This question is not answerable, as it is difficult to measure how much each character in a show is liked worldwide.
According to various polls, Twilight Sparkle is the most popular pony in My Little Pony: Friendship is Magic.
Raindow dash
Popular pony toys among people include several. The by far most popular of them altogether is My Little Pony, in which has thousands of toys available to buy. Some other brands include the popular Hansa brand of hand-made pony toys.
My Little Pony, My Little Pony, All in a twinkling, Spring is here. My Little Pony, My Little Pony, When did all the leaves and grass appear? Where there were snowdrifts, Now there are no drifts, Nor is the sky overcast! My Little Pony, My Little Pony, Winter is over at last! My Little Pony, My Little Pony, Frisking about as spring unfolds. My Little Pony, My Little Pony, Breathing in the scent of marigolds. Greeting the bluebirds, Welcoming new birds, Romping through meadow and wood! My Little Pony, My Little Pony, Winter is over for good! Source: http://mylittlewiki.org/wiki/G1_Music
The My Little Pony series originated from Hasbro toys call My Little Pony. The first animated series called My Little Pony Tales premiered in 1992. The most recent series is called My Little Pony: Friendship is Magic.
The shetland
Probably the Quarter Horse and for the pony's probably the Shetland pony
There is a DeviantArt page that most people will make their pony oc (original character) on. I'd check that out if I were you, because apparently it's pretty popular: http://generalzoi.deviantart.com/art/Pony-Creator-Full-Version-254295904
the pirate101 and wizard101 are most popular virtual world!
Military
Amoxicillin
Apple