Characters in the plotCharacters in the plot are an extremely important element. Without them, it is difficult to even speak of a plot. One could only start a narration - first this happened, then that, and finally something else.
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First, we must find an appropriate main character, someone to whom something bad will happen, or who will be given a life-changing opportunity that pulls them out of stagnation or peaceful existence. In other words, we drag them - by force or by temptation - into our adventure.
Often, the protagonist is unprepared and unaware of what awaits them.
There must also appear an opposing force, preferably much stronger than the protagonist, one that makes the audience fear for our hero. The outcome of their struggle should remain uncertain until the very end.

It's worth describing the hero at the beginning, and then gradually filling in their unique traits as the story unfolds. It's good to have a completed questionnaire not only for the main character but also for every important figure - from the main antagonist to minor opponents and the protagonist's friends.
This data helps keep the character consistent, though still capable of change throughout the story. If a character arc is needed - and it's especially worthwhile for the main hero - such a list will help design the story so that it continually tests the character's weaknesses and encourages them to train in areas where they are still lacking, preparing them for the grand finale and climax.
For example, a character with a weak psyche cannot suddenly and for no reason easily start leading a team of commandos. If that is to happen, they should first be strengthened through various situations, so that they can ultimately handle such a task.
One way to create such a questionnaire is to write down answers to various questions, starting with:
You can also use the Story Designer application, which contains many parameters already included in the program, where you can fill out the list of characters and their attributes - including physical appearance and mannerisms.