Ok, så jag avslutade böckerna och är nu av den uppfattningen att
Beloved is male.
Det finns främst två skäl till detta
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.
Det finns några små ledtrådar som går emot detta som
She seems to teach Vestrit how to disguise herself like a man, very familiarly.