Kunikida Doppo

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 also practical to a fault, as he almost considered abandoning a kidnapped Atsushi Nakajima, because the boy's presence might implicate the Agency. He also once advised Atsushi to give up on the wanted Kyōka Izumi, lest his one-man boat might sink the both of them if he saves her, though he soon encourages Atsushi later on when the latter shows resolve to rescue her. Despite this, Kunikida is nonetheless a trustworthy and loyal detective upon whom many in the Agency rely on because of his authoritative capability and responsible nature, which is why he's deemed as the Agency's next-in-line to becoming its President. 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, such as data-gathering, planning, making the world a better place, and most importantly, a medium for his ability, The Matchless Poet.

Though he often appears calm and careful, Kunikida is also known for his exasperated outbursts, which are primarily caused by his partner, Osamu Dazai, who constantly vexes him with his suicidal attempts. However, Kunikida does not genuinely dislike Dazai. He acknowledges Dazai's skill and knowledge when first working with him, and he continues to entrust much of the Agency's strategies to Dazai. Kunikida extends similar faith to Ranpo Edogawa, as Kunikida actively participates in letting Ranpo believe Super Deduction is a real ability, since Kunikida respects Ranpo's detective prowess and its value to the Agency.

He is also somewhat naïve and prone to easily believe Dazai's lies, including the "merit" of a noose when it comes to improving neck strength and that extreme shouting can cause hemorrhoids, which he later jots down in his notebook for future reference. Kunikida values human life, as he strives to save all innocent people during dangerous events in Yokohama. He sticks to this belief after seeing young people injured or killed in front of him. As a result, Kunikida never thinks killing his opponents is the only option, and constantly looks to solve problems without bloodshed. Due to Kunikida's passion to try to protect the city and its people, Ranpo believes he is the strongest and most virtuous person in the Agency.