Siegfried is a demon in the series. Siegfried is the dragon-slaying hero of the medieval German epic Das Nibelungenlied, most widely known due to its adaptation by Richard Wagner into a series of four operas, Der Ring des Nibelungen. The character of Siegfried and much of the plot of the medieval German epic originate from earlier Norse sagas, where the character is known as Sigurd. Sigurd was requested to slay Fafnir by Regin, his foster parent and guardian. Regin was the brother of Otr and...
