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"Funnest" character to play is the N7 Shadow. Not the most effective as intended, but a completely different playstyle.
My personal favorite, from start to finish, is the Turian Sentinel. Although he was almost over-taken near the end by the Vanilla Human Adept. Up to Gold I played him with an Incisor or Phaeston, Gold and higher I tended to take a Lancer or a Hurricane.
My favorite "lore-friendly" kit is the Asari Vanguard rocking a Disciple.
Asari Vanguard with a Supressor and the Battlefield 3 Soldier with an M-98 Widow are some of my favorites. I love getting quick/easy headshots and surprising new players when they complain about my loadout and then I'm the only one alive and score higher than them (not that I care about scoring high, just pointing out it's a decent build). I also like using the Falcon for easy ammo priming with any class that has concussive shot or throw for fancy explosions.