It isn't a job title. It probably is a street handle, not the name his parents gave him, but one should keep in mind that 25th-century Diqiu gangbangers are not likely to be familiar with the military history of 20th-century Japan, and as such, he probably did not name himself after a World War II suicide torpedo. That is, it's a meta-reference, not one that has significance inside the story.

--G.
-><-
Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
Eyrie Productions, Unlimited http://www.eyrie-productions.com/
zgryphon at that email service Google has
Ceterum censeo Carthaginem esse delendam.