Of all Japanese actress I think Maki Horikita is perfect of Rei. Her role in Japanese dorama Nobuta Wo Produce - a silent, troubled young woman with very weird personality is much like Rei in the anime -- and don't get me started about physical attributes. Maki Horikita looks beautiful even in short hair.
Asuka is spoiled rotten kid but with issues too. I don't know who will play her. The Japanese public wants Erika Toda to play the part. Hmmm...she's a bad girl in Gal Circle. Maybe she can play the role.
Rei Ayanami - Bring Her To Life