Lets see... There's scruffy's pdf on the first post of the first few forts, which has 12 overseers. I had a list after that for fort 3 under this spoiler, which is 12 more overseers
Year One Spring?: Enisea [New Embark]
Year ?: Naryar
Year ?: DS
Year ? to 205 Summer: Scruffy
Year 205 Autumn to 206: Summer: Naryar
Year 206 Autumn to 207: Summer: vyznev
Year 207 Autumn+Winter: Random_Dragon
Year 208 Spring+Summer: DS
Year 208 Autumn+Winter: Basin is BACK
Year 209 Spring+Summer: Scruffy
Year 209 ? Scruffy: (!!Magma Holiday Edition!!)
? to Year 210 Winter: Shoruke
Year 211: PeterisP (Fortress falls due to Gobbos)
Then Here is the turns since v40, 17 or 18 of them, depending on how you count.
Kamin: 40.01 Year 1! The perfect start to a new iteration. Also, Mantis Queen.
Random_Dragon: Year 2: Keas are bastards and Weregoats are dangerous.
Yoink: Finished most of Year 2: Exploding dropped babies.
AustralianWinter: Crash!
Naryar: Year 3? Horrified Dwarves everywhere!
Scruffy: 40.03! Leaking Magma Moat, song lyrics.
Kamin Returns! and proceeds to pull a Bobnova.
Uggi: Magma! Magma Everwhere!
Jimmy: Drunken Savant manages to start the fort towards recovery.
Lovechild: 40.11? Starts a new fort, 3peaks! ALso, WereGeckos
Shoruke: Year 2! Tantrum Spiral begins.
Nordinkel: Year 3 Spring to Winter: Who let the WereGeckos Out? Who? Who who who... it was him.
Scruffy: Year 3 Winter to ?: Dangerous Caverns and lever of doom construction
EinsteinSatDown: Too drunk for too long to take over after Scruffy. Good attempt though.
Yesaja: Year 4? Pulled lever of doom, causing much mayhem.
Shoruke: Year 5? to summer: Entomb ALL the ghosts. Butcher ALL the animals!
Shoruke again: finished year five, general madness.
Other Year Acht: Jervill: Accidentally loaded the wrong save.
Year Nein: EinsteinSatDown: Magma and Goblins: Not a god combo.
The other issue is counting years or turns, because those are very different things, even if they weren't intended to be at the start. Also scuffy explored two of the forts in adventure mode.
But Yes, I do believe Scruffy has been the most prolific, although not by so large a margin. I organized the dorfing list mostly by # of turns, then by earliest turn, then earliest post in the thread for bystanders.
Scruffy (engraver) -recently known for "wrex" effect, longtime and most often !!Overseer!!
Bobnova (Male)-Longtime !!Overseer!!, known for getting one thing right and another wrong, also self-injury
Naryar (2sneaky4u) -longtime player, known for stability & keeping DDF going
Clover Magic (Gems) -Usually started new game after Wrex
Kamin (Drunken Master) -Our founder and fan favorite
Yoink -moved into recent prominance
Random_Dragon (chaosvolt) Weregecko Fighter
Wrex (Manager) -Known for "wrexing" early forts into ruin and black-out
Shoruke -(Kaliche)Rather descriptive turns
Stadekxiel -very intoxicated, 24 hour turn passing out in media res
Siquo -Important early figure
Jervill
Australian Winter (engraver) -known for long real time turns
Ruhn -started a few forts
Vzynev -Random Pics, nice IRC log in tongues
Renofox -unfairly persecuted by crashed games, also had 10 hour turn at drunken gamer/mlp gathering
Enisea -surprise overseer
DS -Recently joined the ranks
One-hit Drunkards
rcmgames
Absinthe7
Nonsequitorian
Animarytak
Graebeard
A_500
codyorr
Demdemeh -Known for Mrs. Dwarf's assistance
Flanderbrand
Korbac
Dolwin
Falafel Sandwich
Skakerag
Bragos (lazy dwarf)
Iawastooshort
Lovechild
Basin is Back
Peterisp
uggi
Jimmy
Lovechild- Started new fort in new version, tri-peak fort designer
Nordinkel
EinsteinSatDown
Yesaja
Commentators
Th4DwArfY1
Great Wyrm God -debate over sleep deprivation, no-one has tried that yet
Scelly (Spearman)
Misko27 (Sober, Bookkeeper)
Mrwillsauce
Xantalos (Eldritch)
MarcAFK
Maximum Zero (Maxclone, male, Smith/Soldier)
Peregarrett (Captain of something)
Lord Inquisitor (Male, Brewer)
Johoutar (Qaamanen, female, Food)
Urist McPenguinhead (Axedwarf/military)
Trif (Engraver/doctor)
Bluemagic (Marskdwarf)
Trifle (assistant to Australian Winter)
Metruption (doctor)
IronTomato
Omeganaut
Sappho
Lolfail0009 (The mad, Swordsdwarf)
Krevsin (military)
Movie
tahujdt
Dutchling
Captain McClellen
Helgoland (broker)
Objective
Melting Sky
NekoexMachina
Swonnrr
SanDiego
TheFlame
MafiaWhale
Sheaim
Shakerag
KingMurdoc