Here are 13 of my favorite minor characters from Diana Gabaldon's books (in no particular order):
2) Tom Byrd. I love the chemistry between him and Lord John.
3) Lizzie. I love watching her transformation from a scared young girl, so shy she almost couldn't talk, to the self-confident young woman we see in ABOSAA and ECHO.
4) Rachel Hunter. One of my favorite new characters in ECHO, and a remarkable young woman -- intelligent, insightful, and she even gets along well with Rollo! A perfect match for Ian. <g>
5) Master Raymond. An intriguing character, and very mysterious. I hope we see him again in Book Eight.
6) The White Sow. I love watching her antics. She's definitely a scene-stealer, especially in ABOSAA.
7) Tom Christie. I think he's one of those characters who gains more depth on re-reading. I didn't like him much at first, but his sacrifice for Claire in ABOSAA took my breath away.
8) Rob Cameron. I knew he was trouble, almost from the moment he appeared in ECHO. But definitely a memorable character!
9) Laoghaire. Whatever you feel about her, you can't deny that she's had a major influence on the course of the series!
10) Frank Randall. I know a lot of people disagree with this, but in my opinion Frank was an honorable man who got thrown into an impossible situation after Claire came back, and did the best he could with it.
11) Ian the Elder. How lucky Jamie is, to have had such a friend. "Guarding your weak side", indeed.
12) Geillis Duncan. Say what you want about her. Without Geillis, we wouldn't have Roger, or Jemmy, or Mandy, and we wouldn't know anything about the use of gemstones for time-traveling.
13) Geneva Dunsany. For a character who appears so briefly, she really had an enormous impact on the series as a whole.
What about the rest of you? Do you have a favorite "supporting character" or two? And what is it that makes them memorable? (If you want to cite examples from ECHO, please go right ahead.)