For me it was conspirshipping. or Yami Bakura/Ryou/Marik/Malik the most interesting is metteshipping (I think thats what it's called. But it has aymi, yugi,Ryou,Mali,Marik,and Bkura. It like everyone decided to jump in bed together. Fun to try and write it though.lol
I have no original favorite. When I learned what Yaoi was anything with Yami(should I call him atem, his real name, or yami?) and/ or Yugi immediately came to mind. Right now I really like AtemxYugi. whee