Tatsuo Kusakabe, a Tokyo-based archaeology professor, moves with his daughters Satsuki and Mei to a rural home near the hospital where his wife Yasuko receives prolonged treatment for an illness suggestive of tuberculosis. Balancing demanding city commutes with fatherhood, he returns late yet nurtures a warm bond with the girls, embracing their tales of meeting forest spirits like Totoro and soot sprites with open-minded encouragement. His attire—glasses, shirts, pullovers, and trousers—complements a lean, tall frame and scholarly air softened by approachability.

Professionally versed in archaeology, he intertwines academic work with personal reverence for Shinto traditions, often visiting shrines to honor local spirits and subtly weaving animistic practices into family routines. When Mei insists she encountered Totoro, he validates her by proposing it could be a forest guardian, later guiding the girls to a shrine to thank the spirits, aligning gratitude with cultural custom. During crises, such as Yasuko’s delayed recovery, he anchors the family’s emotional stability, soothing Satsuki’s anxieties while sustaining hope for her mother’s return.

Hints of a Hokkaido link—possibly through education or origin—emerge via a novelization citing his knowledge of a Hokkaido University-associated song, though primary narratives leave this unconfirmed. He peripherally senses supernatural occurrences, like distant flute melodies or fleeting shadows during the girls’ adventures, yet attributes these to owls or natural phenomena, balancing wonder with pragmatic rationality. His portrayal remains focused on steadfast devotion to family unity amid adversity, with no expanded appearances beyond the original film documented in official media.