Yotsuyu Yagiyama (八木山夜露 Yagiyama Yotsuyu) is a minor antagonist appearing in JoJolion.

He is an architect who worked on the Higashikata Family mansion and the baseball stadium where Aisho Dainenjiyama works.[3]

Yotsuyu is revealed to be a Rock Human with a stolen name, belonging to a Locacaca Organization. He attacks Josuke Higashikata in order to finish off Josuke's previous identity. Yotsuyu is a Stand User who wields the Stand I Am a Rock.

"OH, whos that, hmm?"
Yotsuyu notices you with Tsurugi boii <3