The Community user on each site could use a customized Gravatar.
It shows up enough on
/questions?sort=active and edit histories that it's not an 'invisible' change, and may even make a difference in helping new users to understand, at a glance, what the heck it is.
Maybe something like this:
From a quick glance around, it looks like there's only two Gravatar accounts this needs to be changed on to take effect across all sites; email@example.com (
a007be5a61f6aa8f3e85ae2fc18dd66e), and firstname.lastname@example.org (