Never refer to your script as "my baby". If you're guilty of this offense, clearly we know that you're passionate about your story, which is good. But it also makes your ability to be objective with the material suspect. And you must be objective. Subjective emotional attachments can blind you from the truth of script theme, from solving story problems, or from negotiating character differences – all of which are essential to rewriting your screenplay. And if you're serious about being a writer, you better face up to the fact – if you haven't already – that all…

Rivals are adversaries. They are supporting characters who dislike the hero, creating minor obstacles, but since they don’t oppose the hero’s objective, they’re not antagonists.