Thank you very much for your suggestions. Here are some more sentences I'd like you to check.
1)The first-person narrator can coincide with a character in the story or the protagonist who recounts his life (also: who tells of/about his life, who narrates about his life ??).
2)The description of a character can be direct, if/when the character tells the reader of/about his own appearance and personality/talks about himself directly. (Are these verbs all possible??).
3)It can also be indirect, when/if the reader has (not: should?) to infer (not: comprehend, understand?) the character’s appearance and personality from his interactions with the other characters.
4)The description of a character can be divided into two types. A flat character is built around (on, upon?) a single psychological trait and his personality doesn’t develop in the course of the story (throughout the story, during the story, in the narrative frame: are they all possible?) .
5)On the other hand (on the contrary/in contrast? Are they all possible), a round characters changes his personality and can even influence the plot (can have an influence on the plot).
1) The first-person narrator can be the main character in the story or the protagonist who recounts his own life.
2) The description of a character can be direct, such as when the character tells the reader about his own appearance and personality.
3) It can also be indirect, such as when the reader has to infer the character’s appearance and personality from his interactions with the other characters.
4)The description of a character can be divided into two types. A flat character is built around a single psychological trait and his personality doesn’t develop in the course of the story (throughout the story, during the story, in the narrative frame: are they all possible?). All are possible, yes, but the first (before the parentheses) is best.
5) On the other hand (on the contrary/in contrast? Are they all possible <~~yes), a round character changes his personality and can even influence the plot.
1) The first-person narrator can be either a character in the story or the protagonist who narrates his life's events. Alternatively, you can say "who tells of/about his life" or "who narrates about his life" to convey the same meaning.
2) The description of a character can be direct when the character personally discusses his appearance and personality with the reader. In this context, all of the suggested verbs ("tells," "talks") are appropriate.
3) Alternatively, the character's description can be indirect, where the reader infers the character's appearance and personality by observing their interactions with other characters. While the use of "comprehend" and "understand" can also convey the meaning, "infer" is a more accurate choice in this context.
4) The description of a character can be categorized into two types. A flat character is constructed around a single psychological trait and does not undergo any significant personality development throughout the story. You can express the timeframe by using "throughout the story," "during the story," or "in the narrative frame."
5) On the other hand, a round character experiences changes in their personality and may even have an influence on the plot. Using "on the contrary" or "in contrast" can also convey the intended meaning.