Shion Uzuki is the main character of the Xenosaga series. She is the head of the project that developed the anti-Gnosis android KOS-MOS. Though KOS-MOS is an android, Shion treats her like a person. She has one brother, Jin Uzuki, who is much more of a traditionalist; a trait she sees as silly. Though Shion is a generally kind and upbeat individual, she lived through some traumatic experiences as a child that turned out to be far more significant than she could have ever realized they would be.