Dean: There's Sam Girls and Dean Girls and... What's a slash fan? Sam: As in Sam slash Dean. Together. Dean: Like together, together? Sam: Yeah. Dean: They do know we're brothers, right? Sam: Doesn't seem to matter. Dean: Oh, come on, that... that's just sick!
The most common definition has Slash as a Fan Fic that pairs two (or more) characters of the same sex. Often, "slash" is used for male/male pairings only, with "femslash" or "femmeslash" used for female/female pairings.
The more lopsided the male-to-female ratio in the original work, the more common it is to have slash pairings rather than straight pairings in the fandom.
Slash is often also used to pair up Heterosexual Life-Partners. Of course, some canonical works, especially Boys Love and those with a Cast Full of Pretty Boys, invite such reading by playing the ambiguity for all its worth. It's also common to (sexually) pair characters who are nemeses in the source material, in Fan Fic's own version of Slap-Slap-Kiss, Foe Yay and The Masochism Tango. Some Slash Fics are so low in erotic and romantic content that although they focuses on the relationship between two same-sex characters, it's not obvious if they're slash or not; they're closer to Ho Yay themselves. Such fics are often called PreSlash or slash-if-you-squint.
The origin of the term predates the World Wide Web, going back to 1960s fanfic writers, specifically those interested in Star Trek, who wrote "Kirk/Spock" fiction, pronounced "Kirk Slash Spock". In many communities, the ordering of the names is used to indicate a powerrelationship, and who exactly is the dominant member.
See also Lemon, Porn Without Plot, Everyone Is Gay, Yaoi Guys, Yaoi Fangirl and Most Fanfic Writers Are Girls. Not to be confused with fics about the guitarist from Guns 'n' Roses. Also, Slash Fic has absolutely nothing to do with Slasher Movies; if you are looking for that kind of Fanfic then you should probably check out Dark Fic.
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Anime & Manga
Ranma 1/2 is unique in that since the title character has two forms - one of each gender - poor Ranma has been cast in Slash Fics with almost every single cast member. Including his official heterosexual love interest. And him/herself.
Also Simon/Boota, which is either this or bestiality depending on if he's in his human form or not.
Naruto and Sasuke share a Canonkisson screen, however, it wasn't voluntary (which fangirls refuse to believe) and they were both gagging in disgust afterwards. Kishimoto has came on the record it was a joke scene, saying 'never have rivals kissed before'. Sasu/Naru is practically the Official Couple for a few people, mostly fangirls. Not to mention all of the other various slash pairings.
Which is, by the way, incorrect in a way. While this was in a dream sequence (it's a long story), rivals Kuwabara and Yuusuke from Yu Yu Hakusho kissed in an early episode.
Don't forget that Itachi/Sasuke are really popular, in spite of the fact that Itachi and Sasuke are brothers.
Believe it or not, Gaara/Lee is a pretty popular pairing. It's been made famous by Maldoror_gw's Diplomatic Relations. 
But remember when L and Misa first met? He was looking at her.
The fact that Misa, Light's girlfriend, does not have much of a personality outside of her love for Light also contributes. Light also makes it pretty clear to Ryuk that he has absolutely no romantic interest in her.
At the rate Bishōnen characters in Katekyo Hitman Reborn! is increasing, fanfic writers will soon run out of numbers and alphabet to denote the number of possible pairings availiable.
And most of them will involve Tsuna. Typically as the Uke.
Neon Genesis Evangelion is almost plagued with Kaworu/Shinji fics, though the shower room scene definitely has slashy overtones and the dating sim tie-in game had this option.
The Kaoru/Shinji Ho Yay gets even more intense with each iteration: In the manga, there are two Does This Remind You of Anything? moments, one of which is in the shower. To give you an idea, in both moments, their penises are just inches away from each other, thus averting the seme / uke roles.
Doesn't help that even in the original Canon, the fallout from the broken relationship of those two was one of the last nails in the Coffin to Shinji's Psyche and the subsequent End of the World. Of course, the one that dealt the actual killing blow was Asuka...
Gendo Ikari/Kozo Fuyutsuki fic, which is a "What subtext? Where?" pairing, since both guys were involved with Yui on some level (Gendo was married to her and destroyed the world to get her back; Fuyutsuki was her mentor and carried a torch for her for over fifteen years).
There's also quite a bit of Greed/Ling slash. As well as stuff shipping one or both of them with Ed.
For those who prefer Roy with someone closer to his own age, there's a good deal of Roy/Hughes and Roy/Havoc as well.
Envy/Ed used to be fairly popular with fans of the first anime, though it's far less common among manga/Brotherhood fans and seems to have died down in general in the past few years. HeiEd - Ed with Alfons Heiderich, Al's Identical Stranger in Germany - is also one of the more popular slash pairings in the FMA1 fanbase.
Femslash is much rarer, because of the lack of meaningful relationships between female characters compared to those between male ones, but among the more common pairings are Winry/Sheska (for fans of the original anime) and Winry/Riza (for fans of the manga/Brotherhood). Olivier Armstrong also gets shipped with other ladies a lot.
Sailor Moon is known for its fandom putting together any two female characters, even though the series has two canon lesbians already. And by Stars, four, if you count Lead Crow and Aluminum Siren.
Pick any combination of characters to have ever appeared in Pokémon. There is slash of them. Ash/Gary seems to be especially popular.
As far as Foe Yay goes, Ash/Paul is pretty popular. Things like Roark asking who Ash was thinking about when they battled didn't help.
Not to mention all the slash written between trainers and their Pokemon.
Especially Alucard/Young!Walter, since in Hellsing The Dawn, Walter is a teen Bishounen and Alucard takes the form of a young, cute girl.
Harukanaru Toki No Naka De, a Dating Sim-originated Cast Full of Pretty Boys where this was completely unavoidable. That is, it involves eight guys who are already paired up with each other due to the way their powers work. The Genbu pair (Eisen/Yasuaki) seems to be one of the most popular choicesnote mainly because of the possibility of exploring the plot about The StoicArtificial Human Yasuaki developing emotions (out of love for Eisen, naturally)]]/note]]; the Byakko pair (Takamichi/Tomomasa) also pops up often in fanfics[[note]]as if they didn't have enough Ho Yay moments in canon already. And you can always make an original pairing if you want to (speaking of which, Tomomasa/Yasuaki fanfics definitely do exist out there...). Or, if you don't think that Het is Ew, just pair the main girl with you favourite guy.
The same, of course, applies to the sequels, which have different characters but with the same... eh, bonds.note If that still isn't enough, you can try crossover fics with all four games — that's 32+ guys and a few girls.
Gundam Wing fanfics is generally this. Heero/Duo and Trowa/Quatre seem to be the most popularnote the latter being almost canon, but the former being despite Duo himself shipping Heero/Relena, but there are also a lot of works where the whole crew was having sex one after the other. Poor, poor Relena... in most of these fics she's either abandoned or dead.
Wufei/Duo, Treiz/Wufei, Zechs/Wufei, and Treiz/Zechs/Wufei are all really popular too. In fact, the fandom seems to assume that being gay for one another is a prerequisite for being a Gundam Pilot.
For the girls you get Relena/Dorothy, Relena/Hilde, Relena/Noine, and Sally/Une. That last one is mostly set in Endless Waltz/Preventers.
Ouran High School Host Club, the show that practically has the characters pre-paired for your convenience note (Kyouya/Tamaki, Hikaru/Kaoru, Honey/Mori if you're feeling adventurous) naturally has quite a bit of this, and most of it is of the couple nearly every female in the show ships already (the twins). However, other pairings are out there (Kyouya/Kaoru seems to be popular for whatever reason).
It's not just the guys. There is some oh-wait-you're-a-girlyuri between Haruhi and Renge. And some where Renge never finds out, for that matter.
Axis Powers Hetalia. You can pair up just about any two characters in this series and have it make sense historically.
Poor Death the Kid. If you were to look through a majority of the lists of the Yaoi Fangirls of Soul Eater, you would find that Kid has been paired up with almost every male in the series (This includes his father).
Bleach is a well known target for Slash Fic as around 80% of all fanfics listed on the internet is about either two members of the male cast, or about two members of the female cast. The main character Ichigo Kurosaki is easily paired with more or less all of the male cast, although there are favorites. In addition to many other pairings that are quite typical.
Ichigo/Grimmjow seems to be a typical pairing of the fanon, given the duo's similar personalities and of course the fact that Grimmjow is pretty much Ichigo's Evil Counterpart. Which only seems to intensify this pairings popularity. There is also a good deal of innuendo in the actual Bleach storyline which serves to only add fire to the fuel.
Ichigo/Renji orignated shortly after the infamous "take it off" scene shortly before the Bount Arc and has only intensified over the course of the anime, as fillers, sentences and even official artwork which did nothing to stop the fangirls or fanboys.
Other pairings include Renji/Byakuya, Grimmjow/Ulquiorra, etc.
X-Men. Ohsoverymuch. Wolverine, Gambit, and Iceman are far and away the three biggest sluts on the team, if the fics are to be believed. But you could probably play the Heroes dartboard game with any of guys on the team. Even the villains get to ride quite a bit, namely the "sexier" ones like Sabretooth and Magneto, though I'm sure Apocalypse joined the party at least once.
Nightcrawler also has his share of fangirls, and as such does end up in a lot of pairing fanfiction. The most common slash fics he ends up in tend to be with Wolverine, since they are often portrayed as best friends.
Batman/Superman has its fandom. Possibly influenced by the DC title Superman/Batman, which "explores the camaraderie, antagonism, and friendship between its eponymous characters," to quote The Other Wiki. Preceded by The Batman/Superman Hour in 1968, which merely aired episodes of either show back-to-back.
The Batman/Gotham City universe is a virtual hotbed of slashy relationships. Batman and Joker finally consummate their true feelings for one another. Dick Grayson/Bruce Wayne or Dick Grayson/random male villain. Jason Todd/Bruce Wayne before he died and resurrection. Dick Grayson/ An aged up Damian Wayne. Colin Wilkes/Damian Wayne. Joker often has his way with Harvey Dent. Dr Crane and Bruce Wayne make a startlingly hot pairing, but Crane is also often paired with blink-and-you'll-miss-him Dark Knight character Thomas Schiff. And Bruce Wayne/Commissioner Gordon already has its own lj community.
Booster Gold/Blue Beetle has a quiet, friendly, prolific, extremely committed fanbase, with the obligatory LJ community, sprawling AUs, and widely-known handle of Boostle.
Nite Owl/Rorschach is the most popular pairing in Watchmen fandom, despite one being overweight and suffering from ED, and the other being ugly and sexually repressed. Oh, fandom.
In-universe example: the main character of Empowered is a slash writer and reader, and there's a thriving Yaoi doujinshi scene slashing her male teammates.
Doctor Doom and Reed Richards have a lot of fandom speculation, although pretty much all their slashfic is either tragic stuff that posits that Reed and Doom were more than just classmates in college before the accident that turned them into arch enemies, or disturbing rapefics revolving around Doom's...er...really, really,really obsessive hatred of Reed. Or both.
Doctor Doom and Loki is quickly coming up a close second to Doom and Reed. Doom's become so obsessed he at one point had a room full of Loki clones and in his fantasy world he had Fem!Loki and Emma Frost chained to his throne, where, in his own words, 'They belonged'.
spider-man/human torch have their own LiveJournal community.
At one point the number of hits on Google for "Sparrabeth", "Willabeth" and "Norrabeth" combined were less than the number of hits for "Sparrington" in Pirates of the Caribbean.
TRON fandom also has slash by the bucket. Pick two characters from the franchise - any two. The discredited sequel and animated series are fair game as well. Pretty men in skintight spandex and very few female characters has something to do with it. A society which likely doesn't have the same taboos would be another factor.
Wreck-It Ralph has a decent amount of slash as well. Okay, there's some Ralph/Felix, but an oddly popular ship is Turbo/Felix (called "80's Boyfriends" by the fandom).
The main slash pairings for the prequels are still Obi-Wan Kenobi/Qui-Gon Jinn and Obi-Wan Kenobi/Anakin Skywalker. Anakin/Palpatine has its fans too.
It continues into the OT with Luke/Han and Luke/Wedge. In the Expanded Universe: Corran and Wedge. Corran and Luke. Corran and Kyp Luke and Kyp. Any combination of the guys Jaina has dated. Expect their wives to be Yaoi Fangirls in any Star Wars slash, a clear example of Author Appeal. On the yuri side of things, Mara/Mirax is surprisingly popular, as is Exile/Traya and F!Revan/Bastila or F!Revan/Juhani and Juhani/Belaya (Juhani's seme-sex attraction is actually in the game itself, and the first same-sex romance BioWare attempted, even if they had to sneak it past the LucasArtsradar system).
Skyfall seems to have added 00Q or 007/Q to the mix.
As the Ice Age series continues to grow, so does the fandom around Diego / Sid.
Also people like to pair up the two Deadpan Snarkers of the series, Manny and Diego.
With the third movie, apparently Diego/Buck (?) has been winning itself some fans. Diego's apparently the LOATS for this series.
On the subject of Buck, Buck/Rudy is a paring that has been slowly but surely appearing.
Since the 2009 Sherlock Holmes movie, there's been movie version Holmes/Watson slash. That existed due to the literature already, but adding Robert Downey Jr. and Jude Law to the mix couldn't have hurt.
It seems that Ritchie realised what a great audience slash fans were, and turned the Ho YayUp to Eleven for the second movie.
Inglourious Basterds fic mainly consists of Slash Fic and Mary Sue fic with a bit of het thrown in occasionally. The Basterds get slashed in every combination possible (for instance, Aldo/Donny, Aldo/Utivich, Donny/Utivich, Utivich/Wicki, Utivich/Omar, Donny/Omar, Donny/Stiglitz, Aldo/Stiglitz, Stiglitz/Wicki, Stiglitz/Hicox, and the list goes on and on and on...).
One of the more disconcerting examples involves Landa raping Utivich and Aldo.
On the other hand, there's a fic where Utivich and Aldo have sex in the forest after the end while Landa is tied to a tree and Forced to Watch.
In an amusing twist, the actors and Tarantino found out about the slash fic. Rather than getting mad, however, they took it in stride. Eli Roth's only objection was that "there's no fuckin' way Donny's a catcher!" And he has a point.
Hot Fuzz. Considering that the writers and actors acknowledged the Ho Yay themselves (including fake makeouts in the bloopers!), and that some of Danny's lines in the movie were originally written for a love interest for Nicholas, who was then cut - but the lines stayed the same - it's not surprising that the fandom, though small, pretty much universally ships Nicholas/Danny. And then there was that time the writers gave it theirWord of God approval, and actually called the movie itself "Nicholas Angel and Danny Butterman slash fiction."
Chris/Dustin and Tyler/Cameron are also pretty popular.
Ryan/Chad is pretty popular in the High School Musical fandom, mostly due to the sexy musical baseball scene in the second movie, which included lyrics such as, "I'll show you how I swing" from Chad. After the game we see them eating hotdogs with each other. To top it all off, they have switched clothes.
Judging from the (Sadly) few Bill & Ted fanfics out there, the most popular pairing seems to be Bill/Ted.
Being possibly one of the most slashed and most talked about duo of all time, Sherlock Holmes and dear Dr. Watson.
Especially baffling because any true student of Conan Doyle knows the realUnresolved Sexual Tension is between Watson and Lestrade.
The most popular Harry Potter slash pairings are Harry/Draco Malfoy, Remus Lupin/Sirius Black (puppy love, slashers often call themselves puppyshippers, thus confusing members of an entirely different fandom), Snape/Harry (talk about Slap-Slap-Kiss) and Snape/Remus Lupin. The Squickiest ones are such as Harry/Voldemort, James/Harry, Draco/Lucius Malfoy, the infamous Fred/George "twincest", Dumbledore/Harry...
And I'd certainly avoid googling the term "Dobby stretches, sir" if you are easily sickened - the Dobby/Hagrid pairing is worse than it sounds.
Luna / Ginny is — or was — probably the most popular Les Yay ship (it was only popular for a short time, as book six made it clear that Ginny would end up with Harry).
Ginny/Hermione is very popular, particularly with both Ginny AND Hermione realizing that their boyfriends at the end of book 7 are not adequate and choosing to leave Harry and Ron for each other.
Also ever popular is Bellatrix/Narcissa or either or both of the two with Andromeda, sometimes even "punishing her" for becoming a blood traitor.
Lily seems to be shipped with some female characters such as Alice, Bellatrix, Narcissa, and even Ginny.
It should be noted that several fic writers slash Harry with Tom Riddle Jr., separating him as a character from Voldemort.
About 90% of Vetinari fics involve him getting with Drumknott or Vimes.
Frodo/Sam in The Lord of the Rings. Some will argue the overtones were there in the novels, though the movies certainly didn't help.
Even the Nostalgia Critic ships FrodoxSam! Or at least agrees with it. Somewhat. Probably for the sake of comedy. (Watch his Harry Potter Book Seven Release video. He asks "Gandalf" about it.)
From the point of view of a person that lived in the 50s, Frodo and Sam were just really, really good friends (and even in those times, there were probably people who found their relationship slightly ambiguous).
Same goes for The Silmarillion, with its overwhelmingly male cast of characters.
Oh, there are definite overtones for Gimli/Legolas in the novel. Such as when Gimli insisted on taking Legolas on a date to the most gorgeous crystal-filled caverns he'd ever seen once the war was over. And don't forget that Gimli decides to spend the rest of his life in the Deathless Lands, being the first dwarf to do so because he became real "friendly" with Legolas, and now gets to spend the rest of his existence with him.
Aziraphale/Crowley of Good Omens. Hardly surprising, considering the canon Ho Yay and the "forbidden love" appeal of an angel and demon loving each other. More surprisingly, fandom portrayal seems to be evenly split between subtle UST that toes the gen/slash line and full-blown slash.
When asked what happened to Aziraphale and Crowley after the events of the book, Neil Gaiman said they moved to the South Downs. See Holmes and Watson, above.
The early stage of GO fandom (before 2005) apparently contained less smut than new Yaoi Fangirls expected, to the point that some complained (though it may have been because they anticipated Harry Potter-esque amounts of slash in a fandom that's just a blip on the radar compared to that one). It wasn't until the GO Exchange and Switchythings LiveJournal communities were created that the porn reached "acceptable" levels.
Narnia, for want of 'human' companions for its main characters, tends to have a decent bit of this in the fanfic sections. Tends to be incest as well, which doesn't really seem a whole lot better than bestiality with perfectly decent, talking animals, but there we go.
Contributors to this include even Neal freaking Gaiman. Don't believe me? Check out The Problem with Susan, from the Fragile Things anthology, if you dare - but be warned, as it goes there. As in the there mentioned above. And I'm not talking about the incest.
Edmund/Lucy is probably one of the most popular pairs, apart from the official Susan/Caspian, especially since the third movie appeared. Most fans blame it on the actors, that look really good together, after they hit their growth spurts. You can see some pictures here.
Even though it has a smaller following then most pairings, Arthur/Ford is surprisingly popular within the fandom (and some of it's not that bad).
Twilight has the infamous Edward/Jacob, the incestous(or not) Edward/Jasper and the almost canon Edward/Carlisle (Carlisle chose Edward as his first companion). It doesn't matter the fact that Edward is a vampire, Jacob is a werewolf and that they cannot even stand each other's smell. And that they hate each other's guts, because they are both obsessed with Mary SueBella.
Don't forget Bella/Alice on the femslash side. There is also the moment in Eclipse when Leah tells Jacob she dreams about kissing Bella, which has sparked quite a bit of femslash.
British boarding school stories, from the late 19th to the mid 20th Centuries. Multiple authors, boys' and girls' schools, but noticeably Horace Vachell ("The Hill"), E.F. Benson ("David Blaize"), and Angela Brazil, featured relationships which either bordered on, or crossed over into, physical affection between (or unrequited physical longing for) same-sex friends. Put whatever interpretation you want on them, but at least one of Benson's characters thought himself a monster who ought to be shot for his feelings towards a younger boy (the book was written at the time of the First World War, so this attitude is unremarkable for the time).
And then there's all the femmeslash based around Enid Blyton's universe (particularly Malory Towers, however the Famous Five have George/Anne but mostly seem to be Julian/Anne het) (although you are advised to avoid the George/Timmy and Chinky/Wishing Chair).
Other ships, such as Niall/Seth, Keenan/Seth, Keenan/Niall, Donia/Seth, and Donia/Aislinn definitely aren't however.
Havemercy lends itself particularly well to slash fiction, considering that the number of female characters with names and personalities can be counted on one hand. Royston/Hal is canon, of course, and Rook/Thom may be the most popular, but there are plenty of others. A good picture of what I mean can be found on the LJ fan comm.
It doesn't help that the series had a built-in slash base... One of the authors is Lady Jaida, well known for the Harry Potter Sirius/Remus epic The Shoebox Project.
Tamora Pierce's Tortall Universe books have quite a few of these, especially for those who frequent the forum Goldenlake. A particularly popular one which has evolved into something of a fandom joke is The Contes And Their Squires. Due to their fanfiction drives - most notably their multi-month SMACKDOWN competition - many slash pairings have become more and more popular in the wider fandom.
A Song of Ice and Fire has a few popular slash pairings, like the canonical Renly/Loras or more subtextual pairings like Theon/Robb, Robb/Jon, or Stannis/Davos. A Dance With Dragons has also opened the floodgates for Jon Connington/Rhaegar Targaryen. Margaery/Sansa is fairly popular on the lady front.
"Les Misérables" has a huge slash fandom, the most notable pairing being Enjolras/Grantaire.
The "classic" - some might say definitive — Slash pairing is Kirk/Spock (from Star Trek: The Original Series). It has been suggested that the term "slash" came from the slash (the "/") between Kirk and Spock. According to The Other Wiki, there was a time in the 70's when the terms "slash" and "K/S" were used interchangeably.
Shouldn't it be Jock? None of the real-life portmanteaus use one person's surname.
Star Trek was the first fandom to write stories detailing an explicitly romantic relationship between two same-sex characters. (As The Ship's Closet points out, the fact that slash emerged during such a homophobic era is quite telling and points to a tremendous amount of subtext. Of course, when you consider that Gene Roddenberry himself invented the Vulcan word t'hy'la, meaning "friend/brother/lover", it becomes less about Subtext and more about Getting Crap Past the Radar.)
TV Guide's September 15, 1967 summarization of the Star Trek episode "Amok Time" with the double-entendre "Mr. Spock succumbs to a powerful mating urge and nearly kills Captain Kirk." may very well have been the original inspiration for this entire, particular, fanfic genre.
The very, very first slash story, Jennifer Guttridge's The Ring of Soshern, has been dated to at least early 1968 and possibly late 1967 (it cannot be any earlier than September 1967 because it mentions pon farr). So, some variant on the TV Guide origin legend could very well be the case. However, Ms. Guttridge was British and wouldn't have been reading TV Guide; also, she'd have had to have this episode described to her because Star Trek didn't air in Great Britain until 1969 and "Amok Time" wasn't shown until November of 1970.
Another highly popular Slash pairing is Garak/Bashir, from Star Trek: Deep Space Nine. This could be because the the actors and writers played up the Ho Yay possibilities, and at least one of the actors is on record as having asked that the relationship be shown in canon, in 1995.
Star Trek: Voyager was fertile ground for this given Captain Janeway's touch-feely body language. - It was said that Janeway only had to give her famous Gooey Look in the vague direction of a bulkhead and there'd be a dozen Janeway/Bulkhead fanfics the next day.
Coupled with the failure of the Powers That Be to join her up with anybody (despite them all being trapped alone in the Delta Quadrant for six years) when they finally did hook up the captain ... it wasn't with a crewmember, but with a hologram. ... Very unsatisfying.
C'mon, if you can't see the love in Admiral Janeway's eyes at "Endgame" when she sees Seven, you must be blind. Also, it only takes Seven's name mention to crack the 'self-righteousness' of the Captain. To the hell with the Temporal Prime Directive!
The touchy-feely, "we love each other like family" vibes of the show also make "Voyager" a goldmine for fangirls searching male Ho Yay subtext. Tom Paris's oddly close friendship with Harry Kim and tensions with Chakotay were probably meant to seem "brotherly," but try telling that to the fanfic writers....
Stiles and Derek (aka "Sterek") on Teen Wolf have emerged as an incredibly fast-growing Fan-Preferred Couple. The pairing emerged as the victor of a multi-week series of polling to determine fan favorite slash ships on After Elton, beating out numerous other pairings, most of which are listed on this page. Internet buzz for the tourney was so great that cast members from the various shows actually weighed in via Twitter and other media to support the favored ships from their respective shows.
Babylon 5 has one, too. Since the show had Subtext between Ivanova and Talia, they would be the most obvious pairing.
Ivanova/Talia is pretty much canonical. There was Ivanova's admission to Delenn during the rebirth ceremony that she thought she loved Talia. Also, it's very strongly implied that Ivanova and Talia shared a bed in the episode "Divided Loyalties," though whether they were just sleeping or if something else happened is never stated. Unfortunately for the shippers, it's highly unlikely that anything happened, because if it had, Talia's evil personality would probably have brought it up to taunt Ivanova during her rant at the end of the episode.
An oddly popular one is Marcus/Neroon. The two characters only interacted in precisely one episode, in which they attempted to duel to the death. Yeah, I don't get it either.
Londo/G'Kar has a modest but devoted fan base.
Farscape also has a sizable slash fandom. One of the biggest pairings was John/D'argo, which actually got a Shout-Out during a body-switching episode (I think D'Argo's body was inhabited by Chiana at the time, I don't know who was in John's body). Other pairings included: Zhaan/Chiana, Aeryn/Other Female; even John/Crais for the Foe Yay fan. Also, stories where D'Argo actually went off with Staanz (The Zenetan Pirate, not the Ghostbusters guy).
Stargate SG-1 fanfic has lots: Sam/Janet, Jack/Daniel, Sam/Vala, Jack/Teal'c, Teal'c/Daniel, Hammond/Jack, Hammond/Daniel, Hammond/Teal'c, even Hammond/Thor, Daniel/Entire-Village-Full-Of-Funny-Looking-Mute-Mushroom-Men, Big-Ugly-Alien-Bug/Jack, and many more - some even too ludicrous to mention - believe it or not.
Stargate Atlantis has a lot too: McKay/Sheppard is predominant, but there's plenty of Ronon/Sheppard, McKay/Zelenka, Teyla/Weir, and the list goes on. The show has not been shy about providing plenty of slashfic fodder.
The Doctor/The Master. This is almost explicit with the newest version. See also: The Doctor / Any Male Companion (especially Adric, trust me), with Captain Jack and Jamie being the favourites. The fact that the Doctor has had more female than male companions, however, means that the slashers have to take what they can get here
At this point, if you judge by fanfic, Jack's done with the Doctor and is now banging anyone in any crossover that he can.
Romana / Leela has also become popular due to the Gallifrey audio dramas.
House/Wilson slash is easily one of the most popular pairings for House fanfic. While the subtext in the show is often for humourous effect and frequently Lampshaded, it might be intentional, too: Katie Jacobs, executive producer, once stated that there are equal chances of House ending up with Cuddy, Cameron, or Wilson.
Heroes is full of slash. Here's a game to try at home. Print out the names of all of the male characters, no matter how obscure, from Heroes put them all on the wall and throw two darts at it. Using this method, try to find a pair somebody doesn't ship.
Unsurprisingly a certain indestructible cheerleader also stars in a lot of Heroes fanfic - Claire/Peter, Claire/Elle, Claire/Gretchen, Claire/Etc... And Claire/Gretchen actually became canon femmeslash right near the end of season four. Due to being the most prominent female character, most of the femmeslash in the Heroes fandom features Claire.
Sylar and Peter tend to show up in plenty of slash fics. It helps that they are both magical and can be shipped with anyone. Sylar and Peter have a ton of slashy subtext with each other that was ramped up to 11 in season four and they slash with other male characters. Sylar/Mohinder was the most popular Sylar ship for a while until the amount of screentime Sylar and Mohinder had together was reduced. In addition, Petrellicest (Nathan/Peter) is quite popular.
Before he was killed off Adam/Hiro and Adam/Peter were fairly popular pairings. And hey, there's always AU fic.
And on the female side, there's also River/Kaylee and Inara/Kaylee.
Mal/Simon for the win!
Jon/Stephen on The Daily Show. The amount of deliberate Ho Yay in the source material has not lessened the number of fics on this pairing, but it has encouraged fics on just about every other pairing possible.
British comedian and substitute host John Oliver talks about discovering TDS slash when he sent a link to from a friend in his stand-up:
"These were beautifully written stories, I don't want to give you the wrong impression! It was not just base pornography! There was a lot of time and lyrical language spent in describing the romanticism of each situation. A story might begin: 'Softed fall, the snow outside a ski lodge in Vermont, mounting up inch upon snowy inch on the wooden window sill. Lit from within by the glow of the roaring fire. Around the fire did sit Jon Stewart and Stephen Colbert, flushed from a long day skiing, toasting the marshmallows on the dancing flames, that surely they would enjoy as s'mores later that night. In walked the butler...' (sarcastically) Oh, who could that be I wonder? That is basically racist! This is just ignorance, is what it is. It's just ignorance! (mockingly)"Can I 'elp you two with anything?" Said the butler exactly how they all speak. "Anything I can do for you? Pish-posh, hufflepuffle, flip-flop!" "No thank you Mr.butler," said Stephen Colbert "But you can help me with this":(makes unzipping fly motion) Zip! Thud! and I'm going to stop there, bcause you don't need to carry around in my head, what I carry around in mine! The point is who would have thought that technology had evolved to the point where I would find myself alone in my office at work, shouting out loud at my own computer screen screaming 'WHEN DO I AT LEAST HAVE A GO?!!' Wait, what?'"
Sam/Gene on Life on Mars. The amount of slash fiction on this pairing is unbelievable with there being more than 1000 slash fics on this pairing alone on the "lifein1973" livejournal page, no doubt stemming up from the close physical contact Sam and Gene constantly display on the show. Chris/Ray is also a popular pairing.
Just to further prove that there's porn of EVERYTHING somewhere on the net, there is apparently Slash Fiction of British improvisation Panel ShowMock the Week involving Frankie Boyle and Hugh Dennis. Boyle brings it up on the show as well as giving a quick description of Slash Fiction in general.
Frankie: Hugh has to be careful because this week I've discovered - I don't know if you know what slash fiction is? But it's basically gay fiction on the internet where they have people like, you know, Captain Kirk and Spock shagging each other. And there's one of me and Hugh. Hugh: * Celebrates* Frankie: I don't know why you're doing that, Hugh, because you're the receiver. Hugh: I'm just trying to make it easier for you. Frankie:And the most offensive part of it is when they describe my pubes as being ginger.
There is Ryan/Colin slashfic from the American Whose Line Is It Anyway?. Might I mention that they are both married, and not to each other? Though, the Ho Yay certainly doesn't help...
Slash writers of The X-Files fan fiction like various combos of Mulder, Skinner, and Krycek (including throwing all three together, with Doggett occasionally getting shuffled into the mix somewhere). There's also a not-insignificant amount of Scully/Reyes, and even some slashing of the Lone Gunmen in various combinations.
Merlin. The Arthur/Merlin slashers here make up something like 85% of the show's overall fanbase, and in fairness, it's not as if they haven't been provided with fertile soil on which to build. Unconvinced? Start out at the "sleeptalking" scene in The Poisoned Chalice, add the touchy-feely Serious Emotional Business bit when they sleep next to each other in Moment of Truth, plus the armor-fastening scene from the same episode, take a right at the almost-hug in Beauty and the Beast - Part 2, a left at the random noogie in The Lady of the Lake, drive straight down the middle of every scene they have together in The Last Dragonlord and you're there...
The episode Lancelot is so slashy that even the TV Guide summaries pointed it out. Lancelot/Merlin and /Lancelot/Arthur are fairly popular pairings. There's also Gaius/Uther, Merlin/Will, Merlin/Edwin, and, on the female side of things, Gwen/Morgana and Morgana/Morgause.
Sugar magazine's summary of the show mentions a bromance between Merlin and Arthur.
Buffy the Vampire Slayer fanfic has plenty of slash, but has the added complication of a canonical lesbian couple (Willow/Tara). Other popular pairings include Willow/Buffy (based on the characters being extremely close), Buffy/Faith (based on the Slayer bond and significant subtext in season 3), and Spike/Angel (based on both actors being extremely hot).
Spike/Angel happened at least once. As Whedon put it, they were horny vampires who happened to be around each other a lot. These things happen. ("They're open-minded guys!")
Over on Angel we continue with the Spike/Angel subtext, add a dash of Wes/Gunn, and a whole heap of Angel/Lindsey. Why is Christian Kane always slashed?
Spike/Xander is very popular. There is also a small following for Angel/Xander, Oz/Xander, and Lance/Xander. The writers deliberately put in Ho Yay for Spike and Xander, though, and Joss originally wasn't sure if he would make Xander or Willow gay.
Really, Spike/anyone male, or Angelus/anyone male.
There is Scrubs slashfic out there too. JD/Cox is the most common pairing. And the most mentally scarring.
I guess JD/Turk would be too easy. It seems like the show wants fans to make slash fic about them. They take their bromance very seriously.
There's surprisingly few slash fics for those two, actually. Turk and Carla rarely get split up.
The show has also given enough material for JD/Janitor and JD/Keith. Both Slap-Slap-Kiss.
For some odd reason, in the result-of-quarreling absence of Jeeves, Bertie is often slashed (and threesomed with Jeeves in some fics) with his Long Island poet friend Rocky Todd, who only makes two appearances, instead of his much-recurring friend Bingo Little.
One of the executive producers of Leverage, when asked if it bothered him that more people wrote Eliot/Parker than Hardison/Parker (one of the show's canon pairings), started his response by saying something along the lines of: "Let's be honest, more people are writing Nate/Eliot."
As seen in the quote at the top of the page, Supernatural has so much slash, apparently, that it has even managed to creep into the universe in which the story takes place (thanks to a Prophet who wrote books about Sam and Dean without knowing they actually existed). The opener for season five even involved a slash fangirl as a minor character in the form of Becky, webmistress of morethanbrothers.com.
Examples are: Sam/Dean, Dean/Castiel, Sam/Gabriel, Castiel/Gabriel, Lucifer/Michael, Lucifer/Sam, Lucifer/Castiel, John/Bobby, Crowley/Bobby... Pick two random characters of the same sex and, chances are there's fic for it.
Misha Collins once said in a Q&A that apparently, there's also Dean/Castiel/pie... But Misha sometimes says the darndest things.
Tony Dinozzo seems to get this alot- he gets paired up with Gibbs or McGee or Palmer almost as much as his canon (and fanon) Het pairings.
There are also fics pairing Ziva with Abby and, in alternate universe fics, Kaitlin Todd, someone Ziva never even met.
Gibbs/Ducky is also a popular pairing.
Degrassi: The Next Generation has several popular slash fic pairings.
Peter/Riley became popular after Riley kissed Peter. Many fans insist that Peter is bisexual and truly wants to be with Riley.
Spinner/Marco, Spinner/Jay, and Sean/Jay has always been popular.
Ashley/Ellie, Alex/Ellie, Manny/Darcy, Manny/Paige, and to a lesser extent Ellie/Paige have been popular for a long time especially since Ellie's Fanservice kiss with Paige.
Holly J/Jane has had a following for quite some time.
Fiona/Holly J started to get some fans during season 9 and exploded in popularity with the beginning of season 10.
Criminal Minds has Morgan/Reid... and Reid/everyone. Why, you're such a little slut, Reid.
The Man from U.N.C.L.E. has Illya Kuryakin/Napoleon Solo, aka the other K/S. Star Trek fanficcers sometimes pair up Shatner's and Nimoy's characters from The Project Strigas Affair, the episode they were both in, even though the characters barely meet.
Starsky & Hutch has reams pairing up the title characters. Not surprising, especially with all the touching, hugging, and gazing into each other's eyes on the show.
A lot of the slash is split between two couples: Jason and Tommy and Bridge and Sky. David Yost, who played Billy, coming out of the closet has added to the slash fuel.
For girls, one of the most popular pairings is Ashley/Karone. This can be fueled by the fact that Ashley seems to be very touchy around Karone.
The Sentinel overwhelmingly pairs Jim/Blair with daubs of Jim/Simon and Blair/Simon and cases of Jim/Blair/Simon. Richard Burgi (Jim) and Garett Maggart (Blair) sometimes played up the Jim/Blair in out takes, notably in the campfire kiss tape.
Due South has Fraser/Ray V and Fraser/Ray K; sometimes Fraser/Ray/Ray or Ray/Ray. Fem Slash sometimes veers into Maggie MacKenzie/Margaret Thatcher.
If you skim quickly over a selection of Law & Order: Special Victims Unit fic, two things will become clear. First, that the vast majority of the fans ship either Elliot/Olivia or Alex/Olivia. Second, that Alex/Olivia is huge.
Being as its four main characters are all women, Women's Murder Club tends to generate a fair bit of femslash. Lindsay / Cindy and Jill / Cindy seem to be popular pairings.
You will lose any bet to find a Rizzoli & Isles fic that does not consist of solely those women together romantically; once again Angie Harmon makes it very easy to slash her characters despite being a real-life Republican.
A real-life Republican who supports gay rights.
Within minutes of its first broadcast Sherlock generated a load of Sherlock/John Slash fics. Most Slashed characters of all time indeed.
The show itself lampshade/parodies the slash-magnetism of Sherlock, as most people assume that Sherlock and John are a couple. Sherlock doesn't care, but John gets annoyed. Later, he even comments whenever they do something that will make people talk even more.
Not to mention the exceedingly slash-friendly Granada TV series.
This even creeps in-universe in the third season, where a member of The Empty Hearse is a Sherlock/Moriarty fan.
Glee: Kurt and Puck are paired with literally everyone, male and female. In the first season, Mike/Matt was popular, although it's faded into the background a bit since Matt was Put on a Bus. Slash pairings involving Sam have become pretty popular, something that can be attributed to early speculation that he would be gay, and his frequentShirtless Scenes (usually with Finn). On the yuri front, Rachel/Quinn is enormously popular while, likely in response to popular demand, Brittany/Santana became canon. And Quinn/Santana entered the ranks in Season 4 after the two characters had a one-night stand.
The West Wing, usually involving Josh, either with Sam or Toby. Any reluctance to include President Bartlet in this sort of thing, out of respect for the office, is probably a lot less likely following the real-life exploits of Bill Clinton.
The A-Team: The most popular slash pairing appears to be Face and Murdock, followed by Hannibal and Face, and then very rarely is BA slashed with Murdock.
In Warehouse 13 fanfic the most shipped couple hands down is Myka/HG this is due to the very deliberate subtext by the actors and writters.
Subtext? are you kidding they look like they want to jump each other whenever their in the same room.
Lost Girls most dominant pairing is Bo/Lauren thought there is quite a bit of Kenzi/Dyson slashing.
Once Upon a Time is full of Emma/Regina which is awkward considering Regina is Emma's step-grandmother. Oh, and they hate each others' guts. Of course, it would solve the custody battle over their son (Emma's the birth mom, Regina's the adoptive mom) in a non-lethal way.
Grimm has spawned stories with Nick/Monroe. Nick/Renard is also extremely popular.
Pick any two male characters from Highlander, and you will find slash fics for them. Examples include Duncan/Methos, Duncan/Joe, Methos/Joe, Methos/Richie, Joe/Richie, Methos/Kronos... the list is endless. For females, Amanda and Rebecca seem popular, but other pairings exist.
Steve and Danny on Hawaii Five-0 are a popular pairing with slash fic writers, especially due to their penchant for Man Hugging, willingness to die together and recent tendency to openly say "I love you" to each other. That Steve is also an Honorary Uncle to Danny's daughter Grace results in numerous scenes where the two of them look like gay parents.
Expect this to be the case when it comes to fic written about just about any band consisting of more than one male member (or, if you're into yuri...). The fangirl writers of the My Chemical Romance fanbase, for example, seem to really love this trope. A sizable portion of what's out there requires Brain Bleach. Course, when you consider how the live shows tend to get, it's kind of hard to blame them.
Almost every single fic written for the Bandom Big Bang (a yearly fanfiction challenge on Livejournal) is slash or femmeslash, entirely despite the fact that many of the subjects are already in heterosexual relationships of various commitment levels. The main bands slashed are My Chemical Romance, Fall Out Boy, and Panic! at the Disco. A surprising amount of it is shockingly decent.
Proving that the internet does indeed have everything, there exists slash... involving Slash.
Guns N' Roses fandom is absolutely full of it, most of it being Izzy Stradlin/Axl Rose, Duff McKagan/Slash, or Slash/Axl.
X Japan attracted a lot of this for a while. The situation has changed somewhat now in that while the band is still high in regard to Ho Yay and Heterosexual Life-Partners and more, the slash writers abandoned the fandom, so slash for the band for a while was pretty much abandoned fic and old fic.
It is somewhat of a Justified Trope there, as the band from 1987-1996 had at least three members who are bisexual and one that's possibly Ambiguously Bi or Ambiguously Gay, two of the bisexual members seemed to have feelings for each other at the very least, and they were pretty much the band known for being the Trope Maker for Ho Yay in Visual Kei. While all the couples in the slash fic aren't canon by any means (though one likely was), a lot of what drove it to exist was.
Adam Lambert. He is a fandom unto himself. Lets see, we've got him with Kris Allen, Brad Bell, Tommy Joe Ratliff, Drake Labry, Sauli Kosikinen, and those are just the common ones.
Ironically there is quite a fandom for a straight involving Adam and Allison Iraheta.
Buck Tick was another Visual Kei band that played into the image for fanservice, lyricists that wrote lots of homoerotic lyrics (Suzumebachi,Jonathan Jet-Coaster among others) and may have one bisexual member (though he seems to be equal-preference for women and men). Like X Japan above, though, it's an old enough band to have suffered writer attrition - most fics are old and most active writers are elsewhere, though a few remain. Due to a photoshoot, also, one of the most popular pairings is a crossover with X Japan slash - Atsushi of Buck Tick / Yoshiki of X Japan.
There's quite a lot of Emilie Autumn/Veronica Varlow fics out there.(for the record, their stage characters are pretty much a couple, but while Emilie is actually a panromantic asexual, Veronica is straight and married, only playing up the Les Yay when she's performing) There's also Emilie/Courtney Love and Captain Maggots/Contessa.
The Beatles have a disturbingly large slash community with Lennon/McCartney being the most popular for certain reasonsnote Hey, you've got to hide your love away..
In a case of a band that is its own Slash Fic, there is the neo Visual Kei band Adams, whose band concept and name is about being two male lovers.
In the Metallica and Megadeth fandoms, Dave Mustaine and James Hetfield are a very famous pairing. In just the fandoms alone, Dave Mustaine and David Ellefson are common for Megadeth while James Hetfield and Kirk Hammett are common for Metallica.
That many fans of Wicked are also "Gelphie" supporters shouldn't surprise you, seeing as the musical (and the novel to a lesser extent) invests so much in Glinda and Elphaba's friendship and closeness. What may surprise you is that there's also a subgroup of fans who are huge "Chenzel" supporters - that is, fans who like to romantically pair Kristen Chenoweth and Idina Menzel, the actresses who originally portrayed those characters on Broadway. Despite the fact that both women are heterosexual and Idina Menzel has been happily married to actor Taye Diggs since they met on Rent.
Cats. It's usually Rum Tum Tugger/Mr Mistofelees, but Munkustrap usually falls in there somewhere. Never mind the fact that Tugger is shown flirting with half the girls in the show. Ah, what the heck, it's enjoyable anyway.
Mark/Roger from Rent. Collins/Benny and Angel/Mark as well, strangely enough. But the Mark/Roger practically dominates the fanfiction.
Mac/PC. No seriously. Hopefully based on the commercials that had the two computer lines personified as actual humans...
The writers of Phoenix Wright: Ace Attorney and sequels left themselves wide open for this one. Phoenix/Edgeworth is considered virtually canon by many fans, but there's also random dart-throwing going on here too.
Franziska/Adrian seems also to be considered virtually canon.
We're not even going to get into Mia/Lana...
Now Apollo Justice brings us Klavier/Apollo.
Well, considering that the creator has said that Edgeworth doesn't like girls, it sort of is canon — at least, from one half of the equation.
From the other half too. Phoenix has been confirmed by Wordof God to find Edgeworth 'pretty hot'.
Thanks to Sonic the Hedgehog having a heaping helping of cute male characters and a shortage of females, there's quite a lot of it with Sonadow being probably the most popular slash pairing. Sonurge is now on the rise with Archie's creation of a badass Evil Sonic in a nifty leather jacket. Sontails and Knuxails are pretty prevalent, too.
Too many in Metal Gear to count, Snake/Otacon and Big Boss/Ocelot being the most popular, but since MGS4 Vamp/Raiden has gained a disturbing amount of popularity.
The bara on MGS has left many possibilities. We could have a whole section about MGS bara.
X/Zero from Mega Man X. And there's still plenty more where that came from, from X/Zero/Axl to Red/Axl, along with a plethora of Rule 34 pairings. Sigma/Zero and Sigma/X are inescapable.
X/Zero is practically canon as of Mega Man X6, after that scene in X6 where X asks Zero to "hold hands...and never let anyone sever [them] again".
There's even the traumatizing (spoiler cut for brain salvage) Dr. Wily/Dr. Light, and the slightly less brainbreaking Bass/Mega Man and Proto Man/Mega Man. Not to mention all the Robot Masters, which are all male, save one. But what's unforgiveable is that all the Bass/Protoman around is sickeningly sweet or a collection of old boring rape cliches.
Try to find a pairing between Robot Masters that isn't shipped. I dare you. More random dart-throwing! It gets even worse when you add in the Stardroids.
Team Fortress 2 has 18 primary male characters, numerous male secondary characters, and a single female announcer. There are no unique pairings left.
Well, in game, at least. In the supplementary materials, there's the announcer's assistant, Scout, Demoman, Sniper, and Heavy's moms, Heavy's three sisters, and Maggie/Margaret/Mags (an Old Flame of Saxton Hale). And the Medic may or or may not have a wife, if you believe the word of a drunken, taunting Scotsman. There's also Gray Mann's daughter, but she's excluded on the basis of being a child.
Go to the Kingdom Hearts section of Fanfiction.Net. It is INFAMOUS for its slash levels...
If you search the term "yaoi" then it comes up with 3,800 fics with the word just in the summary. Note that Tetsuya Nomura, the creator, has an official stance of No Hugging, No Kissing. This even stems to the canonical Disney relationships, where the most romance ever seen is Belle and Beast dancing together, or Simba and Nala leaning their heads against each other.
Mass Effect has Female Shepard/Liara and Female Shepard/Kelly. Ashley, Thane and Tali were originally romance options for both genders, but this was Dummied Out. Male Shepard/Kaidan was Dummied Out in the first game, then brought back for the third game due to fan demand. And those are just the ones that are actually in game: pretty much everyone has been shipped with everyone else by this point. The fanfiction page has Shepard/Mordin, Shepard/Joker, and Miranda/Jack, just as an example. Hilariously, Shepard can suggest to Jack and Miranda that they hook up in Citadel. They were notamused.
Final Fantasy VII has a lot of slash pairings, mainly anything that moves with Cloud. Sephiroth/Cloud, Zack/Cloud, Vincent/Cloud, Barett/Cloud, Reed/Cloud, Reno/Cloud, Rufus/Cloud, Reno/Rude, Reno/Rufus, Reno/Tseng, Tseng/Rufus, Vincent/Cid, Zack/Sephiroth.
This doesn't have to stop at twos. Sephiroth/Zack/Cloud is very popular, too. I've also seen Rufus/Tseng/Reno.
For femmeslash you Tifa/Aeris,
With the new movie you have Cloud/Kadaj, Kadaj/Rufus, Yazoo/Loz, and Kadaj/Yazoo/Loz.
Tossing Crisis Core in the mix gives us Zack/Angeal, Angeal/Genesis, Zack/Genesis, and Genesis and/or Angeal with Sephiroth.
The most popular slash pairing for Final Fantasy VIII is arguably Seifer/Squall. You also find Seifer/Zell, Squall/Zell, Squall/Irvine, Seifer/Raijin.
Femmeslash gives you Quistis/Selphie, Quistis/Rinoa, Quistis/Fujin, and Selphie/Rinoa.
Final Fantasy X had especially homo-erotic imagery, and thus created pairings of pretty much any combination of main male characters. Most common were Tidus/Wakka, Tidus/Auron, Tidus/Kimahri, Kimahri/Wakka, Kimahri/Auron, Tidus/Kihmari/Auron. Non-main characters also got drawn into this, specifically with Auron/Jecht/Braska (Which is canon as Heterosexual Life-Partners), Tidus/Jecht, and Wakka/Letty (One of the Besaid Aurochs Blitzball players, which Wakka was originally the captain of). On the girls side we have Rikku/Yuna.
The Legend of Zelda offers up Link/Ganon, Link/Shad, Link/Dark Link and...well, Link/whatever the hell character of any (-coughdementedcough-) author's choosing.
Half-Life has parodies with Gordon/G-Man, but then you get into the serious stuff. Fanfiction.net gladly offers up Barney/Gordon and Magnusson/Gordon, among... other things.
Lampshaded in Disgaea 4 - creating an Android will reveal that there are Valvatorez/Fenrich slashfic writers in the Netherworld.
It doesn't end there: Altair/Malik from the first game (there's not much interaction between Altair and any other character besides Al Mualim, so there's plenty of room for interpretation) and Desmond/Shaun from the second game onwards (he's the only guy Desmond's ever really around, and his snarkiness brings back memories of Malik). And that's not even getting into all the time travel/reality bending fics out there...
Invoked in Oglaf's 2 Arabian Nights. Sheherazade tells the sultan an erotic tale of a princess and her lover, but the comic shows that the story inside her head has a minor twist.
Homestar Runner Strong Bad Email #188, fan club, has both Strong Sad writing Strong Bad Fan Fic and Strong Bad writing Strong Sad Fan Fiction (because he has plenty of time to say both syllables). Both of them include a hastily interrupted scene where they get slashed with Homestar Runner, Strong Sad having Strong Bad put on a bonnet and give Homestar a deep tissue massage, Strong Bad just having Homestar walk in "naked as a jaybird" and suggestively ask Strong Sad for Twizzlers. Naturally, you can't type in "Homestar Runner fanfic" on Google without some slash showing up. Just don't try it on deviantART, unless you enjoy your eyes melting out of your skull.
In-universe fans of Survival of the Fittest are apparently fond of these types of fanfic (heck, this kind of fanfic in general. then again... In fact, it was the reading of a particularly disturbing Uriel Hunter/Jacob Starr fic (accidentally broadcast on the PA system to the students on the island) that got three of Danya's terrorists thrown into the game themselves.
Red vs. Blue has a pretty large slash fandom, with Grif/Simmons being the most popular pairing by far, and Church being the LOATS. But essentially everyone has been paired with everyone else.
Word of God has indicated that Grif/Simmons may actually be canon.
That Guy with the Glasses. According to the archives, seven out of the ten most popular pairings are slash and there's almost twice as much slash stories than het.
In Demo Reel, Donnie DuPre admits that he always wanted people to make a slash fic of him. Needless to say, this is Tempting Fate. Especially given that his actor is notorious for starring in slashfics.
Batman Beyond Since the only male that the star Batman Terry McGinnis is seen with is Bruce Wayne, Original Batman, no surprise they are favourite amongst fans. They were the top pairing, due to the romance of seeing as they're BOTH Batman - or at least until it was revealed that Bruce is actual Terry's dad. Doesn't stop fans of course, even when it's not an AU where they're nonrelated. And surprisingly, Terry/Damian has become a fave in the Fandom, despite being a crossover and having the above problem at the same time!
Transformers fandom has been rife with Megatron/Starscream (often portrayed as abusive or repressed) pretty much since the beginning. The Enemy Mine nature of Megatron and Optimus Prime's relationship also lends itself to slash.
Then Transformers Animated came along and now you'll be hard pressed to find a fic featuring both Prowl and Lockdown in the same scene that isn't slash.
And G1 Jazz/Prowl is practically fanon.
And it's carried over into Prowl and Jazz in Transformers Animated. What is it about ninja robot samurai motorbikes?
Starscream is definitely the Launcher of a Thousand Ships, though. You'd be hard pressed to find one mech, Autobot or Decepticon he hasn't been paired with at least once.
Practically any two characters in Kim Possible, even key villain Shego with Ron's naked mole rat Rufus, but most of all Kim/Shego, which has generated enough writing to develop its own cliches, parodied in this fic.
Note that Craig and Tweek interact only in one episode and they are forced to by their classmates.
And that's not even the most egregious example! The characters The Mole and Gregory are frequently paired in the fandom, even though each of them only appears in The Movie, they don't get all that much screen time, and they never even meet. Yet the amount of Mole/Gregory fanfic and fan art is staggering compared to gen fic, het fic, or even something plausibly gay like Cartman/Butters.
Actually, Tweek is shown hanging out with Craig's gang in some later episodes, implying that they eventually became friends, so it sorta kinda makes sense. However, in the only episode where Damian actually has lines (talk about an Ensemble Dark Horse!), he gains the other boys' respect by setting Pip on fire.
Surprising thing number 1 about the shipping in Invader ZIM is the fact that there IS shipping at all. Surprising thing number 2 is just how truly horrible some of the pairings are. The most prominent slash-pairing is ZADR (ZIM/Dib), but it's another one of those shows where people write character names on dartboards and pick their ships that way. (There's ZIM/Dib, ZIM/GIR hell, GIR gets paired with practically everyone, TAK/Gaz... The list goes on. And on. And on. And on.
Dib/Gaz. Actually, it is implied at one point that Membrane created Dib, so it is highly possible that he created Gaz, too. That makes them a not-so-edgy pair.
Just look around Daria fandom, and you'll find some... interesting slashfic ('Ragged Denim') and saffic ('Night of the Storm', The Winters Of Those Gone Before'). Take brain bleach along for the ride. You have been warned.
Ed, Edd n Eddy's fandom is made out of yaoi. The most popular pairings being Eddy/Edd, Rolf/Kevin, Ed/Edd, Kevin/Edd and Kevin/Eddy.
The Teen Titans fandom has a huge amount of slash - the most controversial probably being Slade/Robin (and with Ron Perlman's voice purring Slade's lines it's not too hard to twist "Oh no Robin, it's about you. It's always been about you." and "From now on I'd like you to call me Master."), whose fanbase is is both extremely loyal and enjoys watching the other characters squirm. Slade is obvious the dominant in this relationship. Other pairings are Raven/Starfire, Raven/Terra, Red X/Robin, Red X/Robin/Slade, Slade/Red X, Speedy/Red X, Speedy/Robin, the occasional Beast Boy/Robin, Starfire/Blackfire, Starfire/Terra, Raven/Jinx, and so on.
Because Danny Phantom is one of those franchise where almost everyone is paired up to whoever, slash inevitably found its way in. Vlad/Danny may be the most prominent one.
Static Shock has lots of options for the slash, though Hotgear tends to be the most explicit, with Virgil/Richie being mostly fluff, and Frieda/Daisy being a vaguely-mentioned "tie up the loose ends" pairing.
Helps that we have Word of Gay about Richie, and even before that his counterpart in the original comics, Rick, was canonically gay.
Good luck finding a romance fic of Bender that doesn't involve Fry for the Futurama fandom. It's quite surprising, considering the Casanova that Bender is in the series. Bender/Calculon and Bender/Beelzebot are also quite popular, but in the minority compared to the Fender fics.
Avatar: The Last Airbender : Chances are, if Zuko and Jet are listed as the main characters of a story, it's a slash fic. Sokka/Zuko and Zuko/Aang are also pretty popular. Zuko being the fandom's male Launcher of a Thousand Ships (with Katara as the female), he naturally gets paired up with every character with whom he has any screen time, male or female. There are a fair number of Katara/Toph fics too, and some people even ship Suki/Toph or Suki/Katara, though these are rarer.
The Legendof Korra: Everyone gets shipped with everyone, but the lead protagonist Korra mostly slashes with Asami and sometimes Lin Beifong. Most of the male/male slash pairings involve Tahno and he's usually paired up with either Mako or Bolin. Tahno is also sometimes paired with his teammates Ming and Shaozu at the same time. Oh, and occasionally with Amon or Tarrlok. Tahno is a slash magnet. The ship Amon/Lieutenant is also quite popular. The moment promotional posters showed Bolin and Mako...The ship still persists despite the knowledge that they're brothers.
In the Young Justice yj anon meme (found here) contains a lot of Kid Flash/Robin and Kid Flash/Red Arrow fics. Dueling for popularity is Robin/Superboy and Superboy/Aqualad. Artemis and M'gann get shipped, too, though more often with Kid Flash and Superboy than with one another. Conversation threads have revealed that a disproportionate number of active Anons are gay, which may or may not be significant contributing factor.
There's also Impulse and Blue Beetle in season two, since nearly all their screen time was of them together.
My Little Pony: Friendship Is Magic is practically made of this, but since the vast majority of the cast is made up of females, it was unavoidable. When the fansite Equestria Daily encountered the exception, they said: "Straight Dash shipping? Is that even allowed?" This doesn't stop fic writers from pairing up the guys. Just look at Big Mac/Caramel... and arguably, Soarin'/Braeburn.
While slash makes up the majority of MLP shipping stories, hetro ships have become more common as of late. Ships such as SoarinDash and FlutterMac have become a norm.
In Adventure Time Princess Bubblegum and Marceline are one of the most popular pairings in the fandom, and it doesn't stop there it extends to their gender flip counter parts Prince Gumball and Marshall Lee.