Number of bad guys shot, by character.
Derek Morgan: pulling into the lead by a nose with either 2.75 or possibly in second with 2.25 (Charm & Harm (split with Elle), Lessons Learned, Open Season (*possibly* split with Prentiss), and Legacy (split with Hotch, Prentiss, and the CotW).
The late, lamented, and very butch Elle Greenaway: still a strong second, (unless she's actually first) despite having left the show in 2x05, with 2.5 (Extreme Aggressor, Charm & Harm (split with Morgan), Aftermath)
Aaron Hotchner, moving back in the field with 2.25 (The Tribe, A Real Rain, Legacy (split with Morgan, Prentiss, and the CotW)
The unassuming but deadly Dr. Spencer Reid, still a strong fourth-place finish at 2 (LDSK, Revelations)
Emily Prentiss, a freshman but still in the field, with either .25 or .75, depending on whether one of those gunshots in Open Season was actually hers, or if all three were Morgan's. The .25 is the other quarter of Charles Holcomb in Legacy, who went down like the Titanic. And she's operating at a 27-episode disadvantage.
Everybody else? Zilch. Garcia doesn't kill people, J.J. has a count of three dogs and my eternal respect (and if we ever see her in a a firefight, I suspect she'll do just fine), and Gideon has, I believe, only once discharged his weapon. (Psychodrama, a futile shot across an aqueduct.)
You know, for most cop shows, after two seasons, 45 episodes, that list would be a heck of a lot longer.... We have a real bring 'am back alive ethos going on. If I tried to do that for NCIS... my fingers would fall off. *g*
Upcoming, eventually, a round up post on the pro-and-con drug addiction arguments... *g*
(ETA 05/18: I did my math wrong, and had to make a correction. *g*)