I find all my Trigun fics by randomly reading stories of it written by authors I like (who I've usually stumbled upon while reading a different fandom), then I check their favourites and read all their good Trigun (or insert series here) stories and so on and so forth until I hit a dead end. This usually keeps me busy for awhile, though it depends on the size of the fandom and how many good stories it has. I also rec all the good stories I read in my ficrecs journal. I don't get many recommends of fics unless I ask for them, but I'd suggest doing what I do to find some good Naruto fic. Slog through ff.net to find one, then check that persons favourites to find more etc. It works so long as people remember to update their favourites:) I'd recommend some naruto fic to you, but I haven't seen enough of the show to feel confident enough to read a story without getting massive spoilers.