Babiru (バビル Babiru) and Seiu Ou (汪・青宇 Ō Seiu) are an ancient mamodo team who fights along Ibaris, usually. Their spells are based on Energy. Babiru eyes are never seen; and Seiu is his brainwashed bookkeeper. When first introduced, Babiru was helping a team of ancient mamodo to burn Baransha's book. They're too last seen in the ancient battle, when Brago burns all ancient mamodo books (including his book). Seiu's japanese voice is unknown.
After the forest incident, Babiru is later seen with Ibaris, again, protecting the Devolo ruins of any intruder; but both are defeated. He is last seen in the final ancient mamodo battle, helping Ibaris to defeat Brago, who burn all ancient mamodo' books easly.