When I first joined the Wyrmfang Chronicles, my character was Storinthalasin. Storin was a Silvanesti elven fighter/magic user from the world of Krynn. He was assisting his master with a magical experiment and it went horribly awry. He ended up in the misty realms of Ravenloft. There he wandered for several years before coming across the party of adventurers. Not having found his way back to his own world of Krynn, he threw in his lot with this band of heroes.
Hands down my number one all time favorite is 1st and 2nd edition Krynn. 2nd favorite is 2nd and 3/3.5e Forgotten Realms. I have to admit, though, that Pathfinder’s Golarion is starting to grow on me.