Kubota functions as an intelligence officer in the Japan Ground Self-Defense Forces. His established professional history with Daisuke Aramaki, forged during their prior collaboration as colleagues, designates him a confidential informant for Aramaki and Public Security Section 9.

Tasked with supplying critical intelligence from the highest echelons of the Japanese government, his information frequently proves instrumental in Section 9's investigations, particularly amid complex political and security crises. Kubota maneuvers within governmental circles, leveraging his access to sensitive data and internal developments.

His interactions typically involve discreet intelligence exchanges with Aramaki. These occur outside formal channels, underscoring the confidential nature of their relationship. Kubota's role remains consistent: providing timely and strategically valuable insights that aid Section 9 in navigating intricate governmental and military operations.

Across other Ghost in the Shell media, including films, OVAs, or spin-offs, no significant character development or expanded backstory beyond this professional capacity exists. His presence primarily facilitates Section 9's access to classified governmental information.