schneefink

Canon divergence AUs are my favorite genre of Vorkosigan Saga fics, here are some I enjoyed a lot.

Permutation by

mzminola
37k, mostly gen, canon divergence
Summary: AU where Aral's first wife lives, and they have multiple children. So far exploring gender, marriage, and reproductive politics on Barrayar, primarily through the lens of the eldest.
Why I like it: I really like Kalyan and the changes and aspects explored here.

Petya 'verse by

lannamichaels
268.2k, various, canon divergences
Summary: The main series page for all fics containing Piotr Richars "Petya" Vorkosigan, the AU son of Aral and his first wife (named Therese for my purposes).
Why I like it: Cheating a little, this is multiple AUs and I didn't want to choose. It's been long enough since I read them that I don't remember which one was my favorite, but I enjoyed them a lot.

Lord Gregor by

avanti_90
55.8k, gen, canon divergence
Summary: An alternate universe in which Prince Serg Vorbarra did not die at Escobar, but lived to become Emperor of Barrayar.
Why I like it: Good look at this possible AU; this just got a new installment this month which I enjoyed a lot.

+ 1 isekai:
I Transmigrated Into Cordelia Naismith! by

lannamichaels
33.6k, "Cordelia"/Aral, isekai fix-it
Summary: What was I supposed to do? Not fix everything?
Why I like it: I very much enjoyed the pragmatic and thorough approach to "fixing everything."