Metal Gear Rising: Revengeance and Hi-Fi RUSH due to both being character action games that don't take themselves too seriously that center on a cyborg taking down a conspiracy made up of a series of unique, memorable, and charismatic bosses. It also helps that music is so ingrained in both games' identity, Hi-Fi Rush by design and MGR:R simply because the soundtrack is so memorable.
Considering the official website of ULTRAKILL has the URL devilmayquake.com, it shouldn't be too surprising that the ULTRAKILL community can often overlap with the ones for Devil May Cry and Quake.
In the Console Wars, fans of First and Second Party franchises of the console they are representing tend to have a good relationship with each other and are even fans of each other's games. Such examples include Halo and Gears of War for the Xbox front, Super Mario Bros. and The Legend of Zelda in the Nintendo front, and Killzone and Uncharted in the Playstation front. One could think of these groups of fans as members of sports team. They might butt heads at times, but they more frequently backing each other up against the opposing 'teams'.
Sharing a common console can also bring together third-party fanbases as well. Chances are that most Mega Man, Castlevania and 2D Final Fantasy fans will likely share a fondness for Nintendo games, while longtime PlayStation fans grew up with Final Fantasy VII and Metal Gear Solid, Xbox fans will favor Splinter Cell and Dead Rising, and old-school SEGA fans tend to also have nostalgia for Mortal Kombat and Soulcalibur. Then there are cases like Ninja Gaiden, where you may have fans who either started with the NES trilogy or with the Xbox revival, and Resident Evil, in which there is history with both the PlayStation fanbase due to the original trilogy starting on PS1, and the Nintendo fanbase due to the series going GameCube exclusive during the sixth generation.
Know someone who plays Tetris: The Grand Master? Chances are they also play BEMANI games and/or shmups. Conversely, Bemani fans and shmup fans view TGM as a new challenge that's worth giving a shot, instead of just crazy insane invisible antics.
DJMAX (or at least DJMax Technika) and BEMANI. Many Technika players have a history of playing Bemani games.
Within the Bemani franchise, it's hard to find someone who plays exclusively one Bemani series.
In fact, with the rise of non-Konami Japanese-developed arcade Rhythm Games such as maimai, Taiko no Tatsujin, and Groove Coaster, it's common to find players who find some combination of these games or even all of them.
Fans of In the Groove and Pump It Up have a chummy relationship with each other, due to both games being panel-stepping games with Nintendo Hard stamina-wiping charts that (for a while) put DanceDanceRevolution charts to shame. This fandom alliance eventually led to Andamiro designing the dedicated cabinets for In The Groove 2 and ITG devs returning the favor with the Pump It Up Pro spinoff line (as Konami had sued Roxor and acquired the rights toITG).
Strangely, the Fighting Game fandom, in some regions, has started to blend in with, of all things, the Catherine fandom. At many fighting game events, you can expect to see the host running a tournament for Catherine's versus mode. Who knew that block climbing would become as popular as 20-hit combos? Also, here is the finals for anUltimate Marvel vs. Capcom 3 tournament. You might notice that the game being played is not in fact UMVC3, but Bomberman. Yes, the grand finals for a UMvC3 tournament was decided over a round of Bomberman.
There's a considerable amount of overlap between Metroid and The Mandalorian, since both works are about bounty hunters who bond with infant alien creatures.
With Sega going third-party, these fans additionally appreciate Sega's games. Which is probably why Sega is included in the Namco × Capcom sequel Project × Zone.
Also worth noting that, unlike the notorious infighting in the Final Fantasy Series, most fans of Namco's Tales Series tend to be fans of multiple games - or, at the very least, they don't tend to actively hate on installments that aren't their favourites.
Historically fans of both franchises have been bitter to each other thanks to Sega famously disparaging Nintendo during the 16-bit era in their advertisements, leading to Nintendo responding in kind. However, since the death of the Sega Dreamcast and the multiple games on Nintendo consoles, the two fandoms have settled into a mostly Friendly Rivalry. Until he was confirmed for Brawl, Sonic was the most demanded guest fighter for Super Smash Bros..
One of the biggest signs of the two franchises' friendly rivalry is the shared positive response to the modern 2D entries Sonic Superstars and Super Mario Bros. Wonder, both of which were announced around the same time and were released within three days of each other. Both games are looking to be a very nice return to form after past controversial 2D game entries (Sonic the Hedgehog 4 and New Super Mario Bros. 2 respectively) with very beautiful and expressive animation and art-styles while also having completely new and unique looking environments and areas and multiple different playable characters (with Amy and Daisy being the biggest surprises).
A great majority of Metal Gear fans are also Silent Hill fans as well. It also helps that the two franchises are from the same company and that MGS creator Hideo Kojima had a hand in making the Silent Hill reboot Silent Hills until it got cancelled.
Fans of Far Cry 2 tend to love Metal Gear Solid V: The Phantom Pain; seeing it as the true Spiritual Successor in favor of the actual sequels. They prefer MGSV's tactical and systemic encounters and sandbox over the more casual, Rambo-esque power fantasies and comparatively railroaded approach to the open-world formula of the later Far Cry games. The similar themeing also helps; both games set in brutal desert warzones, collecting the odd Blood Diamond, and sometimes making use of a more fleshed out version of the "Buddy" system.
Regardless of one's opinions of the Far Cry series; everyone seems to love Blood Dragon.
Alot of FC2 fans also see Far Cry 5 as their second favorite in the official series. Appreciating it's more open structure, emphasis on emergent gameplay, and return of buddies.
The Ghost Trick and Ace Attorney fandoms, mainly because both games were developed by Shu Takumi, and both games feature his style of mystery writing and quirky characters. Were you to make a Venn diagram of the two fandoms, you'd have a smaller circle (Ghost Trick) inside of a larger circle (Ace Attorney). Furthermore, the Ace Attorney and Professor Layton fandoms were practically hand-in-hand even before the crossover was announced.
On a meta scale, this is a recurring aspect of the games made by Naughty Dog and Insomniac Games, probably due to the developers themselves being on friendly terms and often having crossover content between games (and in at least onecase, an outright crossover):
Probably due to a combination of both getting extremely rave reviews, having similar strategic gameplay, complete with perma-death, and similar emotional attachment to the characters, the fanbases of Fire Emblem: Awakening and XCOM: Enemy Unknown are pretty good buds with each other.
There is a large amount of overlap between fans of Devil May Cry and Bayonetta. Seeing as how both games have similar gameplay, and both their first games have the same director, this was obvious. There's even tons of crossover art of Dante and Bayonetta.
Devil May Cry fans also get along well with Ninja Gaiden fans ever since the former franchise was revived in the 2000s as a Hack and Slash game series.
Doom fans also overlap with DMC players due to both series starring pizza-loving, Demon Slaying heroes, and featuring Rock 'n Roll and Heavy Metal soundtracks. Since the late 2010s, there seems to be some crossover between Doom Eternal and Devil May Cry 5 fans, withis quite abit of fanart portraying Dante and Doomslayer as friends. Doom (2016) and Doom Eternal especially are praised for having combat sandboxes not unlike stylish character action games.
Fire Emblem and Valkyria Chronicles fans have an easy time getting along with each other given that both are turn based Strategy RPG games that are all about commanding a Band of Brothers and Fire-Forged Friends to victory. While Fire Emblem focuses on fantasy grid based combat and Valkyria Chronicles has elements of a WWII third person shooter, both games also place emphasis on unit types and positioning your army in a way to better intercept the enemy's weaknesses. Thematically, both series also place a large emphasis on the bonds between the members of your army, with skirmishes and side stories focusing on your squadmates also being useful to unlocking extra upgrades. Stylistically, both games are drawn in a fundamentally anime style with western influences, with Fire Emblem taking inspiration from European fantasy and fairy tales while Valkyria Chroniclesaims to imitate the style of a watercolor painting or sketch book one could find in interwar Europe, if the artist knew how to draw anime. It's for these reasons that one can call Valkyria Chronicles as "Fire Emblem in WWII or Fire Emblem as Valkyria Chronicles in the Middle Ages or Renissance."
Bayonetta is paired up with Kratos a lot too. And some people have also noted similarities between her and Juliet Starling as well.
Undertale and OFF share many fans, due to similarities in graphics, monsters, and protagonists, as well as each having a shockingly dark storyline and showing you the consequences of killing everything in your path.
Similarly, fans of both of those works tend to get along with fans of LISA for the similarities to games like Mother.
OMORI fans also get along well with Undertale ones, partially due to the fact that the creators of both worked on each other's gamesnote The Undertale monster Woshua was reportedly based off of OMORI's developer Omocat, while OMORI contains a song titled "Another Holiday" by Toby Fox, as well as the fact that both games start off cute and then reveal dark secrets about the plot, as well as them both being Role-Playing Games with a cast of quirky and colorful characters. OMORI also shares fans with Doki Doki Literature Club!, another Disguised Horror Story with an uncannily similar tragic plot twist.
The BioWare and Obsidian Entertainment fandoms have a tremendous amount of overlap and are very friendly toward one another. This starts with the creators themselves, with Obsidian often taking over projects that Bioware doesn't want to reprise. Both companies have their own flavors of high-quality, story-driven RPG, and fans tend to enjoy both.
The Monster Hunter and Dark Souls fandoms have a very low percentage of people who hate the other series; a lot of Dark Souls fans are also fans of the Monster Hunter games and vice versa, perhaps due to similar gameplay styles. Most forum threads comparing the two are met with comments about how they love and play games from both series. Besides, Dragon's Dogma is often seen as a hybrid between the two franchises and is well-liked by both fandoms.
Following Bethesda's acquisition of the Fallout franchise, a strong union has formed between fans of Fallout and Bethesda's other flagship property, The Elder Scrolls series. While the Fallout fandom has some very strong, differing opinions on the direction Bethesda has taken the series (starting with Fallout 3), Elder Scrolls fans have flocked to the Bethesda-produced Fallout games, and vice versa. One major reason is that Bethesda places a strong emphasis on Worldbuilding, which is one of the greatest strengths of each series. Another is the similar gameplay, with the Bethesda Fallout games adopting The Elder Scrolls trademark Wide-Open Sandbox worlds and Western RPG elements. Heck, Fallout 3 and Fallout: New Vegas were made using the same engine Bethesda used for Oblivion, and Fallout 4 used a modified version of Skyrim's engine. This was made recursive when the Bethesda released the SkyrimSpecial Edition which was updated with the Fallout 4 engine and graphics enhancements.
Ever since id Software was acquired by Bethesda's parent company ZeniMax Media, these fandoms have even overlapped with those of id's franchises, including Doom, Quake, Wolfenstein, and Rage (2011), all of which Bethesda has since had some sort of involvement in. The same goes for Prey (2006) after Bethesda acquired it.
Master Chief and Doomslayer are often depicted as step-brother icons of the FPS genre, especially after Microsoft bought Bethesda.
Fans of Donkey Kong Country tend to also be fans of other series Rare Ltd. has worked on like Banjo-Kazooie and Conker's Bad Fur Day. Not only did the protagonists of the latter two series make their debut in a spin-off to the former, but much of Rare's humour and style tends to be kept similar among the different games they've worked on, partly because they're implied to take place in the same continuity and most importantly, the Furry Fandom.
The Disgaea and BlazBlue fandoms, despite both games being entirely different genres, seem to get along with each other. And both games have their good mix of quirky silliness and dramatic moments and both games are known to have a strong use of Moe.
Both Mighty No. 9 and Shantae: Half-Genie Hero launched their Kickstarter campaigns roughly around the same time, and the fandoms for both series not only get along swimmingly but also cross-promote each other! Exemplified in this◊ piece of art from one of the artists at WayForward.
With the Kickstarter for Yooka-Laylee, Mighty No. 9 fans have started to form a bond with Yooka-Laylee fans.
As of the eighth console generation, PC fans and Nintendo fans seem to be on much better terms with each other than with the Microsoft or Sony communities. This stems from a few sources - among other things Wii, 3DS, and Wii U games were usually completely exclusive, which erodes the usual PC "it'll get a port" attitude, and PC gamers tend to already possess a good-sized library of Nintendo games through emulation, which makes it hard to hate them. The eighth generation, though, seems to have solidified this attitude - particularly during E3, when many bemoaned the PS4 and Xbox One as being crappy PCs in disguise that touted useless gimmicks rather than actual games, many PC gamers strongly respected Nintendo for doing something new and different and focusing purely on the "gaming" aspect. The Nintendo Switch continued this trend, as it offers a great HD gaming experience on the go for players who can't take their top of the line PC somewhere and usually see laptops as either underpowered or overpriced.
The Virtua Fighter and Dead or Alive fandoms are an interesting case; the creator of Virtua Fighter, Yu Suzuki, gave Tomonobu Itagaki pointers when he was creating the first Dead or Alive game. Itagaki is infamous for his attitude towards rival companies and games, especially Namco and Tekken, but Virtua Fighter is the one fighting game he has great respect for. The first DOA game was made for Sega's Model 2 arcade board, the first time Sega licensed the hardware, and the same board Virtua Fighter 2 was released on. Even after Itagaki left Tecmo, Sega helped Tecmo with Dead or Alive 5 and Virtua Fighters were featured as guest characters, so needless to say the developers of both series are on good terms. The two series even have similar button layouts. Between fans, it's more of a mixed bag. Some hardcore VF fans see DOA as being shallow, while some DOA fans think of VF as being boring. On the other hand, there is still a lot of overlap between the fandoms. VF players have gotten into DOA because of the guest characters in 5, who have overall have been well received by the DOA fans, and many are hoping for a real crossover between the two series in the future.
Mario Kart and Super Smash Bros. fans get along well, with both being first-party multiplayer party games with popular online communities and many characters. It helps that Smash Bros. contains a subset of Mario Kart content, and the Mario Kart 8 DLC packs introduced content from outside of the Mario universe. They also share a common hatred of Moveset Clones, Low-Tier Letdown characters, and intrusive items.
Sonic the Hedgehog and Mega Man fans are very close with one another, with most people who like one having at least a passing interest in the other. At first this was just for cosmetic reasons (both have blue-colored protagonists, mad scientist main villains, mixing of sci-fi and fantasy, heavy presence of robots, etc.) but the two series became inseparable after the comics based on them got the same writer and an absolutely awesome crossover.
Mass Effect and Halo fans really get along with each other, possibly because their stories go in completely different but equally valid directions from similar bases. It also helps that the first Mass Effect was funded and published by Microsoft prior to Electronic Arts buying out BioWare, and was released in the same year as Halo 3, with both games being giant killer apps for the Xbox 360. Crossovers between the series make up some of the most popular fanfictions on the net. Destiny seems to be joining this group, turning it into a Power Trio of sci-fi game fandoms.
KanColle fans and Touhou Project fans tend to have a good amount of overlap, because both series feature many characters and anthropomorphic personifications of Japanese history (The Imperial Japanese Navy for the former, Japanese religion and mythology for the latter) and are ripe sources for memes. Even Touhou creator ZUN himself has good things to say about KanColle. This happens to a lesser extent though, with World of Warships. The latter had a reasonable influx of KanColle fans upon announcement of the Closed Beta sessions since both games have featured vessels from the Imperial Japanese Navy. This does sometimes swing into Fandom Rivalry of sorts due to players not familiar with KanColle getting annoyed by the abundance of Yuudachi's "Poi~" in the in-game chat.
Fans of classic 8-bit computer platforms such as the Commodore 64, Apple ][, Atari 8-Bit Computers, ZX Spectrum and the MSX, once bitter rivals in the Computer Wars in the '80s, have settled into this relationship after their platforms were discontinued. The proliferation of emulators on modern systems certainly helps, letting fans experience each other's platforms. PC fans also like classic consoles, including Nintendo and Atari. PC fans point to the ability to run emulators as one of the platform's strengths.
Fans of Microsoft Windows and Android are generally friendly toward each other because there's no real competition between the two operating systems (Windows mostly being for laptops/desktops as opposed to Android being for mobile devices), as well as having a common enemy, Apple. Android also gets along well with Linux users for the same reasons as Windows, and also because Android itself is Linux-based. Now that Windows runs Linux with WSL, some Linux users have found themselves supporting longtime rival Microsoft, though there's still quite a bit of distrust on the Linux side, with some Linux advocates accusing Microsoft of trying to take over Linux. On the Apple side, Apple and the BSD community get along very well due to macOS using the FreeBSD userland.
For similar reasons above, especially in parts of Asia, PC gamers tend to get along with mobile phone gamers for relatively low-cost and free-to-play digital-download games and free online play, not to mention their platforms' openness to indie game developers and wider accessibility. Many e-sports tournaments in Asia tend to focus on PC games and mobile games, and some Asian PC gamers are also Asian smartphone gamers (and vice versa, even if sparingly). Not to mention, China being one of the largest production nation for PC components, smartphones and e-sports games, courtesy of their organized trade unions to reduce overall costs, have helped in this.
PC gamers tend to like classic arcade games (both physical machines and emulation/home ports) for the same reason they like Nintendo games: it offers an experience they can't get on PCs or consoles, especially with real arcade cabinets.
In the mid-2000s, due to several crossovers between the two series, fans of Capcom's Mega Man Battle Network and Konami's Boktai have become quite friendly with the other.
Nintendo fans tend to have a lot of overlap with the Bomberman fanbase due to Hudson Soft's extensive history with Nintendo, Bomberman's presence on every single Nintendo platform (except the Wii U outside of Virtual Console releases) and his starring role in Nintendo's first crossover with another company. Around the releases of Super Smash Bros. Melee and Super Smash Bros. Brawl, he was one of the most requested third-party characters to appear in the series (right up there with the likes of Sonic the Hedgehog) and a leak of the official roster for Brawl was dismissed by several Smash communities due to his absence. His inclusion as an assist trophy in Super Smash Bros. Ultimate is bittersweet as his character designer Shoji Mizuno passed away on June 11, 2018, six months before the game released.
Because their Kickstarters both aired at the beginning of June 2015, there are many people who are fond of both Bloodstained: Ritual of the Night and Yooka-Laylee with many fans contributing to both of their campaigns and welcoming the return of some retro classics.
While in the modern era, Nintendo and Sony are locked in a battle to the death, Sony Playstation fans tend to also love the Super Nintendo, and see the Playstation, rather than the later Nintendo consoles, as the true Spiritual Successor to the Super Nintendo.
Sony Xperia users who played mobile games based on Nintendo franchises like Miitomo and Pokémon GO have better relationships with Nintendo and Sony, due to Sony Xperia devices running on Android systems and Nintendo does have Android (and iOS) games based on their franchises. It's also worth saying that Nintendo and Sony don't have rivalries outside of consoles.
A surprising chunk of PC-gamers have a soft spot for Nintendo, enjoying their unique and quality titles that hinge on fun over power and looking down on other consoles for being "pale imitations" of/or inferior ways to play PC games. There is also another chunk for Playstation, for their variety of exclusives.
Nintendo and Xbox fans have been pretty chummy as of late. With Sony being so reluctant to support cross-play in games like Minecraft and Fortnite, and several acclaimed Microsoft published indie-games like the Oriseries and Cuphead being ported to Switch. The "Better Together" ad campaign was the icing on the cake.
Fans of Yooka-Laylee have come to be friendly towards fans of Super Mario Odyssey due to their gameplay centering around the exploration of various sandbox worlds, as once envisioned in the fifth generation of gaming, a la Super Mario 64 and Banjo-Kazooie. Both games are slated for release on the Nintendo Switch.
It's not uncommon to come across people who play both Fate/Grand Order and Granblue Fantasy; both are mobile role-playing games with lots of attractive characters (including those that fall under Mr. Fanservice and Ms. Fanservice), each of which has their own distinct voice actor.
The Fate/Grand Order fanbase is also in good terms with Magia Record fanbase due to the gameplay similarities between the games, and both being distributed by Aniplexa.
There's a decent amount of overlap between the Wario Land and Shantae fandoms, due to their status as collectathon orientated 2D platformers with detailed graphics that first originated on the Game Boy/Game Boy Colour.
There is overlap between the WarioWare and Rhythm Heaven fandoms. Probably because they're both microgame collection titles created by Nintendo SPD1 that share their art director.
The Mortal Kombat fandom tends to get along well with the Doom fandom, due to both being controversial, ultra-violent games from The '90s, to the point that the Doom protagonist was a popular request for a Guest Fighter.
After the Paladins "Cards Unbound" update caused massive backlash, many players abandoned the game and were in need of a new free-to-play multiplayer action game. Many of these people chose Battlerite as their new game of choice, and were welcomed with open arms by the BR community. Even when "Cards Unbound" was later removed and many of the disgruntled players came back to Paladins, some still play Battlerite as well.
With both Fire Emblem and Persona experiencing a significant Newbie Boom around the same time, there is a burgeoning solidarity between fans of both series. This is due to how both series are different styles of RPG, and both series' side content emphasize character interaction through Relationship Values with a gameplay-related reward. With Fire Emblem: Three Houses apparently taking much inspiration from Persona in terms of mechanics, setting, and themes, the relationship between fandoms grew even further.
This crosses also into Shin Megami Tensei x Fire Emblem as a whole. After Persona 3 introduced many western fans into SMT, Fire Emblem fans took a shining to Devil Survivor due to the grid-based combat and found the relationships between the cast and tone (thanks to Devil Survivor) akin to a Fire Emblem Game.
Next came up the actual crossover that was Tokyo Mirage Sessions ♯FE, where Fire Emblem characters featured as the Fighting Spirit Persona-equivalent used by the protagonists, with the gameplay (combat and social sidequests) taking cues from Persona, although the game being overtly Lighter and Softer than either franchise and surprising idol theme united both fandoms in terms of wondering what to make of the story.
After the "divisive" reception of World of Warcraft'sBattle for Azeroth expansion, many fans ran into the open arms of Final Fantasy XIV just in time for its third expansion, Shadowbringers. It is honestly not uncommon for former WoW fans to put up video guides for disillusioned players to come on over to FFXIV.
At first there was a Fandom Rivalry between the Team Fortress 2 fanbase and the emerging Splatoon fanbase, but both games ended up having enough in common for one fanbase to become interested in the other; with both games being team and objective-focused shooters with very cartoony aesthetics, incredibly silly antics and most importantly, hats.
Overwatch, which started with a bitter Fandom Rivalry between it and Team Fortress 2 for its perceived art style and team-based gameplay. However, as time has gone on, more and more people have played both games and have started to appreciate both equally for their unique appeals and gameplay differences. Now many Team Fortress 2 fans are also Overwatch fans and vice versa, which is why there are so many crossover works between the two. There's still a rivalry to a degree, but it's not nearly as bad as it was.
The Sixth Generation of Console Video Games saw a large number of lower-budget, colorful action adventure games released that didn't make a large market impact, but nonetheless achieved Cult Classic status. Games like Sphinx and the Cursed Mummy, Beyond Good & Evil, Kya: Dark Lineage, and Ty the Tasmanian Tiger among others. A lot of these lesser-known games from this era tend to have significant overlap in fandom, especially because lists of "best overlooked games" from this era focused on them. This effect has become more pronounced with time, as many of these games have since received remakes, and a number of YouTube reviewers like Nitro Rad and AntDude have done many reviews of these games.
Doom Eternal and Animal Crossing: New Horizons both ended up delayed to the same date, leading the two fandoms to commiserate together. This progressed to Memetic Mutation about people struggling to decide which of the (completely, absurdly different) games they'd play first, thanks in no small part to the official Doom Twitter account, and crossover art that is at once absurd and, given Doomguy's subtler characterization, entirely plausible. The most popular way this manifests is the fanon of Doomguy making friends with Isabelle, leading to many a fanart of the tough, heavily armored Doomslayer chasing butterflies with a net, and the small anthropomorphic dog Isabelle tearing through hordes of hellspawn with weapons bigger than she is, the Super Shotgun most often of all.
There is a lot of overlap between fans of Doom and Metroid, particularly due to the protagonists of both series being similar in characterization. The fact that Metroid Prime influence started creeping into the Doom series following the reboot also helps.
Fans of the Doom series are being friendly with the Mega Man (especially with Mega Man (Classic) along with the Sequel Series of the Mega ManMultiverse) fan community (despite the fact Rock aka Classic Mega Man himself is an Astro Clone, Doomguy and Classic Mega Man are Sci-Fi Gaming heroes who wear Powered Armor).
Most strangely; the action-game fandom with The Last of Us Part II, despite a vehement Fandom Rivalry with the first The Last of Us. It's apparent the lack of reverence for the original numbs them to the Broken Base elements of the sequel. That and more importantly the gameplay takes a much larger focus and creates a much more dynamic action sandbox for those undistracted by the story. It could also be them trying to spite fans of the original for allegedly "ruining" gaming by turning the tides in favor of so called videogame Oscar Bait.
The Killzone and Resistance series have a big fanbase overlap due to both being dark, gritty first-person shooter franchises exclusive to Playstation systems and alternating releases during their largely simultaneous run.
After the release of Yakuza: Like a Dragon, the Like a Dragon fandom enjoyed a strong overlap with the Persona fandom, largely thanks to Like a Dragon's Genre Shift from a beat 'em up to a JRPG with slight influences from Persona 5 (mostly boiling down to the social stats and the Bond events, which act similarly to Confidants, equally intuitive battle systems,note Although Like a Dragon's battle system is more outwardly inspired by that of Dragon Quest overlapping English voice actors and a surprisingly similar leading character ensemble). Dancing in Starlight having featured a costume DLC based on Like a Dragon and both franchises being owned by Sega certainly helped matters, as well as the fact that both were largely niche franchises that skyrocketed in popularity around 2017, when both Persona 5 and Yakuza 0 were released. The bond between the two fandoms only became tighter with the release of Persona 5 Strikers, which drops a rather unsubtle Shout-Out to Like a Dragon early on; Makoto Niijima would be proud.
The Dead Cells, Rain World, Hollow Knight and Hyper Light Drifter fandoms tend to get on pretty well, with all four being Metroidvania-inspired or outright metroidvanias with distinctive art styles and at-times punishing difficulty. That all four games are set in the aftermath of a civilisation's fall and involve a disease as a major plot element probably doesn't hurtnote the Drifter in HLD is looking for a cure for their ailment in the ruins of a dead civilisation, the Beheaded in DC is adventuring through a kingdom destroyed by the Malaise, Rain world's cancer-like rot is a key plot element infecting the remains of a civilization, and most of the Knight's enemies throughout the ruins of Hallownest in HK are affected by the Radiance's infection.
Most Shall We Date? players play all the games in the franchise, but some don't. Even those that don't are usually very friendly with those who play different games in the franchise.
The Walking Dead: The Final Season and Life Is Strange 2 have a lot of fans in common, due to similarities in characters and genre. Both are episodic, choice-based adventures games starring a bisexual teenage protagonist of color who has to take on a protective elder sibling role for a much younger character, whose development is informed by the player's choices. It probably helped that The Walking Dead: The Final Season ended when Life Is Strange 2 was less than midway through its release, giving fans of the former who were eager for another similar game time to clue in to the hype and get caught up on the first couple of episodes.
As the years have gone by and the latter series became multi-platform instead of a PlayStation-exclusive, good relations have started to develop between fans of the Donkey Kong Country series and fans of the Crash Bandicoot series. This is because both series share many similarities, such as heroes that are cartoonish animals, villains associated with polluting factories and technology, settings that are tropical islands, a big focus on woodencontainers, main collectibles that are some sort of tropical fruit, and generally high-difficulty platforming. Fans of both series tend to see the original Crash games as the true spiritual sequels to the original Donkey Kong Country trilogy.
Fans of OpenTTD often play Factorio, and vice versa. That's not surprising once you consider how many features they share. On a macro scale, both games revolve around transporting cargo to other places. Players often create massive and complex networks to do so efficiently. Their signalling systems are similar, and can often be translated from one game to the other. While there are some differences (there are bridges and tunnels in OpenTTD, and Factorio's cargo system is considered more complicated), it's safe to say fans of one game will feet quite comfortable playing the other.
Fans of Project Wingman are also fans of Ace Combat. It helps that the game was made by a team of Ace Combat fans who were waiting for Skies Unknown, though the game came out a year afterwards since the developers consisted of a team made of only three people. Nonetheless, Project Wingman is considered to be well made Ace Combat fangame that stands out on its own two legs.
Fans of Legacy of Kain, Thief, and Deus Ex, three Eidos Interactive-published series, are all tightly-connected due to Eidos more or less ignoring these franchises in recent years.
On the topic of Germans Love David Hasselhoff, the Spanish Plants vs. Zombies fandom shares a lot of fans with the the Spanish Angry Birds fandom, due to both being released in 2009 and both being very popular mobile games back in the day. note Plants vs. Zombies started on PC, but the mobile port is better known to many people.
Many fans are shared between Elden Ring and Kirby and the Forgotten Land, surprisingly in a case of fandoms mingling not in spite of, but because of the two games being complete opposites in every way. Because the two games were released only one month apart, fans and journalists alike found that Elden Ring's dark atmosphere, brutal combat, and perilous Wide-Open Sandbox and Kirby and the Forgotten Land's cute atmosphere, forgiving combat, and relaxing linear level design made the two games perfect complements to one another. As such, many found that Kirby served as a great laid-back experience to wind down from Elden Ring, while Elden Ring could likewise serve as a more intense experience for those who finish Kirby first and want more of a challenge.
F-Zero and Darkstalkers share a lot of fans due to a few strange, yet shared circumstances. Both franchises' lead characters are more well-known than their own franchises (Captain Falcon and Morrigan Aensland), both franchises are better-known for their content making crossover appearances in other games (F-Zero in Super Smash Bros. and sometimes Mario Kart, Darkstalkers in the Capcom vs. series), and both franchises' fans feel neglected due to their franchise being overshadowed by another franchise in terms of mainstream recognition and sales (F-Zero with Mario Kart, Darkstalkers with Street Fighter). Due to these similar states of affairs, it's not uncommon for F-Zero fans and Darkstalkers fans to find solace in one another.
Despite their differences, there is a surprising amount of overlap between fans of Team Fortress 2 and Deep Rock Galactic.TF2 might be more of a multiplayer team-based FPS and DRG might be more of a squad-based collaborative horde shooter, but they share a few points of commonality, particularly due to Mann Vs Machine mode which transforms TF2 into a squad-based collaborative horde shooter. Fans from one game often find themselves easily sliding into the other, due to a shared love of the distinct classes, unlockable weapons, a breathtaking bounty of cosmetics, and the fact that both the TF2 mercs and DRG dwarves are equal parts charismatic idiots and violent bumblers to some degree.
Pizza Tower and Celeste seem to be rubbing elbows a lot since the former's release. Whether it be depicting Peppino as a confused yet supportive trans ally to Madeline, or Madeline attempting to soothe Peppino's utterly rampant anxiety, the two indie platformers mesh surprisingly well in spite of their tonal dissonance.
The Metal Gear series and the Drakengard/Nier series are loved by many of the same people thanks to their respective creators Hideo Kojima and Yoko Taro having similarly bizarre tastes and senses of humor, their convoluted-yet-logical approaches to worldbuilding, their similar deconstructionist mindsets to common tropes in media, and their storytelling approaches that mix conventional cutscene and dialogue with playing with player expectations and agency. It helps that PlatinumGames has been involved with both franchises, having a hand in both Metal Gear Rising: Revengeance and NieR: Automata.
Stellaris and Rimworld fandoms overlap quite a bit due to their love of committing virtual war crimes, albeit at a vastly different scales.
The relationship between Kingdom fans and those of Jurassic World: Evolution is decidedly mixed between this and Fandom Rivalry. Some vitriol gets thrown around over which game is better, with Kingdom fans pointing out it is more accurate and actually includes Cenozoic animals, while fans of Evolution will say it has a bigger roster and better animation. Expect angry remarks on both fronts. On the other hand, many fans of one are fans of the other; with prominent Youtubers and modders that once exclusively covered Evolution happily endorsing Kingdom for its merits. While the two games are both park builders, the detailing in how the parks are made and the animal behaviors therein do differ starkly and this contributes to the differing reactions - Evolution is more focused on spectacle (especially with dinosaur battles) while Kingdom is more creativty and immersionas not only must you contend with mundane tasks such as cleaning exhibits and restocking stores, the maps in Kingdom are much larger than in Evolution which, combined with modular structures allows you to spend hours designing a park just how you want it.
, it shouldn't be too surprising that the ULTRAKILL community can often overlap with the ones for Devil May Cry and Quake. 
