Name: Mia Koji
YST Name: Naste (or Nasuti) Yagyu
Hair: Brown (Looks reddish)
Eyes: Green
Height: 5'3 feet
Weight: 125 pounds
Birthdates: May 15, 1970 and May 28, 1970. (This was due to an error made by the creators at Sunrise.
Birthplace: Canada. Born to a French mother and a Japanese father.
Mia Koji is the first female friend of the Ronins and the official babysitter for Yuli, having taken him under her care when his parents were captured by the Dynasty.
She teached at the University and is a researcher of Mystical armor and legends, of which she also teaches. She first sees Ryo during a newsbroadcast and rushes out to retrieve him, knowing that Talpa was getting close. At the same time, the Dynasty struck its first attack and she saved Yuli from being crushed from falling concrete.
When all five of the Ronins appear to fight against their first opponent, a talking Dynasty soldier, she uses her knowledge of the Dynasty to help them. She is then captured along with Yuli and is used as a hostage against them until Ryo manages to find a way to save them both.
It can be said that Mia's intelligence could rival Rowen's, but she has a temper and is stubborn to boot, doing whatever she can to help the Ronins even at the risk of her own life. Her stubbornness and determination are what help get her through the Dynasty wars, giving her the courage to stand up against the face of danger. She displays this courage by using herself as bait to lure Cale, the Dark Warlord of Corruption and Darkness away to help Sage find Kento.