Well for our favourite villain it would be either Queen Chrysalis or Nightmare moon (me!)
And for background pony... hmm... that's a hard one... It would have to be Octavia Melody, as she has a really pretty mane and name.
She also produces great music and your princess of the night loves music almost as much as she loves video games.Thanks klnightgirl for this suggestion 😋
Also, don't hesitate to ask more than one question and it shall be answered!