When the Anime EVANGELION 2.22 will soon release on May 26 2010. The cosplayer was spotted outside the Akihabara branch (in Japan) of top anime store. I found this after 3 months later, very late...= =
I lookup her information and finally I knew her name is ちゃまろ (Chamaro). If you want to know her more information, you can search: chamoLOG. Of course you must know Japanese, I don't understand Japanese language too... = w ="