I thought they forgot about Hitch in this kind of marketing. Every time it's a triop of ponies he's usually out of it!
We've got a new chart that lets you figure out which character you identify the best with out of these three. Unfortunately Zipp and Pipp aren't included, so hopefully we can figure that one out later. For now, at least you can play with these three.
Update: There is another quiz outside of this magazine article one now! It is available over on Hasbro's My Little Pony site and includes all the ponies. Find it here!