A quick googling later tells me that Elric of Melnibourne, The White Wolf, inspired the names of White Wolf, Inc as well as Geralt of Rivia's nickname! I've been educated!
Mine just struck me as a cute image. It works on a few levels, but the book and quill turned into a tabard seemed an appropriate mascot for a gaming situation.
I had no avatar for months before realising I was the only one who didn't .. So I picked a transmutation circle from Full Metal Alchemist Brotherhood, a show that I started watching years ago but only recently got around to finishing. No special significance, just liked how it looked!
My picture is of Volibear: The Thunder's Roar. He's a LoL Champion, and a pretty awesome one at that if you like armored bears. Which I do, a lot. He's also a fair bit like me personality-wise, and he's really powerful. I was also in a sort of homemade RPG at the time I found GP in which we picked characters from popular media as our characters, and I was Volibear in that, so when I came here I just kept it. He's also my favorite League champion, though Nocturne is a close second.