As Elderly, he is voiced by William Frederick Knight and as young, he is voiced by Keith Silverstein.
It is said that he plays pranks on humans, but he doesn't really hate them - rather, he doesn't believe humans should interfere in yōkai affairs. He dislikes the fact that Rikuo goes to school and acts human but respects his grandson's wishes.
400 years ago, he fell in love with Yohime and fought Hagoromo Gitsune in Kyoto when she kidnapped Yohime just to eat her liver. At first things looked grim for Nurarihyon, but he was eventually able to harm Hagoromo Gitsune's host body and save Yohime when Hagoromo Gitsune fled. They then clashed a second time on the roof, fighting to a stalemate. The arrival of Hidemoto Keikain tipped the balance in Nurarihyon's favor. Hagoromo Gitsune was sealed away by Hidemoto but the damage she caused to Nurarihyon during their battle caused Nurarihyon's life span to decrease.
Even in his old age, he can easily beat "Night" Rikuo and Muchi. Normal yōkai feel so much "Fear" that he is invisible to them until he strikes, that is his "Shin Meikyō Shisui". He appears during the final battle with Hagoromo Gitsune in Kyoto and assists Rikuo. After returning from Kyoto, Nurarihyon officially retires as leader and commander of the Nura Clan, allowing his grandson Rikuo to succeed him.