It looks like the overlords at toy design are demanding a new pony join the main cast. Sales on Twi/Dash/Pinkie/ect are falling due to the fact that everyone already owns them. What better way to advertise than to add a new pony to the spotlight?
You have once again been summoned and thrown into the big kids chair with a document labeled "CHOOSE A NEW STAR CHARACTER" and a blank line. Unfortunately, you are limited to just background characters within the show due to budget constraints - they can't be dropping money on recoloring a new pony!
Pick your favorite, give them a 7th element of harmony, and decide on a personality!