Oh, hey, I suppose it's time for another round. I'll do my best to avoid repeats.
I'm a WHAT now? My Surprising New Job! - Sailor Moon SI. Wait, wait, don't leave yet! The writing is solid, the plot isn't transparent, and the SI was structured very well as part of a larger AU antagonist group.
E.L.F, Extraterrestrial Lifeform - Worm/40K, Taylor alt-power. She's a Farseer. With the souls of apparently all the surviving Craftworld Eldar stuck to her, from what appears to have been some sort of last-ditch effort to vacate the premises. Sorta-fusion; the Warp is known to exist in this Wormverse, though it's relatively calm, meaning
only the pre-active-Chaos-gods nasties wandering around.
If you weren't paying attention, Anime Addventure is dead. The good news? Dungeon Keeper Ami's author now has the
full archive up on SV,
and is continuing to write it.
Covenant - Worm/V:TR fusion. Taylor doesn't trigger. Nails the creepy-disturbing feeling of proper bloodsuckers. Christ, it's creepy. In a good way.
The Lion Awakens,
The Lion Unleashed - Legend of the Galactic Heroes/Mass Effect. Yes, you read that right. Yes, it's well-written. Yes, it does dabble in the first contact cliche, but god damn it's a LotGH fic that a) EXISTS and b) isn't shit.
Advice and Trust - NGE. Wait, seriously? Nobody's recommended this yet? NGE in which Shinji and Asuka manage to be slightly less socially retarded. Easily a contender for the best NGE fic ever written. WAFFy, but god damn do they deserve it. Read this if you care at all about the setting or characters, because it captures both very well through a lens only slightly shifted.
Magnara - ASoIaF/Girl Genius. I'll avoid spoiling anything and just leave you with this: Agatha dumped north of the Wall some time before Robert's Rebellion. Fuckin' excellent and going places to boot.
For Those We Cherish - RWBY/40K. Near the end of their penitent crusade, the Lamenters are spat out of the Warp onto Remnant. The heart-of-gold Marines doing what they do best: being some of the least shitty people in the Imperium.
Wearing Robert's Crown - ASoIaF SI. The best one. It does two things that I've never seen from an SI fic. The first is that the entire story is told from the perspective of other characters, not even a single line from the Robert-SI's point of view. The second is a massive spoiler. Excellent writing to boot. Read it. Read it now.
Miracles of Ancient Wonder - Exalted/RWBY fusion. No, actually. Very well written, and possibly the only Exalted crossover I've ever seen that actually writes in an appropriate tone and uses the Exalted fluff and crunch for something beyond an easy powerup for a character in a different setting. I've already said it twice, but fucking read this. Nails the tone perfectly.
Arc of the Revolution - RWBY AU. In which Jaune is not admitted to Beacon, steals a horse from a Maiden, and accidentally takes over the world. Delicious contrast between Jaune's perspective of stumbling his way through incredibly dangerous situations by the seat of his pants, carried along by ample assistance from others and more than his share of luck, with that of anyone trying to deal with him and only seeing him
as an incredibly dangerous person. This, this is the Jaune fic we needed to break him of his curse to be Xander's heir in the fanfic community.
‘Hazredous’ Interruptions - MGLN/RWBY. What's that? A Nanoha story that's a crossover? That involves more than one or two characters? That's alive? That isn't shit? Gods below, it's a miracle!
Constellations - Worm/Okami. Taylor gets a Good Dog; Danny triggers with QA. Another quality fic from Unwelcome Storm. Plenty of humor. Just... don't read the comments in the thread. Shitposts, shitposts everywhere.
El-Ahrairah - Worm AU. Not going to spoil it. Superb writing. If you caught the reference you'll probably enjoy it.
Aaaand now for a couple quests.
Ours is the Fury: House Baratheon Quest - Hammertime, baybee. No fat whoremongering Roberts here, no sirrah.
Battle Action Harem Highschool Side Character Quest (No SV, you are the Waifu) - What it says on the tin. It's a mashup of about half a dozen different haremshit settings, with the players guiding a side character to become important enough to the story and popular enough with the audience to gain a spinoff series of their own. Very long gaps between updates, but the updates are around 10k words each. Fun stuff.