Fafnir's (Daisuke Ono) human form resembles Sebastian Michaelis from Black Butler (2008). Both Fafnir and Sebastian are voiced by Ono.

Fafnir and Quetzalcoatl (Lucoa) are the names of mythological beings. Fafnir was a dragon in Norse mythology, and Quetzalcoatl was from Aztec mythology (though she was described as a feathered serpent rather than a dragon).

This was the last show Yasuhiro Takemoto served as Series Director on before his death in 2019.