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I don’t care if you have good sentence structure or you know how to write well, your plot needs to make sense.
Research relationships, research small details, understand what someone is doing and W H Y.
If someone is going to be rude, give them a reason, being naturally evil is not a reason! Make them spoiled, abused, mentally ill, suffers from trauma, something!!
Even if you have a hard time putting those details into the plot, you don’t need to. Don’t just say “so and so is spoils because..” make them act as if they were spoiled, give that spoiledness a reason and a place to foster.
You don’t even need to say “spoiled” at all for others to know, use those damn context clues.
Is a character religious? Okay, why are they religious? How far does their religiousness go? What is there religion about?
If someone kills another person, why? What happened to the relationship and the petiole involved to cause that? Even if it’s a fucking side character they have just enough emotions as the main character. They have their personalities and individuality and you have to use it.
Even if you’re gonna only use them to forward some plot, they still are people.
TLDR: w h y?