Keiko Ukimura
Keiko is a straight A student at her high school and a close, very close friend with Yusuke. She has also been attacked by nearly every monster that the crew has faced, including Hiei (before he joined Yusuke), and the Saint Beasts' Infected People.She does find out about the Spirit Detective stuff and tells Yusuke that she wants to know why she was never told her any of this before.