I would say enter Shining Armor and Cadence together create a 7th Element, the element of Love. They already have them and their personalities haven't been developed by much so they can be molded into characters that will complement the other six as well as allow for some much needed wiggle room to create stories for the show (i.e. Crystal Kingdom adventures, more into Twilight and Shining's personal/family lives, a look into the Alicorns ecology{Celestia, Luna, and Cadence could get a shared episode}, as well as allow the characters {old and new} to journey around Ponyville, Canterlot, Everfree, and new places made for Crystal Empire.)

And if you want something stupid instead give Sisby/Wildfire a shot. Make her Spitfire's sister or something and she could be very pushy and always want to take charge when its her friends but when with strangers she is timid and tries to make sure others like her. Give her the element of Arson or Courage. Dealer's choice.

Scoots wrote the list and there were quite a few spanish words so is it possible that she is Hispanic?

Meh...

Interesting...

Hmm...