Stories specifically about the Courier's companions. Probably my favorite category on here.
And One More for the Road by djsoliloquy - https://archiveofourown.org/works/601471
Boone. Lily. Christmas. Angst. (Warning: Boone-Lily Christmas angst.)
Linger a Little Longer in the Twilight by moon_crater - https://archiveofourown.org/works/10654881
Arcade goes through a Jewish mourning ritual, and Raul is a bro about it. (Warning: other characters also try to be bros, with varying degrees of success)
Tag, You're It by PercyByssheShelly - https://archiveofourown.org/works/572687
Another one of my favorites. Arcade desperately tries to save the Courier Corps from Six's hormones and naïveté, with... debatable results. (Shippy alert: A love dodecahedron that includes around nine characters. Twelve if you count unmentioned canon love interests. Mostly unrequited, very funny.)
Bad, Bad Whiskey by QueenCazador - https://archiveofourown.org/works/928782
Cass receives bad news, and handles it about as you'd expect. She and Six have a conversation about God. (Warning: about what you'd expect. Cheesy, maybe, but that's my cup of tea.)
Non-Negotiable by ReachForTheStars - https://archiveofourown.org/works/14991224/chapters/34744706?view_adult=true
The crew discusses which side to take in the war. (Warning: Cass and Boone are immature; Arcade is a nerdy communist)
Secret Ingredient by stpitbull - https://archiveofourown.org/works/371433
Six has a breakdown, Grandma knows how to help. (Warning: Boone is manipulated into his own brand of helping. lol)
Feline Fine by AndeliaMaddock - https://archiveofourown.org/works/17074136
Boone finds a cat. Feelings are mixed. Everything is adorable. (Warning: Yeah, yeah, "gruff man finds a small animal" is an overplayed trope but it NEVER GETS OLD)
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Bob's Top 100 Fallout Fanfictions
FanfictionOr, why the Internet was a mistake and Bob needs to visit a psychiatric hospital. But seriously, give these authors some credit.