Kojindani is a high-ranking commander in the worldwide security organization WSO, directly overseeing the Skull Force military unit. An elderly man with long white hair and a beard, he typically wears a military uniform. His personality reflects a serious demeanor and a deep commitment to maintaining Earth's peace. This dedication occasionally drives him to bypass standard protocols, such as authorizing the release of top-secret intelligence on the Iron Kaiser to lower-ranked personnel like Tsubasa Yuki to counter critical threats.

During the Machine Island crisis, where an unstable Gravity Curtain endangered the planet, Kojindani issued the operational command for Skull Force's Death Caprice Squad to infiltrate the island and neutralize the gravitational anomaly. As the crisis escalated, he tracked developments from WSO headquarters and granted emergency information-sharing clearance to support field operatives tasked with disabling the destabilized Gravity Curtain systems.