Revy does most of the fighting for the Lagoon Company. Very little is revealed about her past, although portions can be pieced together through the series. Revy is a Chinese-American born and raised in Chinatown, Manhattan, near Mott Street, spending most of her youth as a thief and murderer. Flashbacks throughout the series reveal that Revy may have honed her skills with firearms by shooting at cans, and that her first murder may have involved shooting an unknown man while using a pillow. It is unknown whether the pillow was used to suppress the noise or to help avoid looking at her first victim. Revy is very competitive, easily bored, and extremely ill-tempered. Unlike Rock, she is undiplomatic, believing in the use of brute force and coercion to get her way. In contrast to this, she's revealed to be highly ticklish.

A red haired Britannian-Japanese who believes herself to be a Japanese person at heart and prefers her birth name, Kallen Kouzuki, over that of her father's prestigious family. She maintains the image of a frail, outstanding student at Ashford Academy, all the while being a member of the Japanese resistance movement and is Zero's most devoted follower.