Kojima, an older man with a gruff exterior, speaks bluntly, often appearing abrasive. Yet beneath this rough surface lies a kind heart and fierce loyalty directed towards Shocker-san and their friends. While his background remains largely undefined, hints suggest possible involvement in past shady dealings. A regular fixture at Shocker-san's restaurant, he eats, drinks, and serves as a sounding board, offering crucial advice. His deepest bond is with Shocker-san, whom he regards with profound, father-like respect. Kojima's loyalty faces tests across multiple episodes, but he consistently proves a steadfast ally, prioritizing harmony and providing pragmatic support to maintain stability in his relationships. He appears in all 50 series episodes and the movie *Shocker During the Day: THE Movie*, reinforcing his supportive nature during others' challenges without significant alterations to his background or personality.