R. Star wrote:
But why is the gender identity always female?
If you go by the Destiny novels, it's because the being who created the Collective was female.
And so was the first drone, I believe.
Note that there was going to be an episode of Enterprise
which would have starred Alice Krige as a Starfleet doctor who is assimilated and becomes the Queen. But they dropped that.
I guess there's no reason why the regular universe Borg couldn't have had a King. Just comes down to 'who came first' and thus the Borg used them as a template.