for all their DC Comics properties, beginning with the initial standalone film ''Film/ManOfSteel''. ''Film/BatmanVSupermanDawnOfJustice'' followed it up as a crossover with Batman and an introduction to the larger DC mythology, with ComicBook/WonderWoman included as part of the story. In contrast to other cinematic universes, which are heavily centralized and designed by committee, the DC Extended Universe is intending to allow the directors a lot of individual freedom [[note]]with the notable exceptions of ''Suicide Squad'' and ''Justice League'', which were subjected to much ExecutiveMeddling due to studio execs getting nervous at the reception of the first two films, which were directed by Creator/ZackSnyder[[/note]], so long as they stay within certain narrative boundaries.

** The Red Arremer clan from ''VideoGame/GhostsNGoblins'' has appeared in some of Capcom's earlier titles, establishing a small universe of sorts -- they appear in ''Higemaru Makaijima'' along with a whole island of enemies from the game (plus a Red Arremer is revealed as the FinalBoss), they also appear as enemies in ''VideoGame/BlackTiger'', and other creatures appear in ''The King of Dragons''.

** Phase 5: The current phase with its themes TBD, though it did launch with the full reveal of the MythArc BigBad in ''Film/AntManAndTheWaspQuantumania'' and will explore him further in a second season of ''Series/{{Loki|2021}}''. Other films and shows planned for this phase include ''Film/GuardiansOfTheGalaxyVol3'', ''Series/{{Secret Invasion|2023}}'', ''Film/{{The Marvels|2023}}'', Series/{{''Echo''}}, ''Ironheart'', ''Agatha All Along'', ''Daredevil: Born Again'', ''Film/DeadpoolAndWolverine'', ''Captain America: Brave New World'', and ''Thunderbolts''.

** Phase 5: The current phase with its themes TBD, though it did launch with the full reveal of the MythArc BigBad in ''Film/AntManAndTheWaspQuantumania'' and will explore him further in a second season of ''Series/{{Loki|2021}}''. Other films and shows planned for this phase include ''Film/GuardiansOfTheGalaxyVol3'', ''Series/{{Secret Invasion|2023}}'', ''Film/{{The Marvels|2023}}'', Series/{{''Echo''}}, ''Ironheart'', ''Agatha: Coven of Chaos'', ''Daredevil: Born Again'', ''Film/DeadpoolAndWolverine'', ''Captain America: Brave New World'', and ''Thunderbolts''.

** Phase 5: The current phase with its themes TBD, though it did launch with the full reveal of the MythArc BigBad in ''Film/AntManAndTheWaspQuantumania'' and will explore him further in a second season of ''Series/{{Loki|2021}}''. Other films and shows planned for this phase include ''Film/GuardiansOfTheGalaxyVol3'', ''Series/{{Secret Invasion|2023}}'', ''Film/{{The Marvels|2023}}'', Series/{{''Echo''}}, ''Ironheart'', ''Agatha: Coven of Chaos'', ''Daredevil: Born Again'', ''Deadpool 3'', ''Captain America: Brave New World'', and ''Thunderbolts''.

** Phase 5: The current phase with its themes TBD, though it did launch with the full reveal of the MythArc BigBad in ''Film/AntManAndTheWaspQuantumania'' and will explore him further in a second season of ''Series/{{Loki|2021}}''. Other films and shows planned for this phase include ''Film/GuardiansOfTheGalaxyVol3'', ''Series/{{Secret Invasion|2023}}'', ''Film/{{The Marvels|2023}}'', ''Echo'', ''Ironheart'', ''Agatha: Coven of Chaos'', ''Daredevil: Born Again'', ''Deadpool 3'', ''Captain America: Brave New World'', and ''Thunderbolts''.

* Warner Bros. intends to start a cinematic universe of Creator/HannaBarbera properties beginning with ''Franchise/ScoobyDoo'' adaptation ''WesternAnimation/{{Scoob}}'', with films based on ''WesternAnimation/TheJetsons'', ''WesternAnimation/TheFlintstones'' and ''WesternAnimation/WackyRaces'' also confirmed to be in development. As stated through prerelease material for ''WesternAnimation/{{Scoob}}'', other properties that are confirmed to exist in this universe include ''WesternAnimation/CaptainCavemanAndTheTeenAngels'' and ''WesternAnimation/DynomuttDogWonder''.

* Warner Bros created the Franchise/DCExtendedUniverse for all their DC Comics properties, beginning with the initial standalone film ''Film/ManOfSteel''. ''Film/BatmanVSupermanDawnOfJustice'' followed it up as a crossover with Batman and an introduction to the larger DC mythology, with ComicBook/WonderWoman included as part of the story. In contrast to other cinematic universes, which are heavily centralized and designed by committee, the DC Extended Universe is intending to allow the directors a lot of individual freedom [[note]]with the notable exceptions of ''Suicide Squad'' and ''Justice League'', which were subjected to much ExecutiveMeddling due to studio execs getting nervous at the reception of the first two films, which were directed by Creator/ZackSnyder[[/note]], so long as they stay within certain narrative boundaries.
** Warner Bros was actually [[WhatCouldHaveBeen supposed to launch]] their DC cinematic universe in 2011 with the release of ''Film/{{Green Lantern|2011}}'', but poor reception caused the movie to under-perform, and set the possibility of a shared universe back until their next attempt with 2013's ''Film/ManOfSteel'' which, despite its mixed reception, did better at the box office.

** Similar to Warner Bros, Fox also had a WhatCouldHaveBeen example with their ''ComicBook/FantasticFour'' [[Film/FantasticFour2015 reboot]]. It was originally going to be set in the same universe as their ''X-Men'' films, but the dismal reception to said movie ended up destroying any hope of going forward with a sequel, or possible crossover, with the new Fantastic Four cast.

* ''Manga/YuiKamioLetsLoose'' shares continuity with ''Manga/NuraRiseOfTheYokaiClan'' as [[spoiler:Ryuji Keikain]] appears at Yui's behest in Chapter 14 and [[spoilers:returns in the final chapter of the series]].

* Implied in ''Anime/IsekaiQuartet'', Aqua figures out that [[Literature/Overlord2012 Ainz]], [[Literature/ReZero Subaru]] and [[Literature/TheSagaOfTanyaTheEvil Tanya]] all hail from Japan just like [[Literature/KonoSuba Kazuma]], suggesting they all come from the same world.

** Virtually all of the early Creator/ImageComics titles were set in the same universe, with the stars of any given book often making guest appearances in another or ahving their origins tied to characters from other series. ComicBook/{{Spawn}}'s killer, for example, is Chapel from ''ComicBook/{{Youngblood}}''. However, one of the core ideas of the company was and always has been creator ownership. This caused a ContinuitySnarl no less than ''twice''; Once, when Creator/RobLiefeld picked up his characters and left to create Awesome Comics, necessitating that Spawn's killer be retconned to be Jessica Priest, and again when Jim Lee took ''his'' properties and made his Wildstorm Studios into a DC imprint, which required an entire crossover, ''Shattered Image'', to excise the Creator/WildStorm characters from continuity.

* In terms of ''Webcomic/MSPaintAdventures'' comics, ''Webcomic/{{Jailbreak}}'' and ''Webcomic/BardQuest'' take place in the Realm of Imagination of ''Webcomic/ProblemSleuth''. ''Webcomic/{{Homestuck}}'' is the only adventure to not make it entirely clear whether it takes place in the same world as the previous ones, though ''Problem Sleuth'' exists in-universe as a ShowWithinAShow that the human cast references plenty of times. [[spoiler:''Webcomic/Homestuck2'', on the other hand, brings some of the characters back through the use of a Fenestrated Wall.]]

* In the late 2010s, there were plans to create a shared universe of adult animated series based on characters from Creator/MarvelComics for Creator/{{Hulu}}. The planned shows were to be based around [[Characters/MarvelComicsAIM M.O.D.O.K.]], ComicBook/HowardTheDuck, ComicBook/{{Dazzler}} & [[Characters/TheAvengers Tigra]], and ComicBook/HitMonkey, with the four shows culminating in a crossover miniseries titled ''The Offenders''. However, as the shows were being developed, producer Creator/MarvelTelevision was absorbed into Creator/MarvelStudios, causing the plans to be scrapped. Ultimately, ''WesternAnimation/MODOK2021'' and ''WesternAnimation/HitMonkey'' were the only two shows to make it to air while the rest were canceled. While the shows did share a universe, with ''Hit-Monkey'' referencing events from ''M.O.D.O.K.'' in a news scroll, their differing animation styles and tones (''M.O.D.O.K.'' being a stop motion DomCom and ''Hit-Monkey'' being a more serious 2D action show) made a crossover unlikely. Compounding this issue is the fact that ''M.O.D.O.K.'' was canceled after one season while ''Hit-Monkey'' was renewed but moved production to Creator/TwentiethTelevisionAnimation with the Marvel branding being removed.

* Several episodes of ''WesternAnimation/LiloAndStitchTheSeries'' feature crossovers with ''WesternAnimation/AmericanDragonakeLong'', ''WesternAnimation/TheProudFamily'', ''WesternAnimation/{{Recess}}'', and ''WesternAnimation/KimPossible'', implying they all live in the same world.

* The story ''Fanfic/{{Avalon}}'' by [=Dave19941000=] is an ''Anime/NeonGenesisEvangelion''/''Franchise/MarvelCinematicUniverse'' crossover which shares its setting with the writer's ''Series/StargateSG1''/''Series/BattlestarGalactica2003'' crossover ''Brother's Betrayal'', and the ''Series/StargateSG1'' fanfic ''Stargate: Triangulum''.

* ''ComicBook/GilgameshTheImmortal'' is part of a shared universe with several other works written by Robin Wood, such as Nippur of Lagash (a comic about the adventures of a warrior in ancient Mesopotamia) Or-Grund (about the adventures of a barbarian hero in a world of SwordAndSorcery), Raycon (An astronaut who after a space journey that lasts centuries, returns to a post-apocalyptic planet Earth), among others, all have in common the presence of The Primordials, an alien race AlwaysChaoticEvil obsessed with destruction and conquest. Inconsistencies abound, but that's because this universe was accidental and unplanned from the beginning.

** Jay and Silent Bob are due to appear in the upcoming ''Moose Jaws'', which would put this and the other installments of the ''True North Trilogy'', ''Film/{{Tusk}}'' and ''Film/YogaHosers'' in the same universe.

*** The 45th anniversary series ''Series/KikaiSentaiZenkaiger'' depicts all the previous series as each being in a separate universe, even though this contradicts what was established in the ''Gokaiger''. This likely means that each Sentai show has its own universe, but ''Gokaiger'' and other crossovers take place in a universe with its own versions of most of the other teams. Or that ''Gokaiger'' is the "prime" universe with all the Sentai teams, and the worlds in ''Zenkaiger'' are alternate universes each with only one ''Sentai'' team. ''Series/AvataroSentaiDonbrothers'' is a sequel to ''Zenkaiger'' but how the two shows are connected is currently unclear because Kaito from ''Zenkaiger'' is a supporting character in ''Donbrothers'', but has an entirely different personality, although episode 26 implies that he remembers the events of ''Zenkaiger'', hinting that it is an alternate timeline. So now it seems that Super Sentai is retiring the shared universe and switching to a shared multiverse. It also no longer seems to share a universe with ''Kamen Rider'', as ''Film/KamenRiderSaberPlusKikaiSentaiZenkaigerSuperHeroSenki'' shows that ''Super Sentai'' and all the previous ''Kamen Rider'' seasons are works of fiction in the world of ''Series/KamenRiderSaber'' but interestingly, ''Series/KamenRiderRevice'' is a show in the world of ''Donbrothers''. The following series, ''Series/OhsamaSentaiKingOhger'', diverges even further by taking place in a world very different than ours which resembles a MedievalEuropeanFantasy. This also is supported by the film ''Film/NinpuuSentaiHurricaneger10YearsAfter'' which is a sequel to ''Hurricaneger'' but takes place in an alternate continuity that ignores all of the events that happened to the ''Hurricaneger'' characters in crossovers following the show, so it takes place in the ''Hurricaneger'' universe, but not the main universe.

* ''WesternAnimation/HandyManny'' and ''WesternAnimation/SpecialAgentOso'' have a crossover episode. *WesternAnimation/DocMcStuffins, and then Doc [=McStuffins=] later meeting WesternAnimation/WinnieThePooh and the other inhabitants of the Hundred Acre Wood.

* Over the years Capcom has created a hefty shared universe between several of their Arcade/retro franchises, all centered around ''Franchise/StreetFighter'':

** ''VideoGame/DinoCrisis'' has several crates featuring the [[Franchise/ResidentEvil Umbrella Corporation logo]]. Furthermore, [[LightGunGame light gun shooter]] GaidenGame ''Dino Stalker'' is actually the third installment of ''Resident Evil'''s spin-off series ''Gun Survivor'', featuring Umbrella {{Easter Egg}}s in the form of the "Woman Drawing Water" statue seen in [[VideoGame/ResidentEvil1 the Spencer Mansion's exhibition room]] and an abandoned Umbrella building.

** The Red Arremer clan from ''VideoGame/GhostsNGoblins'' has appeared in some of Capcom's earlier titles, establishing a small universe of sorts: they appear in ''Higemaru Makaijima'' along a whole island of enemies from the game (plus a Red Arremer is revealed as the FinalBoss), they also appear as enemies in ''VideoGame/BlackTiger'' and other creatures appear in ''The King of Dragons''.
** And the UrExample in terms of Capcom's cross-continuity: main character of ''VideoGame/{{Commando}}'' Super Joe appearing as a secondary character in ''VideoGame/BionicCommando'', establishing the two series were set in the same world, which was later followed-up a bit by the follow-ups and remakes. Capcom USA tried early to establish this connection by claiming the nameless protagonist of the Arcade ''Bionic Commando'' to be Super Joe in its flyer, and did this a second time to another Arcade game, the otherwise-unrelated gun-n-run ''The Speed Rumbler''. While the former was kinda canonized by the history recap in the ''Rearmed'' website, the latter was completely ignored. The 2009 ''Bionic Commando'' also has billboards sporting the logo of [[VideoGame/ResidentEvil5 TRICELL]] as well, tying it to the Resident Evil/Dino Crisis universe above.
* The ''VideoGame/DeadOrAlive'' and ''VideoGame/NinjaGaiden'' series both take place in the same universe (owing to being developed by Creator/{{Tecmo}}[=/=]Team Ninja), complete with having characters originating in one becoming plot-integral in the other. Most notably (see the entry in CanonWelding for more examples), Ryu first crossed over to ''DOA'' and canonically won the second tournament, followed by Ayane playing a supporting role in the second ''Ninja Gaiden'' trilogy, with Kasumi making brief cameo appearances in ''Sigma 2'' before becoming a playable character herself in ''3: Razor's Edge''. Of course, characters [[YouDontLookLikeYou will change looks]] [[ArtShift to match the art style of the respective games]]. Fellow Tecmo IP ''VideoGame/FatalFrame'' is also in this shared universe due to Ayane's side story in ''VideoGame/FatalFrameMaidenOfBlackWater'', and ''VideoGame/{{Nioh}}'' turned out to be a prequel to ''Ninja Gaiden'', as an ancestor of Ryu named Jin Hayabusa appears in the lategame mission.
* While Creator/{{Koei|Tecmo}}'s ''VideoGame/WarriorsOrochi'' was made to confirm that its series ''VideoGame/DynastyWarriors'' and ''VideoGame/SamuraiWarriors'' take place in the same universe, the second trailer of ''Warriors Orochi 3'' more or less confirms that Koei's other games (''VideoGame/WarriorsLegendsOfTroy'' and ''VideoGame/BladestormTheHundredYearsWar'') also are part of this setting due to the presence of Achilles and Jeanne D'Arc. It also confirms that its business partner Tecmo's series ''VideoGame/NinjaGaiden'' and ''VideoGame/DeadOrAlive'' (see directly above) take place there due to the presence of Ryu Hayabusa, Ayane, Momiji and later Kasumi. Naotora Ii would later cross over to ''DOA'', making an appearance in ''VideoGame/DeadOrAlive5 Last Round''.

** Origin seemed to be trying to establish this in all of their mid-90s games- in addition to the connections between ''Wing Commander'' and ''Ultima'', the manual for ''Wing Commander Arena'' has, among other things, an advertisement for a ''[[VideoGame/{{Crusader}} No Remorse]]'' movie.

** Additionally, Pookas often show up in ''VideoGame/PacMan'' titles, despite the Pac-Man universe not being anywhere in the UGSF timeline, although considering the number of elements that overlap in Namco games in general (the Special Flag from ''VideoGame/RallyX'' showing up in several other games for instance), this may just be more of a tribute rather than an actual connection.

* ''VideoGame/MegaManClassic'', ''[[VideoGame/MegaManX X]]'', ''[[VideoGame/MegaManZero Zero]]'', ''[[VideoGame/MegaManZX ZX]]'', and ''[[VideoGame/MegaManLegends Legends]]'', are all on the same timeline despite the tone reaching further and further away from the original series with each new series.
** ''VideoGame/MegaManBattleNetwork'' and ''[[VideoGame/MegaManStarForce Star Force]]'' both share a timeline [[AlternateContinuity separate]] from the original series. However, it is also implied that Lan Hikari's grandfather (Tadashi Hikari aka "Dr. Light") and Doctor Wily from those games are the same, just that in this universe [[ForWantOfANail internet and cyberspace-based technology took off instead of robotics technology]].

* ''VideoGame/Downfall2009'' and ''VideoGame/TheCatLady'' share a universe. The 2016 remake of ''Downfall'' make this even more obvious, having [[spoiler: The Cat Lady ''herself'', Susan Ashworth, show up at the end.]] This indicates that ''Downfall'' takes place sometime after the events in ''The Cat Lady''.

** Through CanonWelding, and Akuma's GuestFighter status, it's suggested that ''Franchise/{{Tekken}}'' and ''Franchise/StreetFighter'' are set in the same universe (or, at the very least, a version of ''Street Fighter'' exists in the ''Tekken'' universe). Unlike the following DLC characters [[VideoGame/FatalFury Geese Howard]], [[VideoGame/FinalFantasyXV Noctis]] and [[Series/TheWalkingDead2010 Negan]], Akuma is actually present in the game's story, has established plot ties to its BigBad, and faces both Heihachi and Kazuya in epic battles, the latter serving as the game's epilogue.
** The ''VideoGame/SoulSeries'' takes place in the distant past of the ''Franchise/{{Tekken}}'' series. The links between the two have been minimal (the most critical one being the presence of a man named [[LegacyCharacter "Yoshimitsu"]] leading a group of ninjas called the "Manji" in both, the one in ''Soulcalibur'' being the 16th century ancestor of the one who comes from ''Tekken'') but exist in the same reality. By extension, this would also mean that ''Franchise/TheWitcher'' is canon to ''Tekken'' and ''Street Fighter'', considering that Geralt's appearance in ''VideoGame/SoulcaliburVI'' is canon to that game's story.
** ''Tekken'' is canon to ''VideoGame/{{Xenosaga}}'', since Shion Uzuki can receive an email from Kazuya in ''Episode I'' showing him in ''Tekken 4'', which would make ''Xenosaga'' canon to ''Street Fighter'', ''Tekken'', ''Soulcalibur'', and ''The Witcher''. [[spoiler:Given that ''VideoGame/XenobladeChronicles3FutureRedeemed'' ended up ArcWelding ''Xenosaga'' and ''VideoGame/XenobladeChronicles'', it would also mean that the ''Xenoblade Chronicles'' games are canon to all the aforementioned franchises.]]

** ''KOF'' itself is an AlternateContinuity to the joint ''VideoGame/ArtOfFighting[=/=]VideoGame/FatalFury'' timeline [[SchrodingersCast by virtue of]] Geese Howard being KilledOffForReal in 1995's ''Real Bout Fatal Fury'' but sporadically appearing in ''KOF'' alive and well starting [[VideoGame/TheKingOfFighters96 the following year]]. There's also the decade or so gap between ''AOF'' and ''FF'', reflected by a younger Geese serving as the TrueFinalBoss of ''Art of Fighting 2'', an older Ryo Sakazaki appearing in the [=PlayStation=] port of ''Fatal Fury: Wild Ambition'' as [[LegacyCharacter Mr. Karate II]], and one of Ryo's students (Marco Rodriguez/[[DubNameChange Khushnood Butt]]) being included as part of the ''VideoGame/GarouMarkOfTheWolves'' roster. Classic SNK wrestling game ''3 Count Bout'' is also connected, as Big Bomberder is a tag partner of Raiden, is shown squaring off with Big Bear (Raiden's {{Face}} persona) in artwork for ''Fatal Fury Special'', and is mentioned in Raiden's [[AllThereInTheManual profile story]] for ''KOF XII''.

** In a non-fighting game example, ''VideoGame/MetalSlug'' has featured Ralf and Clark from ''VideoGame/IkariWarriors'' (in their ''KOF'' designs) [[CanonImmigrant as playable characters]] since the sixth installment. In return, Fio was a SecretCharacter in ''KOF Maximum Impact 2'' (one of two [[AlternateContinuity Alternate Continuities]] to the mainline ''KOF'' games) and explicitly recognizes her comrades-in-arms. Fellow soldier of fortune Leona (also from ''The King of Fighters'') later appeared in ''Metal Slug XX'', the UpdatedRerelease of ''7'', and ''VideoGame/MetalSlugAttack'' would eventually complete the set by adding in Heidern and Whip (along with many other ''KOF'' characters as playable units).
** ''VideoGame/PsychoSoldier'' is a loose sequel to the events of ''VideoGame/{{Athena}}'', featuring the goddess's descendant/reincarnation Athena Asamiya (another character who became a ''KOF'' staple). In an interesting aversion, neither ''The King of Fighters'' nor the direct sequel to ''Athena'' (''Athena: Full Throttle'') clarify whether or not the goddess Athena is related to Gaia, who is established as [[AllMythsAreTrue the mother of]] {{Orochi}} in ''KOF'' lore, like in [[Myth/ClassicalMythology the source material]].
* The connections between ''VideoGame/SaintsRow'' and Creator/{{Volition}}'s other big franchise, ''VideoGame/RedFaction'', have [[ZigZaggedTrope waned and strengthened]] throughout the years, primarily revolving around the villainous MegaCorp named Ultor, which is the driving force behind the colonization of Mars in ''RF''. As early as the original ''VideoGame/SaintsRow1'', the city of Stilwater hosted the Ultor Dome, featuring the Ultor corporate logos, and Ultor became a major power in the city by ''VideoGame/SaintsRow2''. Although it had merged with the 3rd Street Saints by ''VideoGame/SaintsRowTheThird'', weakening the connection; despite an audio cameo by Shaundi in ''VideoGame/RedFactionGuerrilla'', which seems to be the ''Saints Row 2'' version of her (granted Guerrilla came out before Saints Row 3 and it's developments), there are no mentions of the Saints as an organization. However one of SR3's two endings reinforced it again by having the main characters star in a movie about Mars, meaning that ''SR''!Ultor ''does'' have some interest in the Red Planet. And then it went right out of the window when the entire planet of Earth was blown up by the invading aliens in ''VideoGame/SaintsRowIV'' (it is very much intact in ''RF''). However, the shared universe, or rather, shared ''multi''verse was reestablished by ''VideoGame/SaintsRowGatOutOfHell'' and ''VideoGame/AgentsOfMayhem'', as the former had an ending that erased the Saints' entire timeline via CosmicRetcon, and the latter [[CuttingOffTheBranches established it as canon]]. ''[=AoM=]'' contains passing references to Ultor, so it presumably never gets bogged down in Stilwater in this timeline and eventually reaches Mars.

* ''WebAnimation/BattleForDreamIsland'' and ''WebAnimation/InanimateInsanity'' apparently share the same universe, as in the ColdOpening to one episode of II, Nickel mentions escaping the Locker of Losers from BFDI (and footage from BFDI is seen at that point), which hints to the Nickel seen in the mentioned episode of BFDI being the same Nickel from II (it helps that Nickel is voiced by Adam Katz in both BFDI and II). Now that Nickel is a regular character in BFDIA, it's unknown if this is still the same Nickel from II. Many ObjectShows also apparently share the same universe, as seen through {{Crossover Punchline}}s and [[CrossoverCameo cameos]], due to how close-knit the Object Show Community is.

* ''WebAnimation/IfTheEmperorHadATextToSpeechDevice'' shares a universe with several other videos made by the creator's friends, known as the TTS-Verse. [[https://www.youtube.com/playlist?list=PLyiDf91_bTEhDRwqQfqVwaKFeBaTVesHh A mostly complete playlist of all TTS-Verse videos is here]].

* All of Creator/AkaAkasaka's works occur in the same universe. This was established in a chapter of ''Manga/OshiNoKo'' wherein Ruby mentions having had a photoshoot done by one [[spoiler:[[Manga/KaguyaSamaLoveIsWar Kaguya]] ''[[Manga/KaguyaSamaLoveIsWar Shirogane]]'']]. Later on, ''Manga/RenaiDaikou'' features mentions Frill, Abiko, and ''Sweet Today'' from ''Oshi no Ko'' as well.

* All of Creator/AkaAkasaka's works occur in the same universe. This was established in a chapter of ''Manga/OshiNoKo'' wherein Ruby mentions having had a photoshoot done by one [[spoiler:[[Manga/KaguyaSamaLoveIsWar Kaguya]] ''Shirogane'']]. Later on, ''Manga/RenaiDaikou'' features mentions Frill, Abiko, and ''Sweet Today'' from ''Oshi no Ko'' as well.

* The ''Franchise/YuGiOh'' universe consisting of the NAS adaptation and at least some of its spinoffs.

* ''Manga/CaseClosed'' and ''Manga/MagicKaito'' exist in the same universe. In fact Kaito Kid is a reoccurring nemesis for Shinchi Kudo/Conan Edogawa, and is even his EvilTwin of sorts. Technically ''Manga/{{Yaiba}}'' would be in the same universe too, although that's more of a ShowWithinAShow.
* ''Manga/TeasingMasterTakagiSan'' and ''Fudatsuki no Kyouko-chan'' by the same author are in a shared universe. Mina, Sanae, and Yukari from ''Ashita wa Doyoubi'' make cameos in one chapter of ''Fudatsuki no Kyouko-chan'', while Mina Hibino herself is likely related to Haruka Hibino from ''Kyouko-chan''.
* ''Literature/SwordArtOnline'' and ''Literature/SwordArtOnlineAlternativeGunGaleOnline'' exist in the same universe and occur alongside each other, only focusing on different sets of characters. However the events from ''Sword Art Online'' are constantly mentioned in ''Gun Gale Online''. ''Literature/AccelWorld'' appears to exist in the same universe too, but it's set 21 years in the future from SAO so it's a lot less apparent.
* ''Literature/{{Oreimo}}'' and ''Literature/EromangaSensei'' take place in the same universe. Not surprising, as they're both written by the same author. [[spoiler:It wasn't too obvious in the beginning, but was made very clear when Kyousuke, Kirino, Kuroneko, and Saori make a cameo in Episode 11 of Eromanga Sensei.]]
* Creator/LeijiMatsumoto has a connected universe too -- of a sorts, since continuity has never been his thing. But you get [[Anime/CaptainHarlock Harlock]] showing up on the [[Manga/GalaxyExpress999 Galaxy Express]], ''Cosmo Warrior Zero'' saw the hunt for Harlock from the other side. ''[[Anime/SpaceBattleshipYamato Yamato]]'' would have had a Harlock encounter, but it was cut for time (but the ''Yamato'' has shown up in the background in some of ''Harlock'').

* ''Manga/BurnTheWitch2018'' and ''Manga/{{Bleach}}'' take place in the same world. [[spoiler:They're more connected than you'd think, as Wing Bind is revealed at the end of the pilot to be an English branch of Soul Society.]]

** ''Series/{{Friends}}'', ''Series/{{Seinfeld}}'' and ''Series/MadAboutYou'' shared the same universe.