Kojima attributed Jennie as a subconscious inspiration for The Boss in Metal Gear Solid 3. He framed the opposition of Snake as a stray dog and The Boss as a mother cat in terms of his intention to introduce motherhood and the point of view of stray cats into a saga he had until then regarded as a story of parricide led by war dogs.
Thirty-three years after his youthful reading, Kojima took Jennie from his bookshelf again. Upon rereading it he discovered that the cat had influenced not only his view of women but also his creative work.
“The boss is kind of mysterious. She's maternal, but she's also like the father figure.”
When Kojima reread Shibumi in 2006 as part of his research for Metal Gear Solid 4, he was startled by parallels with ideas he had already used: a combat discipline similar to CQC, the heightened threat perception he learned in scout/tracking training, and the merciful murder of a parental figure, which he related to Big Boss and The Boss. His reappraisal led him to recommend the novel to the development team.
Kojima closed his essay by imagining his adolescent reading of Jennie as a dream in which he met a cat. An adult rereading made him realize he had never forgotten that experience and led him to correct his initial claim that he had never had a cat: in an intimate sense he had had Jennie and continued to carry her meme inside him.
Kojima said he entered high school unable to tell dogs from cats because he had never had either as a pet; not for lack of wanting one, but because his mother suffered from asthma. In his first summer of high school he picked Jennie by Paul Gallico despite not being a cat lover, and he suspected the title might have reminded him of Jaime Sommers from The Bionic Woman.