dint mean to be creepy but but in Sonadow is shadow-kun the female ou male?

The male in most Sonadow that I know. :3

They're both males.

But if this would be a straight couple, Shadow would definetly be a female.

It all depends on the version of Sonadow toi create. My favori kind is Shadow=>Uke, Sonic=>Seme.... so in my opinion Shadow is. But your opinion depends of the fanfiction itself.