Fire Dancer -- Geth Trooper (with a sort-of PSA about Flamer too!)

Combining the previously-exclusive Flamer, wallhack madness via Hunter Mode, and arguably the worst of the defense powers (but still quite usable!) in Fortification, the Geth Trooper was given flaws but given ways to make up for them as well. With Fortification offsetting the shield penalty from Hunter Mode, and both of those giving liberal boosts to power damage, the Geth Trooper ends up being a mobile armor-melting platform that can still take a hit or two.

Flamer: Devastating armor, setting up Fire Explosions everywhere, and causing most organic health targets to fire dance, I don't have any qualms saying that Flamer is one of the best skills in the ME3 multiplayer. With both of the GTrooper's passive powers boosting it, the damage becomes obscene, and due to the way its cooldown works, he can carry some pretty heavy weapons without serious repercussions.

Fortification: While probably the weakest of the armor powers, 40% damage resistance is absolutely nothing to scoff at. Boosting power damge is also a tasty bonus. It's also interesting to note that the Geth Trooper is the first character so far to get two kinds of passive powers that can be active at once. DEVASTATOR MODE EMPLOYED. MISSILES AT THE READY.

Hunter Mode: Hunter Mode not only boosts your weapon and power damage, but also gives something incredibly useful but often forgotten; situational awareness. How often have you turned the corner cautiously, only to be surprised by a Phantom or Brute or simply a horde of enemies right in your face? This lets you know where anything and everything is within 24 meters of you. That's as far as a range-upgraded Shockwave. You can assess situations, shoot enemies through walls, or know when to flee rather than fight.

The rank 4 upgrade depends on your weapon, and you may not get much use out of the Power Recharge if you're not loading him up with heavy stuff due to Flamer's cooldown mechanic, but if your weapon is already accurate, no reason not to take the Recharge. The rank 6 upgrade is also a matter of preference, but I find being able to see farther and move faster much more useful than doing just 10% extra damage.

Weapons: I chose the Wraith due to its accuracy over close and medium ranges and its solid damage, but really any weapon that can help you at range is advised. You have your Flamer for close-range fights, so as long as it can hit things reliably outside of Flamer's range and hit them hard, it's probably a good choice. You can take along an Acolyte for backup, but after taking it along for five Gold matches I found I wasn't even using it. The Wraith did just fine at taking down shields.

Closing thoughts: I think this guy is my new favorite character. He absolutely destroys. Not just armor, everything. Anything he looks at, he melts. Fortification lets me take the wayward hit or three if need be, which is way more than the other Geth can say. With Hunter Mode I'm rarely taken by surprise, and just like the computers can, I can start attacking enemies as soon as I round the corner since I know exactly where they are. I know which passageways are safe to retreat to, and can plan accordingly. It feels like most other classes are playing with a full deck, but his deck is nothing but Aces.

And now that you've read the build, here's the PSA: If you activate Flamer immediately after firing the last round in your clip, you will do the reload animation while Flamer is active. Additionally, deactivating Flamer works as a reload cancel, so you can keep up a constant stream of attack by shooting, Flaming, shooting, and Flaming. This is why I chose the Wraith, but the Crusader, Harrier, Hurricane, and other guns with a nice balance of clip expenditure time vs. reload time should work too. The only mandate is that Flamer will have needed to finish cooling down before you fire your last shot.