Suggestion to have a Versatile badge for those who have good rep in multiple SE sites.
This is to recognize users active across sites - similar to the combined flair but a badge to go along with it.
This could be 3 tier
Bronze > 200 in at least 7 sites (or some similar threshold)
Silver > 1000 in 10 sites
Gold > 3000 in 10 sites
The badge would be awarded once per site, so if you qualify for Bronze you would get 7 badges at one shot. That might not be a good idea though, I admit.
The community at english.se have suggested the following titles
swiss-army knife, polymath, sage, Da Vinci, homo universalis, protean (Gold), multifaceted, all-rounder.
Though polymath has already been discussed earlier for Generalist