I am! (A little belatedly.) Any ideas on how it should be organized?

I was thinking by which books are centered around them, for instance even though Elspeth shows up in the Arrows trilogy, the Mage Wings trilogy is pretty much 'her' series, so she'd go there, and There'd be a note in the other section indicating her where hers is.

Another possibility is by nationality (Valdemarans and Heralds one section, Kaled-a-in in another section, etc.). Hmm, I don't know, what do you think?

I think by trilogy is probably the best bet. There'll be overlap, but generally each trilogy has its own main cast. I think it'd be a little unwieldy to lump by nationality, given the sheer number of characters involved (and with supporting characters in some of the books, nationality isn't necessarily specified; in other cases it's simply non-intuitive, as in the case of Kethry, who is technically Shin'a'in by adoption but would readers really think to look for her in that section?). Also, not organizing by work means having to move back and forth to and from different sections to read about the cast of a specific work, which seems counterintuitive - I noticed that you've started by setting up separate pages for Valdemarans, Kaled'a'in, etc, but that means that, for example, to read about the cast of The Mage Winds I'd have to go to and from all three pages. It seems like they should be on a page together.