Mine is probably the Geth Trooper. I normally run it with an Assault Rifle and without hunter mode. I love being able to flame enemies without the squishiness of the Vorcha.
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Awakened Collector Adept with the Collector assault rifle (which I sometimes switch for the Reegar Carbine). Oh man, just thinking about this makes me want to go back and play some ME3 multiplayer. Funny how I was so against ME3 having multiplayer at first and then it ended up being the best part of the game...