Professor Shikishima emerges as a recurring figure defined by his disfigured features, intricate history, and pivotal role in advancing Getter technology. His visage bears a crooked jaw, a bald crown fringed by graying hair, and a bulging right eye, marked by battle scars interlaced with metallic implants. Subsequent enhancements integrate weaponry and computer systems into his body, while his signature white lab coat perpetuates the mad scientist persona.

Once leading the Saotome Institute’s weapons division, Shikishima leveraged prior military expertise to spearhead the development of the Getter Robo and its armaments. Surviving the catastrophic Getter Ray explosion that obliterated the original machine, he aligned with survivors Ryoma Nagare and Hayato Jin before resuming his work at Saotome.

Later appointed director of the Asama Getter Museum, he exhibited a reconstructed Getter Robo to counter threats like the Dinosaur Empire, devising critical weaponry for these clashes. Re-emerging under Hayato Jin’s command with a cybernetically fortified form, he engineered defensive systems—missile arrays, security grids—for the Institute. A notable encounter with Takuma Nagare saw amusement when the youth claimed a handgun once wielded by his father.

Driven by an obsessive, death-defying zeal, Shikishima thrives as a maverick inventor, desiring an end intertwined with his creations. His closest alliance lies with Ryoma, collaborating relentlessly on weapon trials, indifferent to testing effects on human subjects—a testament to his ruthless dedication. Across timelines, his appearance, origins, and function remain unwavering, cementing his legacy as Getter technology’s foremost architect.