I struggle sometimes to decide whether a character should be male or female. An odd struggle to have, I suppose, since it’s the first thing most character sheets ask for. But there’s a lot of added weight which comes with the decision and the entire outcome of the story may rest upon it. Before this new person in my head even has a name, they might have an entire set of character traits that I hadn’t even considered yet and all because I went with one gender over the other.
Just because those implied traits are there doesn’t mean I have to take any notice of them of course, but readers might.