Random stuff you guys could do:
Aerith vs Tifa debate! *Hides*
Delving into opinion pieces, something like a 'Why I love...' series could work incredibly well, with people making passionate pleas / cases for say Cait Sith, or for a certain location, or a specific event in the game, etc... And you could even tie it into the Remake by discussing the potential possibilities that it could open up for that subject.
Speaking of the Remake, the winter news should be approaching soon, so some kind of video should be prepared right about now, and once the news does hit, you could quickly just edit in an intro (with whatever the news sparks) and then follow through with the rest of your subject matter.
Probably something more for the site but short Character Bios (like FF in a Minute) could help get some of the basics up and in place - and would work alongside the walkthrough being planned. Just a quick rundown about the character with perhaps a limit break compilation at the end.
Easy to do, and should draw some attention - Random Top 10 Vids (as chosen by the community on the forum). And you could have follow-up videos with what the viewers would have chosen (if you want to torture yourselves by delving through the YouTube comments).
I think Pixel brought up a neat idea ages ago somewhere about providing some simple animation for the Audiobooks. It would give it a different angle and would help target those that don't like to just sit and listen to stuff.