Sixty years ago, a 14 year old Z enlisted in the Marines, desiring to become a hero. He eventually participated in his first battle four years later, in the
G-5 Division
[6]. At age 28, Z realized that the Marines are not always heroes. Six years later, Z had mastered Busoshoku Haki. For this reason, he received the epithet "Black Arm".
Z became an admiral at age 38, during
Gol D. Roger and
Edward Newgate's golden age. By this time, he had become very popular with his subordinates. He got married, and a year later, his son was born.
Z's happiness was ended prematurely when a pirate murdered his wife and son three years later. Z wanted to resign from the Marines, but he was eventually persuaded to stay as an instructor. He trained many cadets, most of whom would ascend the Marines bureaucracy in both power and status.
Twenty-three years after the death of his loved ones, Z's arm was cut off by a pirate who had a Devil Fruit power, and his entire division was massacred with only Ain and Binz surviving. At age 70, Z received his
mechanical arm from a government scientist and began hunting down pirates with Devil Fruit powers.