I have two favourite characters (Jedi/Sith)
SITH: Darth Vader is the best bad guy and I like Vader as he is a character that represents the 'Dark Side' and more importantly my favourite scene in Star Wars (in ANH) is where he picks an officer on the Death Star and tells the officer 'I find your lack of faith distrubing....' The officer was then given the GRIP treatment.
However without Vader, there is no story as most of it involves him.
JEDI: Personally I'd feel it would be Obi-Wan. Like Vader, there is the constant presence of his character which represents the honesty and honour of what a Jedi is. In ANH his character was not extensive as he was an old fighter that had to meet his student on last time. In TPM, we got to see him as a young man who was learning and came accross as good guy who had fought for good.
Both of these characters are my favourite characters as they both are critical to the whole story. Thats what I think
'Its worth it all in the end when We Are On The Other Side Of The Moon and thats good enoguh for me"