Sadao Kujo

is a minor character featured in the third part of JoJo's Bizarre Adventure, Stardust Crusaders. He is the father of Jotaro Kujo and husband of Holy Kujo. As a famous jazz musician, he is always on tour and is never seen in the series.

Summary
Sadao never actually makes an appearance in the series and is only mentioned on the Joestar Family Tree. In the story, only his name and occupation are given.

He seems to be disliked by his father-in-law Joseph Joestar, as Joseph starts disliking Japanese people after Holy marries Sadao and moves to Japan.

Stardust Crusaders
Sadao married Holy Kujo, the only daughter of Joseph Joestar. After Holy moved to Japan, they had their son, Jotaro Kujo. Leaving his family to travel around the world as a famous Jazz musician, Sadao was not present during the events of Part 3.

Trivia

 * In Japanese, the sada (貞) part of Sadao's name can also be read as jō, making him one of the few JoJos in the series who are not direct descendants of the Joestar Bloodline.