Manga
This the second character in both series. In this series, Sailor Mercury's name is Amy. Her japanese name is Mizuno Ami. She was born on September 20, thus she is a Virgo and has an A blood type.

Anime
This the second character in both series. In this series, Sailor Mercury's name is Amy. Since this is Anime, she has no japanese name. She was born on September 20, thus she is a Virgo and has an A blood type.

Amy's Website
www.sailormercury.com

As a last bit of information, Amy is always considered the "smart one". She always is top of her class.