Blossomwitch is an amazing writer, and her fics are usually entertaining and worth a read, especially the two mentioned above. She has awesome characterization, and keeps with canon in most cases. There's a bit of slash at times, depending on the fic. All in all it's good work, and worth reading.
Windswift is the queen of poignant, brilliant little oneshots. She seems to work well with minute snapshots - she literally has hundreds of them posted, very few of them surpassing a thousand words. Windswift, however, despite her lack of long fics, is my personal head-canon. She's hopped her way through every character and pairing in the show, touching them all lightly with the softest, most compassionate eye, and then moving on. It takes an hour or more to get through all of her drabblish fics, but it's a very enjoyable, thought-provoking hour, and she really does have something interesting to say about everyone. Windswift has never written a fic that wasn't for the whole family, but her ideas and style are very adult. Tropers who try her out are in for a wonderful time.
Creepstakes is easily the best erotica writer in the fandom. She always has an incredible blend of interesting, entertaining, and arousing in her fanfiction, and almost never sacrifices her plots. Her take on the characters and her ability to amuse a reader and continue to amuse them are a gift. Her plots are addictive and always leave me gasping for breath, and she's not afraid of writing rare pairings and new ideas. The majority of her work is male-slash, and explicit male-slash at that - she's delved into sadomasochism, guro, and many other not-nice things, so tropers not looking for darker, libido-driven fics should give her a miss, and even those who don't should remember to heed all her warnings. Still, Creepstakes earns her place as one of the best writers in fandom.
This website hasn't been updated since 2001. Still, it's the last bastion of the late and greats, Lulu White Tenshi, Sahari, etc., people who have long since left this fandom. I can't think of a single fanfiction on this site that didn't blow me away, and Silent and Still, my personal favorite fanfic of all time, is housed here. The pairings are mostly Yusuke/Kurama, with some deviations, but they're all proof that people were active and amazing in this fandom long before my time. I mean it when I say that Sans Enigma is always worth a visit, even if you've been there a hundred times. The day it goes down, I'll cry. (Silent and Still has an off-site sequel by a different author, should anyone be interested, called Overcoming Chaos.)
Blueutopiah likes to explore the darker edges of the yu yu hakusho universe in her fics - where the demons are demons, the characters don't always fall in love, and the endings aren't necessarily happy. Her stories are well-characterized, well exectued, and she doesn't hesitate to shock as she carries you along for the ride. I enjoy reading and re-reading her fics because she has a terrific grasp on the canon and I still find new things on every re-read. If you're a yu yu hakusho fan at all, this author is a must.
Sekahyyh is tremendously talented and her fics are original, sweeping, and epic. From the level of detail to the vocabulary to the characterization to the research, you can feel the weight of her writing and her stories read less like fanfiction and more like published works. Although her main focus is Karasu/Kurama, she appreciates some of the more forgotten characters in fanfiction, like Toguro, Genkai, and Mukuro, giving them layers and depth. Her erotica is unique and real, her non-con is gruesome and disturbing (such as in Counting Crows), and she not only writes yaoi, but het and yuri as well. Sometimes I walk away from her works shaken, lost in thought, or insanely jealous. She's amazing.
Kowareta Tsubasa is a brilliant writer who has a very intellectual spin on the Yu Yu Hakusho characters. No matter who it is she writes, she can manage to make them sound like the most amazing and mesmerizing characters in the world. I would recommend her to anyone who is getting sick of all of the Transplanted Character Fic in Yu Yu Hakusho fandom, as her writing ability will make you fall in love with the characters all over again. Her scope ranges from the main four to Sensui and Itsuki to the Three Kings (particularly Mukuro) to Toguro and Genkai- and she makes it look effortless to keep them all in character. Highly recommended.
Thoth Moon is another writer who can add great intellectual depth to the Yu Yu Hakusho universe- not to mention she actually shows her work whenever she has to go beyond YYH canon to find something relevant to her fics. Her NC-17 rated stories are very playful while remaining true to the characters and making the reader think, as well as retaining the requisite Togashi-level Gorn where it is appropriate. In this troper's opinion, Cockroach in particular stands out because it is the most comprehensive Deconstruction of Mr. Seahorse that he has read in any fandom- but the other fics are excellent as well. A must-read.
Now, seeing the sheer amount of OC-centric stories in this writer's profile is enough to throw even some of the least judgmental readers off. Don't let this fool you, though- Graphospasm is one of those few fanfic writers who know how to do OCs right. Her original characters are easy to relate to, believable and entertaining. Her fics are fun without feeling too bubbly, and they all have plots worth getting into. Some of the early chapters of her fanfiction (such as Future Talk) are slightly off-putting in their... typicality, but Graphospasm has grown as a writer and her stories have grown with her. The canon characters don't take the back seat, Kuwabara is treated like a great person and nobody is OOC. Fics this troper would particularly recommend are "Fakes & Fiends", "Future Talk," "School Daze" and "Touched."
These two have collaboratively produced the funniest series of YuYu Hakusho fanfiction this troper has ever read. There are a few minor spelling errors, and people twitchy about male/male relations had best give "Grandfather of Fire", the seventh in the series a miss (the Hiei/Kurama is present in most of the others, but not in center focus), but this crackverse is well worth dealing with those minimal flaws. This troper clearly remembers both her and her brother reading it as young teens and not only not being permanently scarred by the experience, but laughing so hard our faces hurt. Great stuff... and the later crossover of the Quinverse with Weiss Kreuz is just as gut-bustingly funny.
Stories focused on the family and the friendly relationships of the cast. Plot-focused stories or light day-in-the-life stories. Pretty much anything that isn't focused on romance.Changing Death by borderline_mary
Synopsis: Six months after the Dark Tournament, Kurama goes on an important mission that is kept secret from the rest of the team. The results of this are catastrophic, and things may never quite be the same for anyone.
Synopsis: Dying didn't spell the end for me. It gave me a chance to save a world, and a new shot at life. Only, to get that shot, I had to give up my everything. To save the people I've come to love in this new world, what must I give in exchange?
Synopsis: The Best Defense is a Yu Yu Hakusho/Harry Potter crossover of epic proportions, noticeable for its twisting of a trite stereotype (the Tantei going to Hogwarts to help out in the fight against Voldemort) into something truly enjoyable that is somehow more than the sum of its parts.
Synopsis: Crossover with Star Trek: The Next Generation. While moving refugees and hunting down a dangerous ship with lethal cargo, two unexpected guests come to help them on their quest. Their names? Hiei and Kurama.
Synopsis: It's really an incredible fic that's almost hard to define - it's not so much about Kurama and Shizuru's relationship, but more the science fiction elements of the plot. It's very erudite, and transcends normal romance. Post-series.
Synopsis: Kurama, the great strategist, chafed under Yomi's rule in canon. Leashed is a behind-the-scenes look at Yomi and Kurama's relationship, done in an intriguing, almost aggressively non-stereotypical way. It could fit comfortably in the Three Kings Saga without hurting anything, post-Yomi's summons, pre-Shura.
Synopsis: Set post-series, this fic is about bad guys, good guys, and the return of Kuronue. Kurama feels ill with premonitions, and a series of events leads him back to his ex-partner Kuronue. It's a very clean story that always reminds me, despite artistic license and liberties taken, of Yu Yu Hakusho canon.