This fandom was all due to Maldoror, who I followed from Naruto to One Piece. That must have been sometime in 2006. The fics are a mix of humor, slash, or both. There may be some het in the authors' archives. EDIT: 5/5/17, to clean up broken links and reorganize.Authors:
~As mentioned, Maldoror has some great stuff. Specific highlights:
-Like Steel for Chocolate (Sanji has an unusual skill when he cooks in a state of high emotion)
-Up on the Peak (Kaku of CP9 has lost his purpose; Zoro finds it for him, ironically enough)
-Interlude for Eight Straw Hats and One Giraffe (In which all named parties are coincidentally at the same place at the same time)
-Hot Seat (CP9 tries out - and wears out - several candidates for Director)
-The Games of Fate (Lucci left behind a pregnant OFC who seeks Paulie and Iceberg's help)
-The World's Greatest Swordswoman (Zoro isn't bothered by a Devil Fruit user's genderbender curse, although Sanji suffers an existential crisis when he has to be courteous to fem!Zoro)
Sadly, most of the prolific authors whose fics I liked have left the fandom, and tossed aside their works at the same time. RIP, Paxnirvana (your Smoker/Ace long!fic will haunt me), Ecphrastic (so funny!), and PTPS (you made crack!fic sound reasonable). Those who are still left have some drabbles and longer fics in their LJ Memories:
~An Officer and Some Gentlemen, by Y. St. Ace. Smoker and Tashigi are forced to attend a cotillion on a civilian island. Hijinks ensue. Gen.
~Communication, by Jaelle. The Strawhat crew use a Dendenmushi for their own, silly, purposes. Gen.
~One Piece, Version Two, by Sakurazuka_jae. If the canon members were, uh, not available. The replacement crew is just wonderful. Gen, some implied slash (Navigator --> Captain, Captain --> Marine).
~Raptus Regalis, by Mettathron. AU that was jossed by the 2016 Sanji arc, but nevertheless makes a good guess at the twisted dynamics of his family. Warning for cannibalism. Mostly gen, perhaps a little Sanji/Zoro.
~Rubric, by Manic_intent. Smoker and Ace have a plotty, adventurous romance. Great OCs, particularly the female D. character, and some really good scenes. Smoker/Ace.
~Rules of Love, by Sabershadowcat. Sanji and Zoro are crewmates, with benefits. They certainly aren't in love - or, at least, Zoro knows Sanji isn't. Sanji/Zoro.
~RUMBLE!, by TreeStar. Luffy eats one of Chopper's Rumbleballs, to his detriment. Luffy/Zoro.
~Seven Deaths, by X-Parrot. Sanji defiles a priestess and must undergo ritual cleansing. Except none of that is precisely true. Zoro stands by to keep his nakama from giving up. Gen.
~Switch Switch, by PeroxidePest17. Another genderbender Zoro fic, with the predictable result of Sanji/Zoro.
~Whores Are Cheap (But Not For Zoro), by Alita B Angel. Zoro meets Johnny and Yosaku "at work". How they eventually end up traveling with him, the next day, depends a lot on the night before. Zoro/Johnny/Yosaku.