An agathion is a familiar spirit which appears only at midday in the shape of a human or an animal, or even within a talisman, bottle or magic ring.
- Devil Children: Book of Dark
- Devil Children: Book of Light
- Devil Summoner: Raidou Kuzunoha vs. The Soulless Army: Volt Class
- Devil Summoner: Raidou Kuzunoha vs. King Abaddon: Volt Class