I think that a good feature to include to Discourse would be to import your profile (with images, settings, etc.) from other communities.
For example, I’m an user of Thunkable Community - http://community.thunkable.com, and now I’ve registered in Meta Community, but I don’t want to reconfigure my profile because I’m a lazy person, or I have no time. How could I import my profile?
A suggestion for this feature could be to download a .json file and upload it in your preferences screen, so your profile data will be loaded