Okay, I'm gonna cheat here and pretend that "supporting character" means it's someone we see regularly (like, once a season or so) and not just someone who happened to come back once or twice. And no, I'm not counting Jimmy Palmer as supporting character, he's a regular who gets wrongly billed. *glares at TPTB*

Anyway.

With that definition firmly in mind, there's absolutely no doubt whatsoever who my favorite supporting character is: TOBY!!!

Gotta love Fornell. He and Gibbs are so awesomely hilarious together. People keep saying they're like an old married couple. To me, they're like the NCIS-version of Waldorf and Statler. And I can see them sitting on Gibbs' front porch once they're retired, snarking at each other and the neighbors. *g*

Okay, and since I tend to not give simple answers *g* I'm also going to officially state that, as far as characters that appeared more than once go but aren't strictly "supporting" (as in, regularly recurring), the two dads (Jackson and Senior) share the number one spot with Fornell (and Jimmy, I guess *g*).