The genre doesn’t have to be new but for the love of writing; never let your characters be paper cut outs of every other character out there. Make yours unique and different. How do you do that? By reading and reading a lot to see what’s being put out and do the opposite.
The main characters are to be believable and not just paper cut outs you can find in just about any other book. Break the mode of the pre-set standard of your genre. Create your own. Who says you can’t?
You want readers to empathize and sympathize with the characters and their struggles as they find their way through their world. (yes, there are going to be some readers who will not for whatever reasons.) Display a wide range of emotions with a character. A character that’s angry a lot even they have other emotions. They get boring if they only display one emotions through out the entire novel. This goes for any emotion.
Right now, it’s popular to write about the character being melancholy. That’s fine but it gets boring after a while if the character does nothing else but brood, moan, and groan about how horrible their life is without making attempts to change things. It’s OK to use powers or magic to change things but take the time to study to learn limitations. A character who has no obstacles, weakness isn’t much of a believable story. A character with no limitations nor weakness is God.
You can’t show a strong character getting their butt kicked every few pages. That doesn’t work well either. They are going to have win some battles and lose some.
Don’t use things like what I found in a book I was sent and asked to read and write a review. It was about some type of strong, tough beasts are supposedly afraid of a certain male body part. They are so terrified of the male’s phallus that they freeze in battle and allow themselves to be beheaded.
C’mon. That’s not believable even unto a two year old. Make whatever their strength or weakness is believable.
The writing is great and so is the structure but that can’t help you if you write unbelievable things.