A Super Strength / Energy Aura brute would work well I can see the defense of your partner going through the roof. Plus it would work thematically as they both have a tech feel about them.
@Boy Wonder
Quantum Flash - Ill/Kin Controller
Leader of the Legion of Heroes
Color me weird, but I'd suggest an Ice/whatever (Thorns gets my vote) Dominator. Or even just an Ice/Cold Domination corrupter. Gah, even an Ice corrupter would work.
Since you'll be all range and defense, having an ally that can totally retard the [censored] out of enemy mobs will be pretty much cake. Most Ice sets do that very nicely. If it's a corrupter you're partnered with, I'd suggest traps. It's a nice swiss army knife tool and it'll stack it's defense on top of your secondary's own.
As for the Dominator, if it's not a pure ice/ice, I'd actually suggest thorny assault. The attacks all debuff something keen...and an impaled/immobilized enemy is doomed when surrounded by a swarm of laser-toting robots.
Just my 2 cents.
-jared
Any buffing corruptor would be nice, though a dark/kin would excell thanks to -acc on attacks and fulcrum shift etc
Just another question, will maneuvers, tactics and assault stack if multiple people in group has it?
Lately i have done alot of duo with a bots/dark MM with my 38 Ice/Cold Corruptor, it works great. I can unleash full ae madness in each fight without any risk. I debuff and slow bosses into oblivion while his bots pummel them, my sleet and snow storm along with his dark stuff makes each fight into a cakewalk.
I would definetly recommend it as a great duo even with a /FF botter.
Whats good with a MM? More minions! I'd recommend a Bots/Dark MM to complement - more AoE ranged attacks, and AoE debuff/healing goodness. FF's will shore up the holes in Miasma (bonus defense, status protection).
Stack up some Assault and Tactics as well then go to town!
Yeah, cant really go wrong with another MM...
But more fun and diversity with something else imo 
More diversity? Yes. More fun? Not necessarily.
One of the most fun teams I have currently running is a team of five zombie/dark MMs. The sheer mass of pets is hilarious and everything is running so smooth it feels a little bit like cheating. This team is less efficient in narrow caves or something like that, but the sight of all those undead bodies stepping on each other to get to the enemies is well worth it. 
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
Ahh well, opinions differ then i guess :P
On a side note, i dont really think MM/Brute is that good a combination. This might just be because i have a Necro MM and as such any brute has to compete with my deadboyz for both agro and space up front. Might be better with bots, letting the brute get all the agro he wants...
Yes, the MM/brute duo is viable option with robots, but I would still prefer a MM/corruptor or MM/dominator mix (or a MM/MM duo). For dominators the choice of powersets doesn't matter too much, but for corruptors you should perhaps avoid secondary sets with too many single target buffs as this would probably complement the MM and his henchmen the least (or turn the poor corruptor into a pure buff-bot).
Off the top of my head I would say Dark, Rad and Sonic secondaries would provide good results.
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
Hey guys, im kinda new to this mastermind thing, and ive played around with thoughts for a long time to try CoV and a MM.
So now the time has come, and im wondering what would be a good duo with a MM, ive allready my mind set on the robots/FF setup.
what would a good duo with this be, another MM with same setup or something similar or doesnt it matter much what to duo with, since i noticed villains dont have a healer like the defender :-)
curious to hear your thoughts.