Anjuro Katagiri

Anjuro Katagiri (more often known as as Angelo) is an early antagonist appearing in Part IV: Diamond is Unbreakable.

History
Known as one of the biggest criminals in Japan, Angelo's is guilty of robbery and the rape and murder of three boys. After gaining his stand (presumably from Keicho Nijimura), he went on a killing spree, getting people to drink his watery stand before using it to cause their heads to be torn apart from within.

Diamond is Unbreakable
Shortly after killing Josuke's grandfather Ryohei, he attacked Jotaro and Josuke in Josuke's home, planning to kill them both on a rainy day and then to assault Josuke's mother.

He was eventually defeated and smashed to pieces by Crazy Diamond's fists into a rock. Josuke then restored him and the rock at the same time, fusing them and effectively turning Angelo into a hideous statue that becomes a historical landmark for Morioh.

Trivia
Angelo has an IQ of 160.