Principal Cinch, the head of Crystal Prep Academy, a character who appears in My Little Pony Equestria Girls: Friendship Games; could she make an appearance as an Equestria pony in My Little Pony Friendship is Magic in season 6?

In other words, a villain in the same mold as Lord Tirek, Queen Chrysalis, and King Sombra as well as the previous evil incarnations of Princess Luna (as Nightmare Moon), Starlight Glimmer (when she was still leader of Our Town), and Discord (in the episodes The Return of Harmony Part 1 and The Return of Harmony Part 2).

I could imagine Cinch as an evil female unicorn with dark magic, more evil than her human version.

Or, in another version of Cinch as the evil villain, she is a Draconequus, a female counterpart of Discord who like him hails from the dimension of Chaosville.