The main characters of my story are four. For approximately thirty chapters the main characters are three and after they'll meet the four. The problem is that during this thirty chapters there is the time necessary to create a balance between these three characters. If I insert a new character in the group, i don't know how can change the balance and I'm afraid that the new character could not insert in the group and that It can seem marginal. For these reasons I would that this character could have a strong personality, but not trite or stereotypical. Then, I would that he's not similiar to other three, but I have not idea where to start. How do you create a new character? Do you follow steps or a scheme?