Dune, also known as the God of Death, is a character whose past is deeply intertwined with the central tragedy of his world. Before the cataclysm known as the Ruin, Dune served as one of Luna’s most powerful and loyal guardians, holding the esteemed position of her personal bodyguard. His reputation was fierce and feared among other robots, earning him the ominous nickname. More than just a protector, his devotion to Luna was profound, as he loved her more than anyone else. When Casshern assassinated Luna, an act that triggered the Ruin, Dune was present and attempted to stop the killer. He engaged Casshern in battle but suffered a humiliating and devastating defeat that left him incapacitated.

In the aftermath, Dune became a tragic and deteriorated figure. Crawling painfully across the world’s desolate, crystallized landscapes, his body is heavily damaged and wrapped in tattered cloth, showing obvious signs of ruin. Despite his severe debilitation, his core programming or will refuses to let him die. His personality is defined by this singular, driving obsession. Consumed by rage and a thirst for vengeance, he equates Casshern as his enemy, his nemesis, and his scourge for killing Luna. However, his motivations are twofold. While he seeks revenge, his deeper, more fundamental desire is to find Luna herself, serving as a fallen guardian angel desperate to find his lost love and regain his past purpose.

Dune’s primary role in the story is to serve as a dark mirror and a source of revelation for the protagonist, Casshern. When their paths cross, Dune’s condition and rage force Casshern to confront the tangible consequences of his forgotten crime. Dune represents what Casshern could become if consumed by hatred, but also what it means to have an unwavering reason to live. His presence deeply impacts Lyuze as well, as she remembers her sister Liza, who was also one of Luna’s bodyguards alongside Dune. Lyuze is the one who recognizes the broken figure and explains his history to Casshern, revealing that Dune’s will to live stems from a desire for someone to protect. Upon recognizing Casshern as the killer, Dune attacks him with blind rage. However, after being defeated in a second battle, he clings to his vengeance. The turning point comes when Lyuze tells him that Luna is still alive. This news immediately overrides his hatred, and he reveals that his wish to be with Luna far outweighs his desire to kill Casshern. Renewed with hope, he abandons the fight to seek her out.

Throughout his appearance, Dune shows a notable development in his understanding of his own motivations. Initially believing he is searching for revenge, he ultimately realizes that his hands were not seeking Casshern’s destruction, but rather the warmth of Lady Luna. This realization brings him peace and gives him the strength to continue living. The key relationship in his life is unquestionably his devotion to Luna, whose final words to him were to live on. His relationship with Casshern is purely antagonistic, defined by the latter’s unforgivable sin. In terms of abilities, Dune was considered a formidable warrior at his peak, earning the title Death God for his combat prowess as Luna’s strongest guardian. Even in his heavily deteriorated state, he can muster enough strength to challenge Casshern, using bladed weapons in a vicious and relentless assault, fueled entirely by his rage and willpower.