Age: 45
Affiliation: Konohagakure
Ninja Rank: jounin

Shinku Yuuhi is a shinobi from Konohagakure and father of Kurenai.

During the Nine-Tails' Attack on Konoha, Shinku was seen placing the young shinobi inside a barrier, informing them that they were to stay out of the fight against the Nine-Tailed Demon Fox, to which his daughter Kurenai voiced her discontentment. Shinku told his daughter that she was a shinobi who may or may not live a long life, and requested of her to live long enough to give him a grandchild whom the Will of Fire could be passed to.

(Source: Narutopedia, Naruto Wikia)