Nagahiro is a soft-spoken and well-mannered individual, with a constant composed attitude[1]. As the oldest of the Pretty Boy Detective Club, he is shown to be the most mature member, keeping his more eccentric companions in check, although he still has a childish spirit, as that is a requirement to be a part of the club[2]. He is shown to be quite the intellectual and cunning individual, outsmarting even Rei[3], a professional criminal, and being a worthy adversary for the equally shrewd Rai Fu