Daijiro Ohara leads daily operations as Section Chief of the Kameari Kouen-Mae Police Box, managing subordinates including Kankichi Ryotsu. He possesses a short, bulky build, thick eyebrows, a square mustache, and is always seen in the official police uniform: blue coat, black tie, and police hat. He typically carries a brown satchel and commutes by bus and train. Ohara balances strict professionalism with modesty and consideration. He frequently scolds Ryotsu for laziness and disobedience using his signature "Baka mon!" catchphrase. Despite this, he harbors paternal concern for Ryotsu, viewing him as a surrogate son and occasionally showing pride in his efforts. Ohara maintains a diligent work ethic, prioritizing the police box's reputation and avoiding conflicts with superiors like Gomesu Tonda. His traditional Japanese hobbies include kendo, judo, shogi, calligraphy, bonsai, tea ceremony, and classical theater. He exhibits occasional whimsy, like an episode of cross-dressing as a schoolgirl. His family consists of his wife Yoshiko, who provides emotional stability and advice, and his daughter Hiromi, whom he taught tea ceremony. He displayed overprotectiveness toward Hiromi, initially opposing her marriage but later accepting it; he is now a grandfather to her two children. Among colleagues, he trusts Keiichi Nakagawa and Reiko Akimoto for their reliability, addressing Reiko as "Reiko-kun." His relationship with Ryotsu began years earlier when Ohara arrested a young, drunken Ryotsu. This encounter inspired Ryotsu to join the police, and Ohara later gifted him sandals to replace uncomfortable shoes. Ohara also shows interest in fellow officer Haya Isowashi due to shared cultural pursuits. Ohara's background includes past service with a subordinate named Iwata, contrasting with his current demeanor. His assigned birthday remains inconsistently documented across series media.