Dryad!
Because of the range attack mastery. I have a thing for range attacking in all games!
But a very close shave between her, Dragon Mage and High Elf. I also love the Seraphim with great CA at taking on groups of enemies. I'm playing with 6 of the 7 characters at the moment I just don't like the dark side so it's a no-go for the inquisitor.
The TG is kind of weak, or maybe it is just me.
The High elf has like no HP. died twice in like the first 20min of play! but once she gets a few levels, she kicks ass!
Shadow warrior is also not bad, because he of nether allegiance! it just helps with killing mobs!
Seraphim is great for learning the game, but not just for noobs!
I play with the character that I feel the most like. If I had a bad day at work and felt like hacking up and crushing skulls of clients, then I play with the melee and force characters (Seraphim, Shadow warrior or Temple Guardian) If I want something more strategic and mind working, then the Dryad or the High Elf, and more male power then the Dragon Mage.