I would say derpy, but she is now cannon, or was. In my honest opinion, I would have to say Dr.Whooves, Colgate, Lyra, or Octavia.
This 'un is tough for me... Derpy is canon now I believe, iirc Hasbro said they would give her more speaking roles. Or maybe that was a rumour, I can't remember. And because of that, it has to be Octavia or Colgate. Brushie brushie brushie! :3
My heart exploded when Lyra got to say a sentence, brief though it was. Now I want to see Raindrops say a few words.
Ditzy Doo, secretive agent of the order. Hah! The canon name for this "Doctor Whooves" is Time Turner. Just sayin'. :derpe:
Between Vinyl Scratch & Derpy Whooves. Both are very liked ponies. Vinyl Scratch I like slightly more cause she is a music fanatic.
Derpy Hooves, Vinyl Scratch and Daring Do (Maybe she is side character...?) are my favourite background characters.
No Prob. But yeah hope we see some nice fan art of her in the future. After all Fiddle Sticks is best country music pony! XD.