Proof that the remaining 10% is worth retelling the Rail Tracer's story for here:
These are recommendations made by Tropers for Baccano!!Fan Fics, all of which have been signed. After a few samples, you will be able to judge whether you might be interested in the 'fic, based on who recommended it. No-name recommendations will be zapped. Nobody would back up the rec. Discussion of the recommendation is welcome on the discussion page. As such discussion is important, do remember to add the discussion page to the watchlist, if need be.
Do warn when a fanfic may head into non-canon territory. Some people just don't like it, and as we all know, Shipping is Serious Business.
Synopsis: Eve Genoard's continuing efforts to rescue her brother bring about some unexpected consequences, including (but not limited to) kidnapping, arson, concealed weapons, severed fingers, and a high-stakes game of billiards.
Comments: I may, admittedly, be a little biased where it comes to this story, as it was written in response to a request that I made. But even if it hadn't been, it would still without question be the single best piece of Baccano! fanfiction I've read thus far. Picking up where the light novel Drugs & the Dominos leaves off, it follows Eve Genoard and the Gandor brothers through the same sort of Crazy Awesome tangle of events that characterizes the novels and anime. Everyone involved is characterized to best effect, and it's written very much in the style of the source material, complete with gambling imagery, some clever plays on Luck's name, and several instances of comedy amidst the Mafia action.
Synopsis: "Growing up as a Gandor and growing old as a Gandor: Keith tries marriage, Luck tries ambition, Berga tries uncledom, Claire tries everyone else."
Comments: As the author says, it's a hugely speculative fic — but she juggles the dynamics well, making plausible such "speculations" and managing to confront the mortality issue without letting it take over the story.
Synopsis: "Senator Beriam attempts a coup; Rachel and Elean attempt semi-professional heroics; a number of persons attempt unique varieties of assistance. Result: stupid commotion?"
Comments: Not very many fanfics can capture the style of the original work well, and in the case of a work as stylistically unique and complicated as Baccano! not many fanfic writers bother trying. This author certainly tried, and in my humble opinion succeeded. Also, this may or may not be the same Becca who wrote the fic at the top of the list; I'm really not the one to ask there.
Synopsis: What is it like to belong to a psychopath?
Comments: Another excellent Ladd/Lua story. Interesting coincidence that the troper above also recommended a Laylah fic — initially I was about to recommend both her fic and this one. Excellent characterization, beautiful syntax, and just absolutely gorgeous writing. One of the best Baccano fics I've had the pleasure to read.
Recommended by Dude Wheres My Password and ZSEDC 4
Synopsis: When you've got an immortal lifespan ahead of you, you can afford to take things kinda slow.
Comments: With all due respect to the other great fics that have been recommended here, this may be the single best Baccano! fanfic I've ever read. The writing is excellent, I can't find any fault with the characterization, and the overall effect is amazing.
Comments: I think this may be one of the best Baccano fanfictions I have ever read. If I hadn't known better, I would have guessed this story to have been a translated excerpt or chapter from the original light novels. It was just that good. The characterization and interactions between Firo and Ennis were beyond anything that I could have thought of myself. One hundred seventy-five points.
Synopsis: "The first time Jacuzzi Splot thinks about kissing Nice – properly kissing her, firmly on the mouth rather than bussing her cheek – he is fourteen and a quarter and she is radiant." In which Jacuzzi waits and wants, and might finally find his courage.
Warnings: sexual implications, including mentions of attempted rape
Comments: A poignant, believable exploration of the history of Jacuzzi's gang and of the development of his and Nice's relationship.