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A Beginner's Guide to HTML and CSS on AO3 by the_untamed_poet25
Fandoms: No Fandom, Fandom - Fandom, AO3, Original Work
06 Jul 2026
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Summary
You've seen it. A fic formatted like a classified document. A chapter that looks like a real social media feed. An interactive game, somehow, inside an AO3 work. You clicked the kudos button. You thought: how.
This is the tutorial that answers that.
A beginner-friendly guide to HTML and CSS on AO3 — no prior coding experience required. By the end of this series, you'll know enough to write formatted fics, build your own workskins, style your entire AO3 interface, and maybe make something that makes other people stop and think how.
Series
- Part 23 of Izzy's HTML & CSS Experiments
- Part 2 of HTML/CSS AO3 Skins & Tutorials
- Language:
- English
- Words:
- 39,899
- Chapters:
- 7/?
- Collections:
- 4
- Comments:
- 169
- Kudos:
- 1,042
- Bookmarks:
- 1,550
- Hits:
- 28,957
Bookmarked by Casterisk
03 Jul 2026
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The Scientist's Lament by Agapostemon
Fandoms: Harry Potter - J. K. Rowling, Fullmetal Alchemist: Brotherhood & Manga, Fullmetal Alchemist - All Media Types
11 Sep 2023
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Summary
Following Al's restoration, the Truth sends the Elric Brothers to another universe with zero information. Neatly forged paperwork lands Ed a job teaching summer school remedial chemistry to children who are older than he is. Due perhaps to cosmic ineffability one of these summer school kids can lead the Elric brothers to precisely who the Truth had in mind. Book 6, Brotherhood.
- Language:
- English
- Words:
- 210,814
- Chapters:
- 53/53
- Collections:
- 7
- Comments:
- 1,487
- Kudos:
- 3,665
- Bookmarks:
- 996
- Hits:
- 124,645
Bookmarked by Casterisk
18 Jun 2026
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Summary
After the end of the Triwizard Tournament, Harry is alone and struggling to find a way to hang on to his sanity when an unexpected boon walks into his house and kidnaps him to Gringotts. The Most Noble House of Nott is attacked and Theodore is left with nothing but ashes, a single gemstone, and the burning fire of something bigger than himself lodged forever in his soul. Lucius Malfoy suffers a momentary lapse in sanity and raises his wand against the Dark Lord. The lines between light and dark, good and evil, blur together and disappear entirely. All the while, Harry goes searching for who "Just Harry" is and keeps coming back to a dark-eyed Slytherin he never thought he'd call his friend...
Series
- Part 1 of The Living Library
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Cubes by overripeTomatillos
Fandoms: Pocket Monsters | Pokemon - All Media Types, Pocket Monsters | Pokemon (Anime)
24 Nov 2024
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Summary
To his human coworkers, Sean is a competent aide to the engineers. Having an extensive work history and great professionalism, none of them would ever consider he could be a Zoroark, known tricksters and general troublemakers. He is surprised he has gone this long without being noticed. The humans of Goldenrod, he concluded long ago, are much less wary than those of Unova.
Click to expand more detailed summary containing mild spoilers.
Sean Black, a Zoroark who fled from Unova decades ago, has been content pretending to be a human. He works for a tech company making MRIs, which is interesting enough to him. The other disguised Pokemon in Goldenrod have been seriously considering revealing themselves to humanity, notably the long lived Ninetales. When one his coworkers mysteriously is transformed into a Pokemon by Mew, their plans are greatly accelerated.
- Language:
- English
- Words:
- 133,982
- Chapters:
- 27/38
- Comments:
- 218
- Kudos:
- 268
- Bookmarks:
- 85
- Hits:
- 19,991
Bookmarked by Casterisk
29 May 2026
Bookmarker's Notes
THIS IS SO COOL??? It's just, so cool, I might change this when I'm less sleep deprived.
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The Friendly Necromancer by Sengachi
Fandoms: Pocket Monsters | Pokemon - All Media Types
23 Dec 2023
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Summary
Banette is a pokemon that exists to give meaning to abandoned and discarded things. They evolve from their first form, the ghostly Shuppet, by possessing abandoned dolls. But when an ill-treated boy dies alone, a friendly Shuppet he named Diya takes it upon itself to give his life meaning. Diya possesses and revives his body, becoming a Banette, and sets out to make the boy's dream of becoming a pokemon trainer come true.
Along the way Diya makes friends, fights some pokemon, finds a deep and abiding love of scarves, blurs the line between living and dead, accidentally becomes a necromancer, and to everyone's surprise even finds the time to accomplish its original goal and catch a pokemon or three.
This lovely fanart is by Large_Egg, posted on their account here. Go give them a comment if you like it!Series
- Part 1 of The Friendly Necromancer
- Language:
- English
- Words:
- 116,883
- Chapters:
- 24/24
- Collections:
- 4
- Comments:
- 809
- Kudos:
- 1,668
- Bookmarks:
- 748
- Hits:
- 66,551
Bookmarked by Casterisk
29 May 2026
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Summary
Harry had a secret.
He had scales on his skin and slitted pupils, fangs and a forked tongue. The only ones who knew of it were the Dursleys, and that's how Harry intended to keep it. That is, until he met Neville Longbottom on the Hogwarts Express and a Basilisk deep in the bowels of Hogwarts.
Harry could have never expected how those meetings would change the course of his life.
- Language:
- English
- Words:
- 112,339
- Chapters:
- 21/?
- Collections:
- 5
- Comments:
- 1,168
- Kudos:
- 5,392
- Bookmarks:
- 1,902
- Hits:
- 121,911
Bookmarked by Casterisk
25 May 2026
Bookmarker's Notes
I need more Creature fics like this. Completely agree with you, down with the Inheritance BS.
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and the credits roll, by HazyDayzz
Fandoms: New Dangan Ronpa V3: Everyone's New Semester of Killing
01 Jul 2026
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Summary
“Danganronpa is the latest and greatest in Killing Game Entertainment! As they are the pioneers of their craft, they try to incorporate bigger and better gimmicks into each season. With the fiftieth season and beyond came the ‘implementation’ feature! As Danganronpa moved to virtual reality to host their seasons, it became possible to program not just avatars for our Players, but false memories, talents, and personalities as well! All of this has allowed the characters to come to life before the audience’s very eyes!
“See, there’s a special little agreement that one must sign before the game that’s part of the audition contract! It gives the Player the option to keep all of the artificial junk that Team Danganronpa stuffs into their head under the condition that they win! It’s an optional prize, but who wouldn’t want to keep their very own—very special—Super High School Level talent!?”
A single checkbox makes Shuichi Saihara’s world spin.
A single check mark makes Kokichi Ouma’s world break.
---
Or, the killing game ends, but not everyone is back where they started.Series
- Part 2 of Just Enjoy the Show
- Language:
- English
- Words:
- 72,175
- Chapters:
- 13/20
- Comments:
- 321
- Kudos:
- 1,331
- Bookmarks:
- 254
- Hits:
- 27,958
Bookmarked by Casterisk
09 May 2026
Bookmarker's Notes
Might have to add CH10 to one of my all-time favorite fanfic chapters, along with CH28 of Entirely Out of Spite and CH7 of Keep Lying to Me
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Mewtwo Reborn: Ash's Metamorphosis by CoboltJoxter77
Fandoms: Pocket Monsters | Pokemon (Anime), Pokemon The First Movie/Mewtwo Strikes Back, Pocket Monsters | Pokemon - All Media Types
02 Jan 2026
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Summary
When Ash is hit with the combined force of Mewtwo and Mew's attack it doesn't turn him to stone or kill him, but rather causes a few....unexpected changes.
Bookmarked by Casterisk
24 Apr 2026
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Summary
Shortly after Casita is rebuilt, the Madrigals get back work in the community.
Until Camilo goes missing. Almost three years later, and the Madrigals gifts have long since faded from the pain of his disappearance.
The BAU get a new case, as well as a lot more than they can chew when they find a delusional, kidnapped boy, and try to get him home.
- Language:
- English
- Words:
- 91,222
- Chapters:
- 18/19
- Collections:
- 11
- Comments:
- 1,466
- Kudos:
- 4,165
- Bookmarks:
- 742
- Hits:
- 84,786
Bookmarked by Casterisk
27 Feb 2026
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Summary
Beginning with Draco's unexpected arrival at the Dursleys, Harry's summer after sixth year becomes filled with activity and many secrets. As his summer progresses, Harry generates several unexpected allies as he finds himself actively becoming the leader of the Light side. H/D post-HBP ~~Complete~~
- Language:
- English
- Words:
- 395,365
- Chapters:
- 62/62
- Collections:
- 51
- Comments:
- 1,851
- Kudos:
- 20,950
- Bookmarks:
- 8,051
- Hits:
- 1,114,356
Bookmarked by Casterisk
27 Jan 2026
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a deal in diamonds (memento vivere) by aurae_rori
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
18 Apr 2024
Tags
Summary
“When I die, the IPC will reclaim all of my possessions. I have no surviving family members; nobody will cry for me.” The last bit comes from the collapse of wishful thinking. A bit of sentimentality. Is it part of the act?
Aventurine… nobody would cry for Aventurine. The man who went all in, who tried to bet against the world, the one with good fortune on his side. Flashy smiles, good perfume, and a crisp and clean fashion sense - the hollow shell, the disposable pawn, the uncannily lucky gambling chip.
“So in every sense that matters, I have nothing to lose.”
The crease between Ratio’s eyebrows deepens whilst his movements grow still, as if battling with some sort of internal conflict. Aventurine watched as he comes to a conclusion, turning his gaze to him fully, and then speaking,
“I’d mourn you if you died.”
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based on @portalmonsterrr's comic on twitter! it's called memento vivere on there as well, please check it out, because that is what inspired this. <3
- Language:
- English
- Words:
- 4,200
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 110
- Kudos:
- 1,805
- Bookmarks:
- 232
- Hits:
- 12,832
Bookmarked by Casterisk
09 Dec 2025
Bookmarker's Notes
Found this through the art on twt, thank you for this 🙏
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Gather the Scattered Fragments of Your Broken World by vahveroinen
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
04 Nov 2025
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Summary
"Hold on, please," Phainon says, grabbing hold of Mydei's arm in desperation, trying to keep him on the bed.
Mydei doesn't listen. He pulls himself free, striding across the room to tear open the curtains obscuring the only window. Outside the window, he can see the source of the light that had blinded him:
There is no newborn sun of the new dawn. Instead, Kephale's Dawn Device still towers over Okhema. Below them, the city is eerily quiet.
This is Okhema frozen in time, its citizens gone. Even the birds have been silenced. An afterimage of the past, of time together they'd sacrificed in search of the new sunrise. None of this can be real—a beautiful dream crafted to deceive him, only one that is now fraying at its edges, showing the rot underneath.
"If this is the Era Nova, then where is the sun we were promised?" Mydei whispers under his breath.
---
When Mydei gasps back to life after Amphoreus' last cycle, the world he returns to is no longer the one he remembers—and neither is Phainon waiting at his bedside.Or Mydei wakes up on the Herta Space Station.
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when the sun hits (i'll be waiting) by k1tschii
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
04 Nov 2025
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Summary
“I could hear prayers,” Mydei says abruptly. "I assumed you didn’t know; I doubt it’s something I ever would have had the chance to tell you. But it started immediately after I acquired Nikador’s Coreflame.” He stares out at the square—the marble of rebuilt statues winking where the city once stood in embers.
“Prayers,” Phainon echoes weakly. “So you—“
“I heard every prayer,” Mydei continues, his gaze flitting to the ruins of the Dawn Device. “Including the ones from you. I know you didn’t know.” His lips quirk up. “You never would have been so honest otherwise.”
Three months after the battle with Irontomb, Mydei and Phainon begin to navigate the ways that they have changed in the aftermath of the eternal recurrences—and what that means for their relationship.
Series
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Veritas Ratio V.S. The Universe by cakecats
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
15 May 2026
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Summary
Apocalypse: Star Rail might be the worst game Dr. Veritas Ratio has ever played. In what world is murdering half the known universe for no reason even remotely reasonable? What kind of game kills off its most compelling characters just for shock value?
Also, why is he now in the game — and as a damn NPC, out of all things?
【 Activation Code: “Moronic developers, moronic game.” It is our sincere wish that during your time, you can fulfill your desires and, in accordance with your wish, transform a piece of moronic work into a magnificent, high-quality, first-rate classic. Bound Role: Unnamed male NPC of the Veritas Prime star system, age 0. 】
【 Congratulations! Welcome to Apocalypse: Star Rail, version ██! 】
Well. If these idiot developers can’t take constructive criticism, Veritas might as well construct the criticism himself… by forcibly inserting himself into a plot where he’s never existed.
Series
- Part 1 of Veritas Ratio V.S. The Universe
- Language:
- English
- Words:
- 124,104
- Chapters:
- 19/?
- Comments:
- 2,107
- Kudos:
- 5,575
- Bookmarks:
- 1,353
- Hits:
- 144,356
Bookmarked by Casterisk
05 Nov 2025
Bookmarker's Notes
Absolutely brilliant; the amount of work this author put into their work is astonishing, and I cannot wait to read more.
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Harry Potter and Some Other Nerds by Idknoname
Fandom Harry Potter - J. K. Rowling, Percy Jackson and the Olympians & Related Fandoms - All Media Types, Percy Jackson and the Olympians - Rick Riordan
29 Mar 2026
- Words:
- 696,115
- Works:
- 3
- Bookmarks:
- 236
Bookmarked by Casterisk
07 Oct 2025
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the sky is blue and grass is green (keep lying to me) by YORUGATA (soppity)
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
16 Jul 2025
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Summary
Deku talks as much as he did when he was alive. Chatters on and on about this or that. It’s become background noise at this point, so he doesn’t mind all that much.
"Are you sure you aren't just up here to try and kill yourself again?"
'Ever the tactful one, I see.'
Deku's become awfully blunt after dying. He can't tell if he appreciates it or not."
Or,
Bakugou Katsuki after Midoriya Izuku dies
Series
- Part 1 of call me fighter (I'll mop the floor with you)
- Part 1 of The Angel, the Monster, and the Puppet
Bookmarked by Casterisk
12 May 2025
Bookmarker's Notes
By far my favorite iteration of Bakugou Katsuki. This was stunning.
I think all of my thoughts I have on this fic can be summed up in the comment I made on the last chapter BUT- don’t read it pls, if you’re reading this for some reason.
Going into this fic blind is the best experience ever.
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Nurture My Nature by TripleBerry (Rieka)
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
04 Jul 2026
Tags
Summary
Midoriya Izuku possessed the kindest quirk in the world. He would use it to become the most gentle hero of them all.
And he would bring hero society to it's knees, beheading it before the world.
AKA: the youngest son of All for One was shackled into heroism. He would make them regret it.
Series
- Part 3 of The Villain Auction
- Language:
- English
- Words:
- 206,139
- Chapters:
- 66/?
- Comments:
- 425
- Kudos:
- 965
- Bookmarks:
- 186
- Hits:
- 44,970
Bookmarked by Casterisk
10 May 2025
Bookmarker's Notes
A surprisingly fun ride. I just imagine the author sitting at their table, cackling madly like the insane genius they are as they continue to write. In here, the tonal whiplash hits just as hard as, “Tomu-nii!”
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Small Town Streamer by SomaHoliday23
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia
30 Sep 2024
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Summary
Izuku is trapped in the small town of Green Valley, working at a café to support his mother and himself. He’s lonely and bullied at school. The only enjoyment he can find in life comes from playing video games and watching the streams of his idol, Dynamight, a famous Twitch gamer.
Katsuki, aka Dynamight, is coping with the loneliness of fame by focusing all his energy on becoming the #1 Twitch streamer. He learns of his parents’ plans to move the family to some tiny-ass town in the middle of nowhere... named Green Valley.
--------------------------------A very fluffy BKDK Twitch streamer AU with some small-town flair!
- Language:
- English
- Words:
- 94,072
- Chapters:
- 39/?
- Collections:
- 28
- Comments:
- 2,951
- Kudos:
- 6,459
- Bookmarks:
- 1,364
- Hits:
- 178,407
Bookmarked by Casterisk
31 Mar 2025
Bookmarker's Notes
Absolutely beautiful, no questions asked. I normally don't read AUs often, cuz my attension span can't it through most of them but this, oh boy.
9 chapters in at 2:13 AM, fuck yeah.
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Tanya in Tensura by TanJaded
Fandom 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), 転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | Regarding Reincarnated to Slime - Fuse, 転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse
25 Jun 2025
Summary
Series for my fic "That Time I Got Isekai'd Again and Befriended a Slime"
- Words:
- 381,618
- Works:
- 2
- Bookmarks:
- 55
Bookmarked by Casterisk
27 Feb 2025
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Summary
AU of PoA. Harry wakes in the night to a voice calling him from somewhere in the castle—and when he follows it, everything changes. Updated every Friday.
- Language:
- English
- Words:
- 613,877
- Chapters:
- 155/155
- Collections:
- 2
- Comments:
- 7,224
- Kudos:
- 24,292
- Bookmarks:
- 6,663
- Hits:
- 1,282,145
Bookmarked by Casterisk
24 Jan 2025
Bookmarker's Notes
Need to finish this one because it’s really fucking good, it’s just rather long.