I'm relatively new to MLP collecting. I mostly collect Princess Luna and Nightmare Moon. I think I have most of the U.S release Princess Luna figures. If anyone has a list of what's available or a photo of a Luna/Nightmare Moon collection, I'd love to see. I also love Zecora, the Cutie Mark Crusaders, and Big Macintosh. And, I don't believe she's been introduced in any G4 merchandise, but I love Toola Roola (if anyone has any pics of merchandise of her...I'd love to see that as well).
I just found out about this site after working out a MLP: FiM trading card trade through Livejournal. I'm really excited to start trading cards here.
That has become my primary collection...even though I do also collect some brushable figures (my most notable one being the SDCC Derpy) and blind bag ponies.