Did you want physical descriptions, Matt? I've got character maps for a lot of them - a page for each that is covered in all sorts of information about the character. The big question is 'Where have I put them?' They are all in a folder somewhere, but I'm not sure where any more, as I finished writing about them some years ago. I would hate to write out detailed descriptions here and then find I'd given you something other than my original concept.
Characters definitely grow as the stories progress. A year can make big changes in a person - especially a young one. You only have to look at the difference in Andy Murray at Wimbledon this year to see that he has changed from gawky teenager into a man. The same would be true of some of my characters during the stories. Would you want how I originally saw them, or how they appeared by the end of the series? There would be a big difference in some cases.