The rise and fall of Londo, the earth war, etc etc were unique elements, as far as I know that didn't have any real "influence".
The rise and fall of a hero or anti-hero and a civil war (combined with elements of fascism if you like) were hardly new concepts when JMS used them. But then, what is? Most if not all stories have been told in some form or another in the past. It's how they're reinvented and updated that keeps them fresh. At least, that's my 2 cents.
well, yes the concepts of civil war and hero falling etc, are not new at all. I guess I was referring to the execution and style. I mean Londo really was comic relief then he really did horrible things and there really isn't a happy ending for him.
He turned his life around to be a mostly good guy by season 4 but the bad guys basically forced him to "be evil" again.
Anyway, very complicated and layered tragic story that I have never seen anything else come close to.