I have!
I have written, and completed four, and am in the process of writing five more.
All the completed ones have been from tv shows. My first was a Miraculous, and it was a OC I created on the spot, with Felix Gram De Vanile.
The next three were more recent. all of them are actually for BNHA, a show I actually have not watched, but my best friend loves it, and I like the concept. I have an X Kirishima, X Tamaki, and a X Dabi. All of them are with OCs I created for the Fanfiction. I am actually in the process of posting one of my completed fanfics on Prose. Unfortunatly, I can't post my miraculous one, because I accidentally deleted it. :(
All the ones I am working on are BNHA as well, save one, which is a Spiderverse one. I'll probaly delete that one, though. I don't have a direction I want to go with it.
I like to write fanfiction, because I love being able to put characters in situations, and it modivates me to keep writing, so I don't get rusty.
Have I ever written fanfiction?
God have I ever.
It was literally how I used to practice my writing... damn does this bring back memories.
I do believe that Drarry must have been the first fanfic I wrote. Plus a bit of Dramione, but those ships I never published.
I've always had a bit of an obsession with the Harry Potter fandom, not as much as some people, but more than most. It's the only fandom I've consistently posted stuff in, all my other fandoms I've only ever written unpublished stuff or just read and silently lurked, occasionally offering up a comment to the creator.
Yeah... other HP ships I wrote were Wolfstar - honestly it's my OTP over everything else, I can't even begin to describe it. I've published the most under this ship, however I do not believe I have written the most about this ship. That title would have to go to either Drarry or one of my other rarepairs.
I've also written some fanfic about the founders - I had a miniseries where they were deciding how to build Hogwarts, and if you can imagine children in grown adult's bodies that would be relatively similar to how people describe my portrayal of them.
I've written a disastrous attempt at a fanfic of Heathers - a whatif where Veronica didn't reach the school in time, and I will admit the attempt I published wasn't the best, as I was writing it on the spur of the moment and on my phone, but my rewritten draft and second half were somewhat decent and less OOC (and so more believable from the characters), but I never got around to typing them up and posting them, and now I've lost the drafts which is kind of mournful.
Then let's move on to Throne of Glass - which I have so many rarepairs for. The annoying thing about smaller fandoms is that when you do come across an epic rarepair you have four fics in total across all platforms and three of those are smut. It sucks, but I ended up writing some more, and never posting them, which is also quite sad. It was mainly RowanxAedion, DorianxAedion, and LysandraxAelin, the latter of which I believe is slightly more popular anyway.
Aside from that, most of my other written fanfic comes from taking a plot of the book, and then putting my own characters in it and changing the situation slightly and seeing how they react. God I have so many of my old works which are exactly like that. The first (major) story I wrote, which I believe reached approximately 35,000 words - though it was on paper and I'm discounting the copious amounts of notes that I made on it, so beyond a few basic calculations I have no idea how many words it was - before I abandoned it, at least, was based off a story with a similar plot. The origin for my latest story - which coincidentally I finished, though I did skip out quite a few plot points so I could get the whole story written and not lose hope in the project, and I believe it is currently sitting at a similar word count to the aforementioned story, if you discount all the subtracted scenes and scenes which I am yet to write up - comes from a YA novel, though I will admit that, beyond a few themes which crop up in both books, is very different to how I started it. I mean for god's sake I was going to kill off a suicidal character who had just decided that she was going to overturn how dead set she was on killing herself and live instead, just to hurt her best friend/the reader. But I didn't, and I have plenty other characters which I am killing off instead, as well as several angsty sections where there is plenty of miscommunication.
Quick sidenote: I also made a plan of this Doctor Who fanfic I was going to write, which was basically going to replace 12, as when I first watched him I didn't like him. Didn't end up writing it, but I can't say as though my opinions of him have changed that greatly.
But yeah - that's a quick timeline into my journey in writing fanfiction. My journey into becoming obsessed with fandoms is much longer and had so much more variation, but that's a story for another day.
This all just reminds me of a thing one of my favourite authors - to read her opinions about writing, anyway, I'm pretty sure I haven't actually read any of her work yet - Mercedes Lackey, I believe it was, though I could be wrong about this - was talking about some time ago.
Everyone has about a million words of crap in them, that they're going to have to write before they can write decently.
My writing ability has progressed so much since I first started writing fanfiction, and I don't really write fanfiction much anymore - though I wish I did, because right now I am so deep in the Sander's sides fandom it's a joke and I wish I could contribute to the fandom but I believe I would need to actually watch the source content first, before contributing anything major, unlike Heathers, where I just dived straight in without any regard for what may or may not be OOC.
But yes - fanfiction will always have a special place in my heart, even though I don't write much anymore. I love it, especially the freedom we have today with it, because there have been times when authors have really cracked down on fanfiction, especially on the internet.
Goddamn that turned out long.
I have! I'm in the process of writing a multi-chapter story for the anime RWBY, and I've done several one-shots for it as well. I also dabbled a bit in Doctor Who. I spent a really long time just reading fanfiction rather than writing it myself because I could never wrap my head around characters that were made by someone else.
However now that I've started writing my own, I find that writing fanfiction is actually an amazing way to practice storytelling in general!
You can practice outlining, character development, plotting out character developments, scene placement, setting, transitions, the whole thing! Fanfiction gives you anything and everything that you need to learn to captivate an audience, while also providing the skeleton of a world that already exists, along with either fully formed characters or just half formed characters that you can flesh out into full ones.
I'm an avid advocate for fanfiction writers and people looking to expand their storytelling skills. That's primarily the reason I decided to write a fanfiction in the first place, was to get general practice for plot development, because laying out a plot is my weakest link in writing. I've had amazing success so far, so if you're ever looking to start writing fanfiction, I cannot stress this enough. Do it!