I assume that question was for ferorodono, but as a writer myself, most of my characters are female. It's fine in my book (pardon the pun). But I really don't think it matters, just as long as your character is interesting and someone a person will want to read more about.
It's just that when i started writing I had a ensemble of five characters, two of which male. But later on, as my writing "evolved" and I started creating separate characters, the first ones are female. And i find it sort of hard to think and make a developed male character. I guess I'll sort it out with practice.
Yes, the most important thing for a character is to be unique.
I agree with . Your story can consist of all female characters, or all male, as long as they are rounded out and it makes sense to have no (or next to no) male characters (maybe the story takes place at an all girl's school?). Of course, there are so many exceptions to this that it all depends on how YOU write it. Hope this helps! ^^