Hiroshi Nohara, the father of the Nohara family, works as a low-level manager at Futaba Shoji. He often works overtime to meet his family's financial needs, including a 32-year mortgage. Married to Misae since meeting her at age 29, they have two children: Shinnosuke and Himawari. At 31, Hiroshi juggles being the sole income earner with making time for his family. He hands over his earnings to Misae, who handles all household spending.

His personality includes a habit of watching and flirting with women, a trait shared with his son Shinnosuke, leading to frequent reprimands from Misae. Despite this, he remains faithful to his wife. Hiroshi avoids physical discipline with his children, preferring calm conflict resolution. He sometimes entices Shinnosuke on outings by promising sightings of beautiful women, a tactic that occasionally angers Misae. A notable physical trait is his smelly socks, repurposed by the family as a deterrent or punishment.

During the family trip to Australia depicted in *Crayon Shin-chan: Honeymoon Hurricane ~The Lost Hiroshi~*, intended as a postponed honeymoon coinciding with a rare annular solar eclipse, Hiroshi is kidnapped shortly after arrival due to his connection to hidden treasure. His abduction forces Misae, Shinnosuke, and Himawari into a rescue mission, evading treasure hunters and a masked antagonist. The story centers on Hiroshi's involuntary role as the key to the treasure and the family's effort to save him amid threats.

Born in Omagari, Akita, Hiroshi has an older brother and a niece. He quit smoking when Misae was pregnant with Himawari. While generally responsible, his nostalgic tendencies are occasionally depicted, though not directly explored in this specific film.