Based on where I *think* jms was taking the series, this is how the characters fall, most to least important:
In my own preference it's Galen, Gideon, Dureena, everyone else, and then Lochley would be dead last, but if the underlying story turned out to be
<table bgcolor=black><tr><td bgcolor=black><font size=1 color=white>Spoiler:</font></td></tr><tr><td><font size=2 color=black> a continuing Earth/Shadow/Drakh/Psicorps war criminal conspiracy where Gideon goes rogue and Lochley has to decide whose side she's on again (having been on the "wrong side" previously) with the subplot of "who are the mages, why do they have Shadowtech, whose side are they on really", as it appears, </font></td></tr></table>
that's how it shakes out. Of course looking at the first 13 episodes of B5 itself would give one a horribly skewed idea of what the show was going to be about, so this is probably way off.
Of course, Ivanova would be a far *better* Earthforce character for the above plotline than Lochley once you take into account the events described in one of the short stories.... hmmm.
Anyway, plot and characters aside, I think Chen could use a little help with incidental music (beneath conversations and the like) and the show could really have been promoted a whole lot better. Maybe they could do a MOW out of the two unproduced jms scripts, launching into a "Season 2" with any necessary cast changes. Buffy didn't do so badly with a 13-episode first season.