Breno_Ranyere
A good story should have both developed. What would help is actually knowing your character before you wrote them. Creating a character sheet would do wonders for that.
Just like world creation involves making a system, then strictly adhering to it, making a character involves knowing their motivation and filtering everything through that lens. On that note, before you make a character you should list all of the important throngs about them to make sure they are consistent. Here is an example I made up:
Name: Amber
Appearance: Long brown hair, soft brown eyes, freckles, short
Personality: Loud, out spoken, and mean.
Hates: being seen as weak, her short stature, people trying to help her, boys hitting on her or flirting with her, being dependent on others
Likes: making fun of others, being the center of attention, belittling others, feeling powerful, doing things on her own or in her own way
Proficiencies/job: she is a waitress at the inn, but she only does that to pay the bills while she studies to become a knight. The second most promising knight candidate at the academy, she has superior strength and hand to hand combat skills. She can use any common weapon proficiently and also is skilled at horseback riding. Because she works at an inn, she is also knowledgeable about cooking, cleaning, plant/herb recognition, etc. she hates to use these skills though, because people donāt see her as a warrior when she is doing laundry.
Now, you could put this character into any story and have her make sense. If a male character introduces themself to her, she should probably snap at them and make fun of them. All of this info is separate from the plot.
Iāve seen some of these character sheets be so in depth that they include things like favorite foods, favorite colors, sleeping habits, etc. You can also tailor the list towards the plot. If you are writing a story about cooking, her favorite food becomes more important.
Usually, authors donāt do this and their characters are just plot devices. They only say and react to things to advance the plot and are good at or knowledgeable about anything the author needs. The can be idiots, then suddenly know every fact about a town for no reason other than the author needs a way to get facts about the town into the story.
Hope this makes sense!