Dayu Usukawa

Dayu Usukawa (薄皮 太夫, Usukawa Dayū) is the right hand of Dokoku Chimatsuri and the only one he is kind to, provided she knows her place as his obedient and unquestioning servant. Her character is the basis for the futakuchi-onna of Japanese myth.

Background
In life, she was Usuyuki (薄雪), a woman who obsessed over Shinza, a man who never loved her. However, when scorned that he loved another woman instead of her, Usuyuki incinerated him and those at an engagement party in a suicidal crime of passion. But once witnessing that Shinza would still love another, Usuyuki's emotions corrupted her soul and turn her into Dayu, bonding Shinza's soul into a shamisen that she carries with her, creating eerie and unsettling songs that become a means to soothe Doukoku's rage. However, she has trouble getting along with the Ayakashi because of her life as a human, which she makes attempts to reclaim.

One failed attempt results with her being saved by Juuzo, developing feelings for the Gedou as she begins to defy Doukoku's orders as well. Though she claimed her feelings for Shinza had long died, after becoming a rogue, Dayu refuses to give him up as it would end her existence and she doesn't want Shiza's soul to be reunited with his love. Doukoku angry that she did not killed Juzo as he ordered her to, he burnt her shamisen, making Shinza moan. She told Juzo her feelings for Shinza had disappeared but Juzo did not believe this true. Soon after Akumaro's demise, Dayu returns to the Rokumon Junk to assist in Doukoku's reawakening.

Dayu deliberately has Shinken Pink taking care her shamisen. which discards her of her past life, but it also revives Doukoku. She later uses the last of her power to restore Doukoku's body with only her kimono remaining, which Doukoku later throws into the Sanzu River. In battle, Dayu wields a shortsword hidden in her shamisen, with the headstock as its hilt.

Trivia

 * Dayu's name can be translated as "thin-skinned courtesan" (薄皮太夫, usukawa tayū)