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Description
Goshima is a character who appears as an antagonist in Shin Kamen Rider: Prologue. He serves as a loyal confidant and henchman to Iwao Himuro, the leader of the Institute of Super Science. His role in the narrative is that of a formidable enforcer sent to eliminate the protagonist.

In terms of his background, Goshima is a product of the same research program that created the film's central conflict. He is classified as a Cyborg Soldier Level 2. This is a distinct model of augmented human, contrasting with the Level 3 mutation that transforms the hero. While Level 3 involves genetic fusion and biological transformation, Goshima represents an earlier, mechanical approach to creating super-soldiers. His body has been heavily modified with cybernetic implants, requiring artificial skin to maintain a human appearance. This makes him a more traditional cyborg compared to the organic mutation of the protagonist.

Goshima's personality is largely defined by his complete obedience to his master. He acts as Himuro's right hand and carries out his orders without question or hesitation, displaying a cold and ruthless demeanor. His primary motivation is to serve the interests of the Institute of Super Science, specifically to eliminate the escaped test subject. He shows no mercy or complex personal ambitions, functioning as a relentless and terrifying weapon for the organization.

Within the story, Goshima is a significant physical threat. He is dispatched to deal with the protagonist and proves to be a dangerous opponent due to his enhanced capabilities. His most notable ability is his immense physical strength, which is far beyond that of a normal human. He is armed with a bladed claw on his right hand, a weapon strong enough to tear through concrete with ease, making him a lethal adversary in close combat. As an outdated but powerful cyborg model, he represents the established military might of the organization that the newer, more biologically unstable protagonist must overcome.

His key relationships are limited. He is directly subordinate to Iwao Himuro, acting as his personal enforcer. His sole mission in the film brings him into direct conflict with the protagonist, Shin Kazamatsuri. The encounter between Goshima and Shin culminates in a violent and decisive battle. In this final confrontation, the protagonist manages to decapitate the cyborg. In a final act of self-destruction, Goshima's severed head splits open to reveal a bomb which then detonates, completing his role as a disposable, yet powerful, asset of the Institute.

There is no significant character development for Goshima within the film; he serves as a static, imposing obstacle whose identity is entirely tied to his function as a cyborg soldier. His presence is meant to showcase the brutal world of cyborg warfare and the dangerous hierarchy of modified soldiers that the main character must confront.