Lion navigates corporate life as a middle-management office worker in a world of anthropomorphic animals. His large size and species-typical features create an imposing, often intimidating presence that starkly contrasts his fundamentally gentle nature. He remains consistently portrayed as warm-hearted, humble, and hard-working, embodying this central contradiction.

He acts as a senpai to colleagues Lizard and Toucan, striving to uphold professionalism and stability amid workplace chaos. His management style reflects patience and kindness, though he sometimes grapples with the irresponsible actions of those around him, particularly Toucan's antics. He typically performs his duties wearing a gray suit.

Within his family life, Lion is a father to his daughter Shishimura. He actively participates in her school events, such as a mascot character presentation where he interacts with her friend Gorimi. This nurturing parental role further emphasizes the contrast with his intimidating exterior.

Specific incidents illuminate Lion's traits and vulnerabilities. During a dental appointment, involuntary reactions when agitated cause him to bite down on the dentist's head, revealing the tension between his animal instincts and workplace civility. He also avoids a blood drive, citing an aversion to blood. However, this stems from a fear of needles, as he remains unfazed by violent media or the sight of his colleague Lizard's bleeding, detached tail, which he dismisses as Lizard's "default state."

Lion's work involves navigating demands from his superior, President Turtle, who exhibits exploitative tendencies towards employees. Despite this challenging environment, Lion perseveres, working diligently to fulfill responsibilities while mitigating his coworkers' erratic behavior. His relationship with Toucan and Lizard involves elements of camaraderie, frequently tested by their actions.