Jisatsu Hōjōn'na

Jisatsu Hōjōn'na (自殺幇助女; Literally "woman who abets suicide"), known among few by her actual name Dōa (瞳阿, Dōa) is a of, former member of the Naiu people and member of a highly secretive criminal faction.

Behind the Scenes
Both her appearance and the name "Dōa" originate from the Blade of the Immortal manga.