Tyrone Baxter is an American member of K321 Unit, nicknamed Yakitori, an orbital drop infantry group for the Pan-Star System Trade Federation. This multinational unit, composed of human recruits facing a 70% casualty rate on high-risk missions, includes Akira Ihotsu (Japan), Amalia Schulz (England), Erland Martonen (Sweden), and Zihan Yang (China).

Baxter is characterized by a consistently good-natured, easygoing, and positive attitude, frequently using phrases like "everything’s cool man" and "that’s awesome." He possesses significant strength, serving as one of the unit's primary combat assets. Under Commander John Doe, Baxter trains with his team at the Mars facility called the "Kitchen," focusing on teamwork and tactical coordination despite initial cohesion struggles.

Deployed to the planet Barka, Baxter fights indigenous insurgents alongside his unit and their AI support, Mimi. He participates in key combat operations, including a counterattack against a captured spider tank and an assault on an enemy artillery base. Following an orbital strike causing significant civilian casualties, K321 is scapegoated and put on trial. Legal proceedings classify the unit as military equipment, resulting in their acquittal.