Okay, feel free to throw tomatoes at me: I voted for Connor!
While I do agree that his character is for the most part bland in comparison to the other assassins, I enjoyed the simple story surrounding the young assassin: revenge. Also, I think the motivation surrounding his own father, Haytham, was a solid outing in which Connor could develop as an assassin and character. Ultimately, I kind of like Haytham more than his son, keeping the old plot twist in mind!
Also, I feel like Connor's overall 'blank slate' allowed me as a player to almost assume the mantle of Connor. I felt as if I was the assassin.
In terms of character, I think Ezio takes the cake in a storied development. You see a man, young and brash, eventually develop into a well-refined individual coupled with a calm ruthlessness that helps him develop as an assassin. With Roger Craig Smith taking Ezio's reigns as the voice, it just makes Ezio even cooler!
Brotherhood was the chance I had to sit with Ezio, since I never had the chance to play II, which appears to be the primary fan favorite. (Well, I've played parts of it, at least!) I also think Altair is pretty cool, since like Connor, he plays a more silent role on some respects. I enjoyed his relatively simple story in the first game. Since I have not played
Revelations, I cannot speak for Altair's story, but from what I hear, his character develops immensely.
As for Eddy and Aveline, I have not played their respective games, so I cannot speak for them. Both, I think are unique assassins in their own right! Our new friends have an interesting aura about them. I like Arno's character because he seems rather refined, like Ezio, but has this air of ruthlessness and dedication, much like Altair. His robes are also really something, too. They look as if they represent the discord of the French Revolution. Shay, on the other hand, looks extremely refined, and his robes and attire are extremely organized. Such is the parallel between Assassin and Templar. I personally am looking forward to play as Shay, since I really like his design, and I think his character has an intriguing setup at hand. You can count on me buying
Rogue, also because the next generation eludes my grasp!