Kunikida Doppo

As a member of the Armed Detective Company, Doppo 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 every bit of detail, which is why he may come off as somewhat too strict and harsh during investigations.

He can also be seen as practical to a fault, as he almost considered abandoning a kidnapped Atsushi because the boy's presence might implicate the agency. Despite this, Doppo is nonetheless a trustworthy and loyal detective that many in the agency rely on because of his authoritative capability and responsible nature.

He is almost never seen without his trademark notebook, which he believes to be an "ideal" and guide to life. He utilizes its function for several reasons, such as data-gathering, planning, and most importantly, a medium for his ability, Doppo Poetry.

While depicting a calm and careful front, Doppo is also known for his exasperated outbursts, which is primarily caused by his partner, Dazai, who constantly vexes him with his suicidal attempts.

He is also uncharacteristically naive and is prone to easily believe Dazai's lies, which he later jots down in his notebook for future reference.

His ability, Doppo Poetry, makes objects written on the papers of his notebook come into existence. However, it does not work on objects larger than the notebook. Such objects include a wiregun and a regular gun operated for shooting.

He is shown to be able to use pre-written notes as a means for his object summons, which can be especially convenient if one of his hands is bound and incapacitated.

Nevertheless, his ability possesses a greater flaw since the pages of his notebook are limited, and getting a new one is expensive.