Ok, então terminei os livros e agora sou da opinião de que
Beloved is male.
Existem basicamente duas razões para isso
When Fitz recalls Beloved from the dead, they switch bodies. And I think he would probably have known that Beloved is male/female then. Since he did not raise a fuss over it, it seems very likely that Beloved is male. Secondly, the Pale Woman also speaks of Beloved as male. She knew Beloved when he/she was a a child, so it seems unlikely Beloved was as mysterious then. However, there's also the issue that she seemed to be picking up stuff to say from Fitz's mind through the Skill, and that she offered herself to him physically (saying she would provide him what Beloved would not), this might be a little suspect.
Existem algumas pequenas pistas que vão contra isso, como
She seems to teach Vestrit how to disguise herself like a man, very familiarly.