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Bluebon, alias the Blue Knight, is a shape-shifting robot forged by Dr. Los as a humanoid adult endowed with human-like emotions and appearance. Originally named Blue Bon, he was raised alongside sibling robots Maria and Tonto, whom Dr. Los regarded as family. After Count Burg—who initially masqueraded as a benefactor—brutally destroyed Maria and Tonto, Blue Bon’s grief spiraled into madness. He assaulted Burg’s estate in retaliation, only to be covertly reprogrammed by Dr. Los to mimic his deceased siblings, a modification that bred self-loathing and severed his bond with his creator. Concealed beneath armor and a helmet supplied by Los, he rebranded himself the Blue Knight, vowing to dismantle human oppression and forge a sovereign robot nation.

As the Blue Knight, he harbored animosity toward humans and their robot allies, though pragmatic alliances with Astro Boy occasionally emerged, particularly to shield robots from existential threats. During a clash with Burg, his armor shattered, exposing his shapeshifting abilities. Confronting Dr. Los after uncovering the truth of his alterations, the Knight grappled with remorse, intensified when Astro Boy sacrificed himself to save Los. This reckoning hinted at redemption, but Burg struck a fatal blow during his moment of vulnerability.

In *Astro Boy: Shinsen-gumi*, Blue Bon’s arc parallels this path: his rage against humanity ignites from their annihilation of his robotic family. A skirmish with Astro Boy erupts into chaos as General Lamp’s forces trigger a collapsing building. Shifting from foe to savior, Blue Bon sacrifices himself to uphold the structure, enabling others to flee. In his final exchange with Astro Boy, he tentatively acknowledges potential reconciliation between humans and robots before vanishing in an explosion.

The *Pluto* manga reenvisions him as Brau 1589, an incarcerated robot who murdered a human despite no detectable AI malfunction. A paradoxical figure, Brau assists investigators Gesicht and Atom in thwarting a supercomputer’s war-mongering schemes. He destroys the system’s creator, Dr. Roosevelt, with the spear lodged in his own body—a suicidal act cementing his enigmatic legacy of sacrifice and moral ambiguity.

The 2003 series diverges: here, he begins as Cobalt, a repair droid in a space wrestling arena. After revolting against human exploitation, he’s jettisoned into space, salvaged by the rogue Shadow, and rebuilt into a revolutionary leader. Renamed the Blue Knight, he founds Robotonia, a refuge for robots, and pursues a planetary haven for their autonomy—eschewing shape-shifting and familial bonds but retaining the core crusade against human subjugation.

Spanning iterations, Bluebon’s story weaves trauma, identity crises, and the quest for self-determination, frequently climaxing in self-sacrifice. His trajectory—from vengeance-driven insurgent to a figure glimpsing empathy—echoes themes of fractured redemption and the fraught interplay between humanity and artificial life.