#I guess I cheated by not going with the rarest which would only include fics for which there is one fic and that's mine

[fallloverfic]

I went overboard (and kinda cheated cause some of these were just a lot smaller to nonexistent when I started posting for them, but are definitely not now), so with the caveat this is only going by Archive of Our Own stats (and also thank you to all the amazing tag wranglers who have wrangled tags that have been the only fic in that pairing/fandom for ages, small fandom authors love you so much):

Blind Men has 15 fics total, mine is the most recent (over a year after posting), and it is the fifth Hunter/Keegan work.

Captain Laserhawk: A Blood Dragon REMIX had 5 fics before I posted the first Alex Taylor/Dolph Laserhawk fic. There are now 213 fics total and 21 Alex/Dolph fics.

It's hard to tell with this fandom because of active fandoms, backdating, and crossovers, but I posted the second fic for Castlevania: Nocturne and Mizrak/Olrox (I know because I went immediately to the tag after watching and I checked it before and after posting mine). There are now 216 fics in the fandom tag and 86 for the pairing. I also posted the second fic for Alucard/Olrox (it's been shifted out of order because another fic either backdated or added the pairing, but one reason I finally put mine up was because the only fic for the pairing at the time was one solely based on the games that predated the show by 8 years). There are now 6 fics for the pairing. I posted the third of the now 12 Olrox/Richter fics.

I created the Dorus/Styxx pairing for the Dark-Hunter Series. I still have the only fic. Dorus isn't an original character (he's a minor acquaintance in the book who meets Styxx twice), but I almost completely retconned his backstory and personality.

I started and was the entirety of the Dear Monster tag for some time (I wrote 3, there are now 4, with one published almost a year after my last fic), and I also published the only Faeryn/Allen fic.

I posted 1 of the 26 Rouxls Kaard/Mettaton fics for Deltarune/Undertale.

I posted the only Ameridan/Kordillus Drakon I fic from Dragon Age: Inquisition. I published the first Lacklon/Roland fic for Dragon Age: Absolution. There are now 19 fics. As I recall it was only like the third or fourth fic at most in the fandom tag at the time, but this is another fandom that's hard to track due to active fandoms, backdating, and crossovers.

Element of Fire has 6 fics. Mine is the most recent and I posted the only Roland Fontainon/Gideon fic. And Roland Fontainon/Falaise, but I don't fully consider that the fic focus so. I think it's also the only one that even includes Roland.

I posted 1 of the 38 Augus Each Uisge/Gwyn ap Nudd fics for Fae Tales - not_poignant. That's 1 out of 15 if you only count fanworks, since all the canon and official AUs are included in the tag. I published both the 2 fanfics for Eran Iliakambar/Mosk Manytrees (the other 4 works are all canon and an official AU). I published the only fanwork for Anika/Terho (the other fic is a canon extra).

I created the crossover pairing Wing/Murata Ugetsu for Hunter X Hunter and Given and have the only fic for it.

I posted the only tagged Clark Kent/Lewis Lane fic for My Adventures with Superman. But I can't believe there isn't something else out there for a character who's technically existed since 1980. There may be one in German and another in English that's tagged for Louis Lane, the 1980 character(s), but they both predate My Adventures with Superman by some years.

I posted 1 of the 11 fics for Brad Boimler/Jack Ransom for Star Trek: Lower Decks.

I posted the most recent 2 of the 4 Van Fanel/Allen Schezar fics for Escaflowne.

I posted the only Lisava Ormevar/Aathis Rohethar fic for The Chronicles of Osreth.

I posted the 2 most recent The Hunt fics, and all 3 fandom fics are for Hendrey/Cash (fic 1, fic 2).

I posted 1 of the 32 Link/Tauro fics. I also went looking back when I posted and at least back then I couldn't find Link/those funky tower mechanical arm tentacles, so maybe I was the first with that? Only two fics pop up when I search for them now.

This is another fandom where it's hard to track things due to active fandoms, backdating, etc., but I recall I published the second Jaskier/Radovid V fic, and maybe the first focused on the Netflix show version (the one prior to that, as I recall, was game and/or book focused). I remember being surprised there still weren't that many when I posted my second one. Pretty sure the pairing was still in the double digits. There are now 326. I published one of the first couple fics for Filavandrel aen Fidhail/Vesemir, and I believe the first or second to specifically focus on their incarnations in The Witcher: Nightmare of the Wolf. There are now 37 fics.

This isn't a pairing but I somehow published the only fanfic for the Tomb Raider Top Cow comics tag? Similarly, I started the Golden Sparkle by Minta Suzumaru tag.

I published 1 of 32 fics for Anna Valerious/Gabriel Van Helsing for Van Helsing (2004).

I published the third of 5 fics for Dietfried Bougainvillea/Claudia Hodgins from Violet Evergarden. I think the last published before mine (that's currently a WIP) one came out cause I went on a sort of hiatus while posting.

This is another fandom where it's hard to track things due to active fandoms, backdating, etc., but my fic is listed as the 9th for Rand al'Thor/Ishamael. There are now 45.

My Shutendouji/Ryo fic is the seventh and most recent fic for the pairing for Ronin Warriors. When I originally made this post, it was the sixth. I assume someone backdated a fic or retagged it.

I published the second of the now 10 Jin Marito/Tahide Outa fics for a fandom with now 82 works (Bucchigiri?!).

This is another fandom where it's hard to track things due to active fandoms, backdating, etc., but I think I posted one of the first 20 Gongyi Xiao/Zhuzhi-lang fics for The Scum Villain's Self-Saving System. There are now 96. I posted 1 of the 30 Liu Qingge/Zhuzhi-lang fics.

There are 46 works in the Kyuujitsu no Warumono-san webcomic tag and 8 in the anime tag. I think I posted the third Akatsuki Red/Shogun fic (and there are now 13), and the first Rooney/Shogun fic. There are now 3. I've posted the second of the 2 Shogun/Yoiyami Black fics.

I posted fic #4 in the See You My King/The King and Me tag, and the first Xiao Wei/Evtiti fic. There are now 2/3(?) (it's hard to tell because the tag hasn't been wrangled). I also posted the eighth and most recent Mimi/Zhang Li fic. There are 10 fics total.

I posted the first fic for Lang Qianqiu/Xiao Mengyou or Lang Qianqiu/Xiao Shiwei, but I believe the second fic about Xiao Mengyou (the first one didn't name him). There are now 12 fics in the tag.

I posted technically the second fic of the 2 for Peach Blossom Debt. The other fic is just two words that say, "Coming 2024". Mine is the only one for Song Yao/Hengwen Qingjun.

I posted the second most recent of 9 total fics for The Imperial Uncle, and it's the second for Jing Chengjun/Liu Tongyi.

I posted the most recent 2 of still 3 fics for The Deer King, which includes 1 of 2 fics for Hohsalle Yuguraul/Van Gansa, and the only fic for Hohsalle Yuguraul/Makokan.

I posted the still only fic for Joseph Huh/Yongsoo Ahn in a fandom that I think had a lot fewer fics before mine back when I posted it, but it has 55 now. I am using the official English translation spellings. I'm not sure what Ao3 is using.

I posted one of now 9 total fics for Choi Jong-In/Sung Jin-Woo in Solo Leveling.

I posted the second and most recent fic for Jaehwan/Karlton Javier for The World After the Fall. The fandom tag has 31 fics now.

I've posted 2 of the 15 fics for Anubis/Khnum in ENNEAD (fic 1, fic 2).

I've posted apparently the second of 3 works tagged for Lee Hakhyun/Yoo Joonghyuk for Omniscient Reader's Viewpoint.

I've posted the second of two fics for Chronos/Zagreus in the Hades fandom. I've posted the only Heracles/Icarus fic. I posted the first of now 10 total Odysseus/Moros fics.

For Blood of Zeus, I've posted the latest of 5 fics for Apollo/Seraphim. I posted the last two Seraphim/Heron fics in the 10 fic tag (fic 1, fic 2).

Not a ship, but I posted the first Mithrun & Milsiril fic for Delicious in Dungeon.

I'm currently writing a series of non-existent ships in the Ayashi no Ceres tag. Thus far I've posted one for Alec/Ryurik and another for Alec/Kagami. I have five others planned, all for unique ships that have zero fics. The only m/m fic in the fandom tag is only tagged for characters from another series.

I've written two of the 12 Lawrence Bluewer/Edgar Redmond fics for Kuroshitsuji (fic 1, fic 2).

For The Sea Beast (2022), I wrote one of the five Jacob Holland/Original Character fics, and the only tagged Jacob Holland/The Surgeon fics.

For BoJack Horseman, I've written one of the 69 BoJack Horseman/Mr. Peanutbutter fics.

For Bridgerton, I've written the only Anthony Bridgerton/Lord Lumley fic.

For Epic: The Musical, I wrote one of now seven Eurylochus/Odysseus fics.

For Dark Rise, I've written one of 46 Anharion/Sarcean fics.

Reblog and put your rare pair in the tags/comments! I want to see the depths people will go to create, for the most random two characters in the most obscure media.