Author: Estrella/estrella30
Website/link to fic: Estrella's due South fanfiction, her fic on DSA
Fanlore page: Estrella on fanlore
First DS fic posted: 2004
Full disclosure: Estrella was kind enough to beta for me a few times back when I was a newbie
Pairings: Fraser/Kowalski, Kowalski/Vecchio, Kowalski/Frannie, Kowalski/Billy Tallent, Kowalski/Stella, Kowalski/Gardino, Frannie/Welsh, gen.
Style and strengths: Estrella's character voices are spot-on. She writes humour and tension and hawt porn, and she's a mistress of the bickering-as-foreplay genre. She often includes action and/or references to cases, which help ground her fic in canon.
Other DS/C6D activity: Estrella has also written two Men With Brooms fics (one a crossover with Hard Core Logo), and one Wilby Wonderful story. Her C6D fic is on her Other Fandoms page.
Some favourites:

Mr. Cool (F/K)
I think this was one of the first of Estrella's stories that I read, and I adore it. It was written for the Fraser Fucks Up challenge on ds_flashfiction, and it shows a Kowalski who's tough and irritable and smart, and a Fraser who... fucks up. :-)
( Excerpt. )

All Talk Ray/Ray
Snarking and sex. <3
( Excerpt. )

Lipstick (F/K)
Porny pornish porn! Established relationship. Summary: "Work just didn't get any better than this. He'd get to hang out with Fraser all night, in a strip club, guarding a porn star, and get paid to do it."
( Excerpt )