Zenon Żebrowski operates as a Gards-orm pilot within the Gardege weapon system, his face obscured by a helmet during early encounters. He moves with silent, lethal focus, driven solely by vengeance for his sister Lienne Żebrowska's death in the human-Gards-orm conflict. This purpose cements his role as a primary antagonist.

After clashing with Kyo Sogoru, Zenon forges an intense rivalry fixated on overpowering Kyo to assert dominance and fulfill his vendetta. This obsession fuels his aggressive tactics and relentless pursuit across battles.

Undergoing evolution into a Perfect Server, Zenon gains enhanced physical traits distinctive to evolved Gards-orm members and significantly heightened combat abilities. Now piloting advanced Gardege variants, he repeatedly challenges Kyo and allies in brutal confrontations, pushing them to their limits through ruthless strategy.

As the conflict escalates, Zenon’s singular focus on defeating Kyo intensifies, positioning him as a persistent, formidable adversary in major clashes against the protagonists. His arc culminates in a final showdown against Kyo Sogoru—the apex of their rivalry and Zenon’s quest for retribution.