There is a recent post about this under "talk", but I would like to offer the following suggestion for the arrangement of characters pictured on the home page.
1> The criteria for appearing in a picture on the home page should be the characters corresponding to the actors listed in the opening credits of either the current season or most recently completed season, whichever is more practical. This would head off debate as to which characters deserve to appear there.
2> Only two categories would seem to be necessary at this point, "Crawley Family" or "The Crawleys and Family" and "The Servants" (would "The Help" be too American?). I see that David Robb (Dr. Clarkson) appears in the opening credits for season 4, which would present a minor problem.
Then have each category header link to pages for comprehensive listings of characters by category, in turn linking to the respective character pages. At least two additional categories could have links on the home page "Recurring Characters" and "Deceased or Departed Characters".
This would have the added benefit of making it a little easier to navigate to at least the regular characters.