That’s a really good question! I’m actually very picky about fanfics. I normally just read oneshots and I read fanfics of some series more than others; I barely read any SM fics. However, I do have some great fics that I can recommend!
The Legend of Diana:
This is one of my favorite pieces of fanfiction! It tells the story of the very first Queen of the Silver Millennium, Queen Diana. Diana was born as a commoner during the time when there was no kingdom on the Moon; the people of the Moon lived in small, isolated cities. Diana was given a task by the Moon itself (manifesting itself a handsome young man who calls himself Lun) to unite the cities into one kingdom and bring an end to the many wars that ravaged the Moon. Lun also creates the Ginzuishou and gives it to Diana so that she could govern and protect her people.
I won’t spoil the rest of the story, but I promise it will keep you riveted! There are only six chapters and it goes by very quickly. I love how this fanfic provides a background to the Silver Millennium, something we know next to nothing about in canon. The writing is wonderful, too! I really recommend giving this a shot!
As a bonus, here’s a picture of the beautiful Queen Diana, as drawn by her creator, silver-eyes-blue, a very talented artist and writer!
Serenity’s Heritage: The Silver Crystal:
This is quite honestly one of the best Sailor Moon fanfictions I have ever read!
It has a wonderful fairytale quality; you feel like you’re reading Sailor Moon as a fairytale! It’s rich with imagery and adjectives, but it doesn’t feel too flowery.
It tells the tale of how Queen Serenity, the Ginzuishou, the Princess, and the Sailor Senshi came to be in the Silver Millennium. It’s simply wonderful, and deserves to be read!
This fic tells the story of who Sailor Heavy Metal Papillon was before she joined up with Shadow Galactica. What I really love about Butterflies is that it goes into detail about her child; in the Materials Collection, Papillon is stated to have a child, making her the only Senshi besides Sailor Moon who is a parent.
The fic really goes into my own headcanon, which is that Papillon was coerced into joining Shadow Galactica because of something involving her child. Once again, highly recommended!
Darkness at Heart:
I haven’t read this in a while so I can’t go into very much detail, but it’s a Silver Millennium fic that focuses pretty much exclusively on the Senshi and how they came to be Serenity’s protectors. It’s wonderfully written and very good!
Hotaru explains what she loves about her Michiru-mama, Haruka-papa, and Setsuna-mama. She cannot remember her other parents (Prof. Tomoe and Keiko, her birth parents), but she adores her mamas and papas.
UTTERLY ADORABLE AND MUST BE READ
The story of the daughter of Neo-Queen Serenity and King Endymion who ISN’T Chibiusa. In fact, it seems she was born instead of Chibiusa. She lives her entire life in the shadow of the sister she never knew.
WARNING: This story sorta fucks with your brain and heart and is hella depressing. I loved it, though!
Well, that’s all I have for now! Feel free to recommend any if you have them!