One of the seven new God Warriors introduced in the series, and the second God Warrior to reveal himself. Considered the most vicious and cruel God Warrior, Fáfnir is willingly using anything or anyone to use in his experimentations, even humans. He is engaged by Mu before taking him for experimentation. However, it was already planned by Mu to gain knowledge about Yggdrasil which angers Fáfnir, forcing him to flee as Aiolia arrives.
He makes another appearance as he creates something special for Andreas (later revealed to be the new Odin Sapphires) as Aphrodite arrives and challenge the God Warrior, easily overpowering him with his roses. Being forced to reveal how to break Yggdrasil’s barrier, he is directly connected to Aphrodite’s mind by using a rose, allowing the Gold Saint to find out how to break the barrier. But Andreas arrives and handles Aphrodite in Fáfnir’s place. Fáfnir’s weapon is the sword Ridill, and it seems to have a resemblance similar to a dragon’s tail.
Fáfnir confronts Mu with his new Odin Sapphire in Svartalfheim before being comically beaten twice by Mu’s psychokinesis who has no time for chatting. But he reveals a stronger Cosmo and lash out at Mu, bragging about his powers. He later face the challenge and defeat at the hands of Deathmask’s God Cloth, left to suffer for all eternity in Yomotsu Hirasaka.