Genba Ryougoku is a medical doctor operating a small clinic, serving as a steadfast ally and source of support for the protagonist, Saiga. His role in the narrative extends beyond a mere medical professional, as he is also an old acquaintance of Saiga's. Their connection is deeply rooted in a significant past event where Genba saved Saiga's life when the latter was on the brink of being crippled in a dilapidated and under-resourced hospital. This act of rescue establishes a profound sense of debt and loyalty that defines much of their relationship throughout the story.

Genba's personality is largely defined by his patient and grounded demeanor, a stark contrast to the chaotic and corrupt world surrounding him. His personal history has left a deep and unhealed wound, as his wife passed away from cancer only three months prior to the events of the series. This recent loss casts a shadow over his character, informing a quiet sorrow and a perhaps more jaded, weary outlook on life. Despite his own grief, he remains a reliable figure for Saiga, offering not just medical aid but also a safe haven and a listening ear.

His central motivation stems from this combination of personal history and professional ethics. He feels a strong obligation to Saiga due to saving his life previously, and he provides crucial assistance without hesitation. This assistance ranges from treating physical wounds to offering tactical support and a place to stay. Genba essentially acts as the grounded anchor for Saiga, representing the normal, decent world that the protagonist is fighting to protect. He is an information source and a moral sounding board, helping Saiga navigate the dangerous path he has chosen.

In terms of abilities, Genba Ryougoku is a highly competent and skilled surgeon and physician, running his own small medical clinic. His medical expertise is his most notable asset, proven by his ability to save Saiga from near-fatal injuries when other medical facilities had failed. Throughout the story, he consistently uses his medical knowledge to patch up the protagonists after their violent encounters, ensuring their survival. Beyond surgical skills, his character is also defined by his observational intelligence and his capacity for empathy, which allows him to provide psychological support to those who come to him. There is no information indicating he possesses any supernatural powers or special combat abilities, his strength lying entirely in his practical, life-saving skills and his unwavering loyalty.