I think some of them are character models used in the official trailers for the Issues. They've been appearing and reappearing every so often in pop-ups like this and for some of the booster packs, too.
Or they could just be various Dev-made characters that they play while testing out the stuff we haven't gotten yet.
Global - @El D
Servers - Protector
They're also now on the email I received for the 7 years, too many guest appearances for me. Are these maybe some of the Omega Team?
When using the NCSoft installer, there is a new picture for "Celebrating 7 years of super!" with a picture of Atlas Park and some familiar faces, like Statesman, Back Alley Brawler, Manticore, Positron, Numina.
Who are the other characters?