I loved Babylon 5. With the exception of the original series of Star Trek, I found it to be the best written sci-fi series I have ever seen.
I love the characters and character arcs too! Oddly, the one I care the least about is Sheridan as he is fairly one-dimensional and stays pretty much the same throughout (apart from the obvious event, which I won't go into here!)
My favourite character has to be Lando, although I liked G'Kar too!
I'm busy re-watching the 3rd series now actually!
shame about the game being rubbish though..