Holy crap. That is way too complicated for me. I just introduce characters the way I would if I were telling the story to someone in person.
So you're a pantser. Congratulations! you have found your writing style.
The point I was attempting to make with my "detailed" instructions was this:
When introducing a character, FIRST determine if they are necessary.
Why?
Have you ever listened to a teenager tell you about a movie they just saw?
It's excrutiating. Why? because they ramble. They can't (well, most of them can't) tell you the synopsis of the story, the main characters, events, etc. in an order that relates the tension of what they witnessed.
Some newbie writers are guilty of this as well because they haven't learned to think through things and boil it down to the important points.
Another example: Stephen King. He boils his stories down to a "what if" statement. (This is just another name for.... the main plot point YIKES, SK is a plotter!)
What if the family dog gets rabies and turns on the family?
What if the patriarch of a family gets possessed by evil ghosts, goes nuts and tries to kill everyone around him?
What if the class troll has magical powers and uses them to get back at everyone who mistreated her?
Don't get me wrong, characters are the driving force of your story, however, without knowing why they are doing what they do, why they are on the toilet - so to speak - you can't build an effective story.
So, when introducing your character, you decide where they are. Why are they there? What are they doing that impacts the story?
Personal example: I begin a story with my MC waiting for his brother to pick him up from his flight home.
The story revolves around him finding out he has a daughter he never knew, and the fact that she shouldn't exist because his mother experimented with his DNA to make him immune to a disease (this is set in the future) that causes early death. The treatment should have rendered him sterile.
OK, why start with the bus stop scene? Because it introduces the MC, his brother (who ends up kidnapping the MC's daughter - although you don't know this until Act 3), and the mom who created this problem in the first place.
All the major players are there. We get to witness their interaction just before the shoe drops. (It's a family with issues, so not pretty.) and it has a direct correlation to the climax through introduction of the brother who is the villian.
This was an intentional choice. I could have started it years before when the MC was in prison, or later, when he first discovers he has a daughter, but by picking that particular moment in time, I set up both external and internal conflict for the MC. I gave him issues he's trying to overcome to be a better person than he was, and gave him a nemesis who will make him choose between being a good person and being a not good person.
Amy