Nonna Zell was an Immanity, a human, who lived during the Great War that ravaged Disboard thousands of years before the events of the main series. She is the daughter of Ivan Zell and, after his death, was left in the care of Riku Dola. Nonna is the ancestor of Chlammy Zell, a character who appears in the later timeline. Physically, she is quite short and fair-skinned, with short black hair and navy blue irises with pink pupils, bearing many similarities to her descendant Chlammy. Her role in the story is as a member of the surviving human race during the war, seen as a child who must navigate the harsh, conflict-ridden world. Little is detailed about her personality, motivations, or any notable abilities beyond her survival and her familial connection. Her development is not extensively explored in available material, and she appears primarily as a supporting figure in the film No Game, No Life Zero.