Pinkie Pie is on the loose, unsafe at any rate of speed. Even Twilight Sparkle gave up on explaining who or what she is. Wisely; after what she went through, in her vain efforts.

Wise beyond ages and incapable of forgetting, Pinkie is trotting through life in her blissfully ignorant manner.

Dr. Pi is the Pony who seems to be an Earth Pony, but then have more magic than the average Unicorn, and fly more and better than the average Pegasus on the street.

With the entire of Equestria as her Friendship Farm; she is quite the resourceful young mare.

Just like Madam Pinkie sees the future; never to be letting on, or telling you the full picture; when she could feed you the tantalizing image to tease your curiosity.

Of course, there is a Changeling and a Transformer in the town of Ponyville.