What are any ponies fhat are important to you, but you wouldn't really say are your "favorite"?
For example, my favorite ponies are G1 Chief, G3 Waterfire, and G1/G4 Applejack, but I'd say that G1 Firefly is my hero, G2 Skyskimmer was my first pony, G1 Cutiesaurus is my holy grail, etc.
What about you? Do you have a hero, a first, a crush, an avatar, kin, ideal friend, leader of your herd, etc. that you don't really attach the word "favorite" to?