Diedrich Kreizen Agaha

Diedrich Kreizen Agaha (ディードリッヒ・クレイツェン・アガハ, Dīdorihhi Kureitsuen Agaha) is a prophet and the Sword Emperor who reigns over Dragon King's Country Agaha, the land of knights.

Nafta
The two fall in love, making a vow not unlike marriage by the end of the volume.