As a member of the Armed Detective Agency, Kunikida is very professional and diligent when it comes to his job, because to him, the reputation of the agency takes precedence over anything else. He constantly feels the need to organize, gather, and schedule everything, which is why he may come off as somewhat strict and harsh during investigations. He is almost never seen without his trademark notebook, which he believes to be an "ideal" and guide to life. He utilizes it for several reasons.