Akiko Yosano

Akiko Yosano (与謝野 晶子,) is a member of the Armed Detective Company.

Appearance
Akiko is a young woman who takes care of her appearance. She has black hair with straight bangs cut into a bob that reaches past her chin. In the manga she has dark grey eyes, which was changed to pink in the anime.

She wears a white button up blouse with puffy sleeves that end in the middle of her forearm. Her shirt is tucked into a plain black skirt that flares out above the knee. She wears gloves that reach past her wrist, a black tie, and black tights. Akiko wears red high heels and a golden butterfly hairpin on the left side of her hair.

Personality
Akiko is a lady who carries herself with utmost grace and dignity. She prides herself in being both a strong woman and a capable doctor, which is why she does not take too kindly to those who belittle her in both respects. She appears to be a feminist who believes now is the age of equal rights for men and women. She almost always depicted as calm and composed, but when angered, she is quite the force to contend with.

Despite her appearances, she has shown prominent sadistic and aggressive tendencies, which is more so magnified by her ability's conditions. As a result, most members from the Agency flee when in her presence and as much as possible, avoid getting injured even in the slightest so as to circumvent her unique brand of “treatment”.

As the sole doctor of the Detective Agency, she highly values human life and is significantly averse to meaningless deaths and killings. She will violently admonish those who believe otherwise and is very keen on doing so without much hesitation.

On a side note, she appears to love shopping to a great extent, and when not working is often showing buying large amounts of clothes such as in episode 8 and chapter 40. This could also imply she is a fashion conscious.

Ability
Akiko has a rare ability among ability users, Thou Shalt Not Die (君死給勿,), which allows her to heal external wounds. However, to heal someone they must first be "half-dead"; meaning they must have fatally serious injuries before she can use her ability. Due to this, her ability is inconvenient for healing minimal wounds since she needs to fatally injure that person first.

Background
She was one of the people who attended the meeting Dazai organized to think up Atsushi's entrance exam. In chapter 32, it is revealed Rampo is the one who invited her into the detective agency in the first place.

Plot
She, among the other Ability Users of the Armed Detective Company, were present the night Osamu Dazai revealed Atsushi Nakajima to be the man-eating tiger. She later expressed disappointment at the situation by stating that the lack of casualties was "boring".

The Tragedy of The Fatalist
Yosano made a brief appearance after the clash between the Armed Detective Company and the Port Mafia (episode 4 in the anime), tending to Junichirou Tanizaki's injury.

Teaching Them To Kill; Then To Die
Looking for a shopping partner, Yosano decided to take Atsushi with her as the remaining members of the agency had flown the moment they realized her intentions. After forcing him to come along with her, Yosano made him carry the numerous packages that she bought, warning him to not drop a single one.

Atsushi, occupied by a passing Kyouka, bumped into a man, dropping the boxes he was carrying and knocking the man to the ground. The man immediately went off on Atsushi for dirtying his expensive suit. Yosano, seeking to defuse the situation, apologized and wiped the man's suit, asking if he was hurt.

Instead of calming down, the man slapped Yosano's hand away and proceeded to criticize her in a lewd and derogatory way. This causes her to lose her patience and hurtfully grab the man's hand. She then says that she's a doctor, and threatens to cut off his body parts because he seems to have too many.

At the train going back, Atsushi apologizes for the situation earlier and for dropping her things. Yosano tells him it was nothing, then suddenly proceeds to examine Atsushi's leg, the one torn off by Ryunosuke Akutagawa's Rashoumon. She finds no scarring nor any trace of the injury, and marvels at it—saying that it's a full restoration rather than a regeneration. Atsushi fearfully asks if there was a problem, and she lets go of his leg, saying she's just sad that she can't treat him. She tells him that there's no next time for him, for the Mafia are known for surprise attacks. She tells him to watch himself and be ready for their next attack.

Right on that moment, the train's PA system sounds.

Trivia

 * Akiko is named after a feminist pacifist poet whose work was considered controversial in her time for portraying and encouraging female sexuality. Her ability is likewise named after one of the real Yosano Akiko's poems, which was addressed to her brother and published during the height of the Russo-Japanese war. It was subsequently made into a song and sung in protest to the war.
 * She says the obituary is the most interesting section of the newspaper, as it judges people "the most fairly," to which Dazai agrees.