Dayu Usukawa

Dayu Usukawa (薄皮 太夫 Usukawa Dayū?, [γ]) is Doukoku's right hand and the only one he is kind to, provided she knows her place as his obedient, unquestioning servant. Doukoku takes her in after her rebirth as a Gedoushu, giving her the name she now goes by and telling her that she has nowhere else to go but to him.

In life, she was Usuyuki (薄雪?) a shamisen player who obsessed over a man named Shinza. Scorned that he loved another woman instead of her, Usuyuki incinerated him, along with his bride and their wedding party, in a suicidal crime of passion. Seeing that her love would remain unrequited to the bitter end, Usuyuki's emotions corrupt her soul and turn her into Dayu, and Shinza's soul was forcibly bound into the shamisen that she carries with her, creating the eerie and unsettling songs that serve to soothe Doukoku's rage. The shamisen's headstock also doubles as the hilt of a shortsword Dayu uses in battle.

Of all the Gedoushu, Dayu has the most trouble getting along with the Ayakashi because of her previous life as a human, which she makes attempts to reclaim. One failed attempt results with her being saved by Juzo, developing feelings for the Gedounin as she begins to defy Doukoku's orders as well with her shamisen damaged as a result. Though as her feelings for Shinza had long died, after becoming a rogue, Dayu refuses to give him up as it would end her existence. Leaving Doukoku, Dayu wanders aimlessly until she is found by Akumaro who recruits her to his group in return for her instrument's restoration. Until it is repaired, she has to rely on a dagger in her fights. Upon learning that Akamaro never intended to repair her instrument, she attempts to reclaim her shamisen until Dokouku comes to her aid, using a piece of his body to restore the shamisen and reminding her of her place by his side. Soon after Akumaro's demise, Dayu returns to the Rokumon Junk to assist in Doukoku's reawakening. To that end, after finally having the answers to her questions, Dayu deliberately has Shinken Pink destroy her shamisen to not only discard her past life, but to also use Shinza's anguished soul to revive 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. Her sacrifice causes Doukoku to be covered in a protective layer that minimalizes the damage done by the Sealing Character. Dayu is the basis for the futakuchi-onna (二口女?) of Japanese myth.

Dayu is voiced by Romi Park (朴 璐美 Paku Romi?), who also portrayed Usuyuki in her lone appearance on-screen.