Benny Delon

Benny Delon is a famous serial killer who lived about 100 years prior to the beginning of Hunter × Hunter.

Background
Every time he killed someone he made a knife engraved with a number and called it Benz. He then sold the knife in his shop like other normal knives and swords. A total of 288 Benz Knives were made. "The cries and expressions of the victims give me inspiration," he said in a book he wrote in prison.

Hunter Exam arc
Benny is mentioned during the Trick Tower part of the 287th Hunter Exam.

Yorknew City arc
Gon and Killua found one of the Benz knives in Bull Market in Yorknew City. And later, Chrollo Lucilfer used a Benz Knife to cut through the skin of Silva Zoldyck's left arm.