Music -- My life, I adore all kinds of music, nothing short of a fanatic when it comes to discussing that stuff
Pokemon -- My childhood, I grew up with the Gameboy Advance and Pokemon Emerald. Sorta explains my love for Sableye, too :P He was amazing in that game.
Yu-Gi-Oh -- I lost interest in it, because I have nobody to play with :(
Writing -- I've lacked inspiration to write stories for a while now, so I've taken it upon myself to write detailed character bios in the meantime.
Does Dueling Network give you freedom to create your own deck? Because I had to mod my savefile to actually have fun online in Millenium Duels Hard to make a proper deck without the cards needed