|Hair Color||Blue with red highlights|
|Affiliation||Demon Lord Faction|
|Light Novel||Volume 4|
|Voice Actor||Anzai Chika|
Fio (フィオ Phio) is a soldier of the Demon Lord Faction. He first encountered Jin Toujou, while Leohart and Jin were fighting at Lundvall castle. The confusion of the battle resulted in Fio's allegiances getting questioned. He then decided to follow Jin and help him in his quest to look for Sapphire, until the political situation in the demon world worked itself out.