I'd focus him on debuffing & healing, so accuracy debuff & healing enhancements. Not sure if recharge reduction is needed, AFAIK he'll be recharged by the time he expires.
G-Force
For MMs, he needs 3 Rchgs to be perma, so I would (will, in 2.5 levels 
) slot him 3 Rchg 3 Tht_Debf.
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
Cheers guys. Right enough other MM's advise 3 recharge but some i've spoken to use a combo of Heal Holds and Acc?
Tht_Debf will go well with the other Dark DeBuffs i reckon.
You want 3 rech for sure. After that, it's a personal preference between hold, heal and ToHit.
FYI, the hold recharge is 16 secs, and base duration is 11,92 against critters.
Think I went for 3 recharge, 2 acc and one hold.
I prefer the acc over heal for the simple fact that a boosted heal is not much use if it doesn't hit when you need it to.
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You want 3 rech for sure. After that, it's a personal preference between hold, heal and ToHit.
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Hehe , i'll stick with the 3 recharges and give him a Heal,Hold and a Tohit as well , make him a Jack of all Trades 
I went 3 recharge, 1 acc (which flaws everything in PvE I believe) and 2 hold
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
as a corrupter i slot mine 1 (or 2, cant remember) acc and 3 -tohit. I tend to summon him on EBs or difficult bosses and find he's very survivable if the mob is within his chill of the night aura. You will need some recharge as has been said but i'm not sure you will need him perma with all your other pets. I don't keep my fluffy out all the time even though he's perma, he can do more harm than good sometimes, but use your discretion.
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
With pets its very handy keeping him perma, as they tend to split into two groups, one runs in, one hangs back. He likes to hang back too so he can heal the pets that dont run in
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
My Fluffy is 1 Acc, 3 Recharge, 2 To Hit Debuff.
I opted not to go for Heals or Holds, because he only uses those once in an attack chain - however, he's constantly debuffing to hit. My own Twilight Grasp is also usually more than enough to cover any healing requirements, and most foes are often dead before becoming unheld. The only other slotting I'd consider would be 1 Acc, 3 Rec, 2 ImmobDur - for AV fights.
@Synaesthetix
"Here, take some more bees with you. You may need them."
Union: FU//LoUD
"that Syn is that that" - Mothers Love
Along with the Lich and the Ghosts use of holds and my two I find the hold slotting usefull for natural EB fights (IE not AVs that have been downgraded) If I summon him on the EB he uses the hold first, then with my holds and the ghost and lich cycling the EB will remain static. Of course this relies on him cycling his hold, but it comes around often enough to make a difference.
With my merc/Dark I wont be slotting for holds, will probably go for 1 Acc, 3 Rec, 2 Immob becuase it will be my only source of Imob on that alt other than me and I like stacking them
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Hi Guys
My first time with Dark Servant and it seems everyone i ask slots their fluffy in different ways.
For a mainly solo build using Thugs with no pvp in mind what would be the most recomended way of slotting the little fella?
Thanks in advance.