If you believe that your narcissist spouse will want to pay child support in order to prove to the world what a good person they are, think again. Extracting child support is not going to be easy. A narcissist spouse will fight the concept of paying you anything for the children with whatever lies and manipulation of the legal process they can muster.
They are likely to pay slow or not at all even if you have a very clear court order requiring it. A narcissist doesn’t think about the needs of their children. You may stay up nights worrying about whether your kids can go to summer camp or keep up ballet lessons after your divorce, but your ex won’t want to pay.