indeedle

Here's the top 5 as I remember it.
1st X-plosive: 26 kills (Tanker, Retribution.)
2nd Thrusty: 25 kills (Blaster I think, AoW I think)
3rd Quarks: 22 kills (Brute I believe, Evil I think)
4th Gutts: 19 kills (Stalker Evil I think)
4th Knight Stalker: 19 kills (Scrapper, Retribution)
5th Wesley K: 18 kills (Scrapper, Retribution)

There were 26 fighters, 288 kills, and a whole lot of running.
A special mention to Up urs and Glowing Darkness who were the only people not to register a kill.
Oh and I have screenshots of most kills from the FFA so if any-o-body would like to comment further I can post those to prove who was attacking who.

inherent mez protection to me suggests perma-able protection against the big 3 mez's
Hold
Sleep
Stun
Bubblers do not fit that bill as they are vulnerable to sleeps.
Controllers with psi epic dont have perma-able mez protection since ED.
Khelds can go dwarf as mentioned.