I only joined the arena (and properly got into MLP) late last year, but I love this place. I am fond of G1 and G4. My favorite pony overall is Rosedust.
I am also a fan of several things outside MLP: Sonic the Hedgehog, Power Rangers, The Railway Series/Thomas the Tank Engine & Friends (classic seasons), The Legend of Zelda, Lupin III, Speed Racer, and Pokemon, to name a few. I like mixing them together in various ways.
I have recently started and Ask A Pony tumblr, Ask Rosedust, which can be found here:
http://askrosedust.tumblr.com/