They, like us, will behave in disparate ways with everyone.
Our job (as writers) is to know our characters so deeply that we can predict how they will react to certain people.
Perhaps our main character grew up with an abusive father. She's going to be skittish around that new love interest who is nothing but nice to her.
Perhaps he had a bad experience with a former manager. He might approach his new boss with trepidation.
Perhaps she loved her grandfather who served in the war. She's likely to treat the elderly and/or the soldiers she meets with respect.
Perhaps he hates his mother. He'll likely hate all women, but not at first. At first, he will be charming, but this is just a game, and he'll eventually grow tired of it.
Now . . . what if these were the same two characters?
Our character's histories, their likes and dislikes, etc. will all inform their behaviors in some unique way, and this should be taken into consideration as they interact with the other characters in your story.
If Character A doesn't react differently to Character B than he does Character C, is he really human (i.e. complex)?
Ask yourself: How does my character act and react around this person?
Then plan your character's personalities accordingly.
Be Brilliant!
~Katie~
