Kunzite

A machine with a heart, he is a mechnical guardian knight that was operating more than 2000 years ago. Created to protect Richea, he has a heartless-looking face and doesn't choose any means to reach that goal. At the beggining of the game he is found abandoned an not functioning on an enemy base, after fighting the boss, he appears to help you escape. Later on, after you exit the sewers, He discovers that Shing caused Kohak's Spirune to shatter to pieces, he grabs kohak and threatens to kill Shing, after the fight. Kohak explains it wasn't really Shings fault, Kunzite agrees to continue traveling with you to recover all of her Spirune. He possesses the Soma "Vex"

He develops a strong Rivalry (Later friendship) with Hisui Hearts, and a strong bond with Richea