Vasha Pupkin recruits individuals such as Akira Ihotsu into the Trade Federation's orbital drop infantry, units nicknamed "Yakitori" for their expendable nature and high casualties. His responsibilities include assembling Unit K321 from misfit soldiers across nations for deployment in Federation operations.

Pupkin operates under the designation "cook," reflecting his role in preparing and supplying human soldiers as disposable assets. During the mission to Barka, anticipating unrest from exploitative trade negotiations, he equips Unit K321 with actual weapons while other units receive ceremonial gear.

Following Unit K321's involvement in an orbital bombardment devastating Barka, Pupkin appears as a prosecution witness at their genocide trial, suggesting betrayal. However, his testimony and prior coordination with defense attorneys reveal a calculated strategy to exploit the Federation's legal framework. By emphasizing the unit's classification as military equipment rather than trained personnel, he facilitates their acquittal and shifts blame to the Trade Federation's diplomatic corps.

His recruitment and management of Unit K321 serve Program Mariana, an experimental initiative Pupkin conceived to enhance human combat effectiveness. Recognizing standard neural implant training as unsuitable for humans, he advocated for traditional methods. Unit K321 became the program's test subjects, undergoing rigorous drills under instructor John Do to develop teamwork without implants. Their survival and cohesion validated this approach.

The character's name derives from "Vasya Pupkin," a Russian internet meme historically representing an abstract or negatively connotated everyman figure, often implying social inferiority or scapegoating.