alright. if you want the most famous by the definition of famous, then that's gaga. i'm sure she'll find a way to materially murder me as soon as she reads this, but there's no contest here.
even when she is not playing, you wonder if she has a secret character or not, that you don't know about. when she does create a character, she has people wondering a) how long will last, and b) what she's up to next. either way, if she is playing, many will be monitoring her.
when she is playing and not just fooling with a character, whatever she does will cause an impact that others will follow later. when she was soldier l8dygaga, #1 in mobility & hiding, many would switch to mobility. when she was builder l8dygaga, #2 in strength & hp, a lot of players would beef up and become mini-tanks. she did way too many things as goldenarrow to list, and started the hp trend on .net servers. then, she returned as a level 53 dueler who finished the raid, the art thief & the golden gun quests in 2 weeks, and made duelers the IT class in fort fighting. recently, she was this level 1 greenhorn throwing pebbles in a fort attack, killing 3 and getting +5k damage during the stacking phase.
what i'm saying is that nobody would deny how great the other players were or have been on w12. but none of them will keep everybody talking, guessing and/or wondering all the time about what they did, what they've done or what they may or may not do in the future. controversial or awesome, as everything she does, only gaga can cause that effect and make it last for one and a half year.