Edogawa Ranpo

Ranpo takes extreme pride in his "ability" which can solve any mystery in mere seconds, with which he has solved countless cases. With his incredible intelligence, he is commended for it by the rest of the Armed Detective Agency, even more so because he lacks an ability. He is often found bragging about his status as the greatest detective in the world. Ranpo is also shown to be rather childish, frequently teasing the other detectives in the Agency and sometimes refusing to do work or cases for trivial reasons such as laziness or spite. Ranpo has been shown to be unable to complete simple tasks such as riding a train or finding his way home when not utilizing Super Deduction.

However, despite this demeanor, Ranpo becomes serious and calm when the situation calls for it. Atsushi Nakajima once noted Ranpo's serious façade when devising their plan in protecting the virus-stricken Fukuzawa, an expression he admitted he has never seen before in the great detective. One of his long-time colleagues, Yosano, also understood Ranpo's grave concern for the President when placed in trouble.Because of the Agency's faith in him, Ranpo equally places his trust in them. He recognizes how the Agency members, whom he regards as his friends, see him as invincible, so Ranpo has a sense of conviction to protect them and vowed never to let anyone hurt them. This rings true most especially after the events of Cannibalism: Ranpo admits his failure to catch Fyodor Dostoevsky, which might have prevented a child's death and consequently Kunikida's arrest. During such cases, Ranpo does acknowledge that he has limitations himself, but he is nonetheless more than willing to perform any plausible means to solve the situation.

Notably, even though his colleagues seem to think that he is completely oblivious to the fact that he is not an ability user, he is aware that his Super Deduction is in fact not an ability. However, since the Agency puts so much faith into him, he initially refused to openly admit this to anyone in the Agency, as he refused to believe Fukuzawa when the latter straightforwardly told Ranpo that he is not actually an ability user and seemed to dance around the topic with Yosano, yet he outright admitted his lack of ability after the Yokohama fog incident caused by Tatsuhiko Shibusawa and later to Mushitarō Oguri.With his vision and desire not to lose to Fyodor nor to anyone again, Ranpo carefully learned Fyodor's ways and willingly took in the Conjurer himself, illustrating Ranpo's exceptional resolve to do anything that he can for the sake of protecting the Agency. He claimed that such intimidation surpasses that of a typical deduction skill, which can defeat even detective killers and evidence suppressors—the great detective's weaknesses—like Mushitarō. He even put up a contingency plan to ensure that the Agency would be given all the help they need, especially from Mushitarō, in their battle against the Decay of the Angel, as he threatened to expose Mushitarō's friend's legacy to the public that might defame the late author. In addition, Ranpo has a certain kind of charisma that plants an apparent change in his former adversaries into people who aid him subsequently in different manners. One notable example is Edgar Allan Poe, once his sworn rival whom Ranpo defeated in a deduction battle six years ago, who gradually becomes one of Ranpo's trusted allies in his later pursuits and cases, such as the Cannibalism strategy, its aftermath, and in rescuing Agency members and affiliates during their frameup. Another is Mushitarō himself, who prides himself as the infallible detective killer who challenged Ranpo but later warned the great detective of the Decay of the Angel' threat out of his own volition. Minoura, a police officer who initially doubted Ranpo's detective skills, eventually sought his occasional help and later broke him out from arrest together with 30% of Yokohama's police force. Through his words of persuasion, Ranpo was able to turn such percentage of the military police into believers in the Agency despite being a wanted terrorist at the time.

Ranpo also appears to have a great memory, as he is able to remember his duel with Poe from six years ago and identify Minoura as the "man whose subordinate he arrested". In his years of solving baffling cases as a detective, he seems to remember some of his clients, as hinted when he turned to a specific police officer out of the many arresting him, whom he possibly recognized to have helped out some time in the past.