Yosano is a strong and highly-determined woman who is willing to heal others with her ability. Given her traumatic past filled with deaths of many soldiers, especially Tachihara's brother, from the Great War, she, as the only doctor of the Armed Detective Agency, highly regards human life, and in retaliation, she is easily angered by those who don't regard it otherwise, as well as Mori's idea to recruit her as a member of the Port Mafia as a means of exploitation of her ability.