Une petite théorie intéressante que j'ai vu sur Arlong Park et que je remet ici, de la part d'un certains UndeadFailure.
"I may be reaching here, but I just want to bring this up.
Ging said that Ai and Papu are already present in the human world. We know Ai exist in the form of Nanika, but what about Papu?
http://i.imgur.com/UxsRg5t.jpg
This is a reach, but, is it possible Pap is connected to the Sonata of Darkness?
Its description is "A trade off between life and pleasure"
I don't know if listening to the devil's sonata is a pleasurable experience, but one does get things in exchange for listening to it. Then there is Melody's body, it caused her to shrink(maybe) and lose most of her hair, and there is something wrong with the appearance of her arm that wasn't shown, and she said the person who played it entire body was like that. (not from an official translation) Whatever the song did to him, it changed the appearance of his entire body into something apparently grotesque.
Is there anything else mentioned previously that may be a connection to Papu?"
Pour résumer la théorie, il lie ici, Papu et la mélodie que recherche Senritsu, par le fait que après l'avoir écouté Senritsu a vu son corps déformé, ce qui semble arrivé aux victimes de Papu.