Kodo Nomura has short gray hair and a physically youthful appearance, typically dressed in a purple jacket over an olive green waistcoat, buttoned over a white collared shirt. He embodies a caring older brother persona, demonstrating reliability and responsibility within his social circle. His longstanding connection to Kyosuke Kindaichi dates back to their middle school days.

Reflecting his historical counterpart's profession as an author and music critic, Nomura is a regular patron of the Milk Newspaper Kikunyusha and associates with literary figures like Takuboku Ishikawa and Kyosuke Kindaichi. He enters the story directly in Episode 3, appearing alongside Hagiwara Sakutaro and Yoshii Isamu during the resolution of Otaki's Red Light District murder case. Nomura collaborates with Ishikawa on detective work, assisting in investigations into criminal activities.

He possesses knowledge of Ishikawa witnessing a murder scene, integrating him into the detective agency's central mysteries. His interactions with Ishikawa feature amicable, relaxed discussions about crime scenes and related matters.