I would add, for any character, make sure to support that a character’s negative traits are actually negative by portraying them in a bad light and giving their bad choices consequences. If you’ve given your LI, for instance, the negative traits of being stubborn and selfish, and then have the MC think that behavior is cute and normal and there are no consequences for the LI, then they aren’t really bad traits, they create no conflict and add nothing to your story. Not to mention they make your MC look bad for accepting that behavior.
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