Claus

Claus is a character exclusive to the 2003 anime, who lives in a village that the Elric brothers visit at the start of the anime during Edward's flashback. When they first meet her, she is rude and acts like a tomboy who wishes to avenge her sister's death after she was killed by one of the Karin zombies. However, after being saved by the Elrics from Majhal's evil scheme who tries to use her as a sacrifice to bring back the real Karin, Claus warms up to the Elric brothers and became more feminine, something that shocked both Ed and Al as they originally thought she was a boy.