OVA
Description
Kenji Murasame, also known as Kenji Murasame the Immortal, is a character who appears in the anime series Giant Robo: The Day the Earth Stood Still. His role and abilities in this story are a significant departure from his original depiction in other works by manga artist Mitsuteru Yokoyama, such as Tetsujin 28-go, where he is typically portrayed as a skilled but mortal secret agent or detective. Within the context of the Giant Robo OVA, Kenji is reimagined as one of the International Police Organization's top three agents, a distinction that arises from his most defining trait: immortality.

Kenji's personality is shaped by the burden of his unique condition. He is a pragmatic, morally complex individual who often appears world-weary and detached. His inability to die is not portrayed as a blessing but as a profound curse, as it forces him to endure the loss of friends and comrades while he remains, unable to join them. This eternal solitude compels him to keep an emotional distance from others, and he often serves as a sobering, almost tragic figure who represents the harsh realities of the conflict against the secret organization Big Fire. He is deeply cynical but also driven by a strong sense of duty and a willingness to use extreme methods, including deception and immense self-sacrifice, to achieve his goals.

His primary motivation in the story is to support the younger protagonist, Daisaku Kusama, and to fight against Big Fire. Kenji witnessed the murder of Daisaku's father, Dr. Kusama, and facilitated the transfer of Giant Robo's control device to the boy, thereby setting the plot in motion. He feels a heavy responsibility for Daisaku, treating the mission to end the war with Big Fire as a harsh lesson for the young man, who must come to terms with the consequences of wielding such immense power. His personal struggle is to find meaning in his endless existence, often channeling his abilities into selfless acts to protect others and ensure their sacrifices are not in vain.

Kenji holds a special, unspoken affection for his colleague Ginrei, whom he rescues on multiple occasions. The depth of his feeling is most dramatically demonstrated when he deliberately destroys an energy resonance field by overloading it with his own body, an act that reduces him to ashes, just to clear a path for her. His relationships with other characters are marked by his curse; he acts as a mentor and sobering influence on Daisaku, and his interactions are often tense due to his willingness to demonstrate his immortality in shocking ways. He has a noted rivalry with the powerful Chujo, as his unique power is of a different nature, yet one that allows him to stand on equal footing.

Throughout the series, Kenji's development is one of tragic resolve. He is already a fully formed immortal when the story begins, and his journey involves his repeated, seemingly hopeless attempts to tip the scales in the war against Big Fire. His most notable moment of development is his ultimate, self-sacrificing act to save Ginrei, an act that plays into the ambiguity of his curse. His regenerative abilities are so potent that he has survived events like the destruction of Paris, leaving his final fate open to interpretation, as even being burned to ashes may not be a permanent end for him. His background as a former Japanese intelligence officer in other Yokoyama stories provides a foundation for his tactical and espionage skills, which he employs alongside his immortality.

Kenji's notable abilities are centered on his immortality. He can survive any wound, including fatal gunshot wounds to the head, from which he can revive moments later. This makes him a nearly unstoppable agent who can use his own body as a strategic tool, often enduring massive trauma to achieve an objective. Beyond his curse, he is also incredibly fast, a master of disguise, and skilled in espionage tactics, reflecting his background as a top agent. In other versions of the character, he is known to be highly proficient with throwing knives and holds a personal aversion to using firearms, a principle stemming from his anti-war sentiments and a promise to his deceased brother.