Drell Adept. Favorite class by far: biotic detonations are way too much fun.
I also really enjoy playing as Krogan; meleeing everything to death in a blood rage while cackling maniacally... makes me feel all fuzzy inside.
I do also enjoy the human engineer for the well roundedness. It's not something I'm often dying to play, but it's a very good support class and easily stands on its' own two feet if necessary. Plus, a Brute trying to take on a combat drone is utter hilarity.
Aaaaand finally, I just unlocked the Turian soldier last night, but so far I'm really loving it. I have a thing for Turians... and also proxy mine... Put them together and I'm in heaven.
Origin name is Trippid. I have off nights where it feels like I can't shoot to save my life, but we won't talk about that.
I'm down for playing whatever, whether that's having a good time tripping over swarmers, or knocking banshees around on gold.