I recently had an ah-ha while writing my latest ms. While my characters may seem “opposite,” at the core I don’t think they are. They’re very like-minded in their values and priorities, but everywhere else they challenge each other–to see things from a different perspective, to strive harder, to follow their dreams, etc. So sparks fly.
It’s not banter for the sake of seeing who is wittiest, or arguing for the sake of debate. It’s moments that will make each other grow for the better…eventually (and for happily ever after). But until then, it makes for an entertaining show.