Kreuz, Fia

フェア・クロイツ

Initially recognized solely as "Father" by Teito, he brought Teito into a church and brought him up. During Teito's childhood, he instructed him in numerous matters, encompassing most of the church's texts. Fia Kreuz was expelled from the Church soon after Teito departed, due to fleeing with Pandora's Box.
He held deep affection for Teito, having reared him and serving as his main paternal figure. He is in fact the King's younger sibling, which makes him Teito's uncle by blood. Despite the many contrasts between him and Frau, Teito frequently recalls Kreuz when Frau displays seriousness.
Fia Kreuz is also one of the 07-Ghosts, specifically Vertrag.