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“Every interaction between two people is on some level a negotiation for status.”
— Zack Stentz
Dialogue is action. Characters use dialogue to get something. They reveal themselves in their actions. Whether they tease, seduce, or threaten they will do it differently (hopefully) than everyone else in your script. Figure out who they are, what they are up to, and what they want.
Via All Your Characters Talk The Same — And They’re Not A Hivemind!