Fritz K. Liddell, a bioengineering genius with blond hair and brown eyes, designed numerous machines for the Borgman project. His scientific expertise centered on developing advanced technology to combat extradimensional youma threats. However, he fundamentally disagreed with Memory Gene's decision to deploy his Borgman systems for direct combat. This philosophical conflict defined his stance within the project. Before his death, Liddell covertly pivoted his research to establish the Phantom SWAT, a specialized anti-youma task force. He believed this systematic, human-led approach offered a more effective defense strategy than relying solely on Borgman cyborg warriors, which he perceived as flawed. His relationship with Memory Gene extended beyond their professional collaboration, characterized as a love interest, adding complexity to their scientific disagreements. His legacy centers on the posthumous activation of Phantom SWAT, which became operational after his death to continue his mission using his designed framework. Concrete information about his specific activities or further development in subsequent official media beyond the original television series, such as films or OVAs, is not available in the provided sources.