Was just reminded of something I was intending to mention yesterday except I got wrapped up in the reviews and was ridiculously tired (because I stayed up until nearly 3am reading them, whoops, ha ha), but you were (at one point) musing about why on earth Londo's credit was after Vir's, despite Londo being the more major character? It's because it's extra prestige to be the "with..." or the "and..." in the credits. I have no idea why, but there it is. It's a perk kind of thing that gets negotiated in your contract along with your pay.

For Peter Jurassik and Andreas Katsulas, in order to basically keep things equal between the two actors, they swapped out who was the "with" and who was the "and" each season. If you look at the opening credits for each season in order, they alternate who is where each season, which I think is neat.