TV-Series
Description
Oswald A. Lisker, alias Guyver II, served as a high-ranking Chronos Corporation inspector born into a prominent U.S. family with organizational ties. His father, Senator Robert P. Lisker, arranged his marriage to Astrid Forsberg of Chronos' Swedish branch, making Valkyria Forsberg Lisker his stepsister. Unlike his father's coldness toward Valkyria, Oswald acted as her supportive older brother. Trained for eventual Hyperzoanoid conversion, he rose within Chronos to Inspector rank.

Dispatched to Chronos Japan to retrieve stolen Guyver units, Lisker criticized Director Genzo Makishima's failures. During inspection of a damaged recovered unit, the bio-armor activated unexpectedly and forcibly bonded with him, transforming him into Guyver II. This fusion amplified his existing arrogance and ambition, compelling him to hunt the remaining Guyver units personally. He viewed the armor as his path to Chronos elite status and declared the world needed only one Guyver, vowing to eliminate the others.

His Hyperzoanoid combat training synergized with the Guyver's capabilities, rendering him a formidable opponent. He wielded the armor's weaponry—high-frequency blades, head beams, pressure cannons, and the mega-smasher particle cannon—with proficiency. However, the unit’s prior damage caused a critical flaw: unpredictable malfunctions in his forehead control medal. These triggered sudden mutations, temporary paralysis, and loss of armor control during combat, leaving him vulnerable. Despite this weakness, his skill overpowered Guyver I (Sho Fukamachi) and challenged Guyver III (Agito Makishima).

His pursuits led to repeated confrontations. He dominated Sho initially until a control medal malfunction enabled Sho’s escape. After witnessing Guyver I regenerate from apparent death, Lisker became convinced of his own immortality, heightening his arrogance. He betrayed and executed his defeated comrade, the Hyperzoanoid Zerbebuth, who pleaded for aid. During Chronos Japan headquarters’ self-destruction, he engaged Guyver III. Though Guyver III’s pressure cannon blasted him down multiple levels, he retaliated. He then confronted Sho again, disregarding the exploding base due to his perceived invincibility.

As he prepared to obliterate Sho with his mega-smasher, the damaged control medal malfunctioned catastrophically. Sho seized the opening, punching the medal from its socket. Without the medal to regulate it, the symbiotic armor consumed Lisker’s body. Despite his protests of invincibility, the unit rapidly disintegrated and devoured him. In the 1992 OVA, Guyver I vaporized the dissolving mass with a mega-smasher blast. In the 2005 TV series, Lisker melted into organic matter and perished in the base explosion unaided.

The live-action film featured a character named Lisker sharing only the name; this Zoanoid led an elite team, lacking Guyver bonding. The damaged-Guyver-host role was filled by Arlen Crane.

Lisker’s legacy resurfaced via his stepsister Valkyria. Using a flawed prototype control medal derived from his unit’s data, she became Guyver II-F. Partly driven by vengeance against Sho for Oswald’s death, she allied with Chronos commander Richard Guyot as an antagonist. Her unit imposed severe limitations—timed transformations and clothing destruction upon dismissal—accelerating her deterioration.