Atsushi Yadomi, the widowed husband of Tōko Yadomi and father of Jinta "Jintan" Yadomi, assumed sole responsibility for raising his son after Tōko's death from an unspecified illness. He possesses grey hair, ochre eyes, and a black goatee, typically seen wearing a multicolored zig-zag patterned beanie and a yellow button-up shirt. Atsushi exhibits a gentle, permissive parenting style, frequently using the word "kawaii" (cute) to describe endearing things, including Jinta. While outwardly adopting a laissez-faire approach toward his son's reclusive lifestyle and school absenteeism, he privately maintains an accurate awareness of Jinta's activities and well-being. This leniency stems from his belief in granting children significant freedom, though it inadvertently contributes to Jinta's struggles as a hikikomori. Jinta occasionally expresses a wish for more paternal structure. His character reflects unresolved grief over Tōko's death, which influences his reluctance to pressure Jinta. Despite his seemingly detached demeanor, he harbors deep concern for his son, evidenced by discreet monitoring of Jinta's life. Atsushi's backstory reveals Tōko once made steamed raisin bread for the Super Peace Busters, and Menma had promised her to "make Jinta cry"—a commitment later fulfilled when Jinta processes his suppressed emotions. In broader narratives, Atsushi functions as a secondary figure whose interactions emphasize the lingering impact of loss on familial bonds. His relationship with Jinta subtly evolves as Jinta gradually reengages with society. Atsushi's core traits—leniency, observational concern, and verbal quirks—remain consistent across all adaptations, including the anime series, live-action special, and stage play.