xxNon-agency of fictional characters

 

"The characters use...."

No they do not. They are characters; they do not exist. Characters cannot "use" anything because they have no existence and therefore no agency. It is the writer, the author, the prose, the words that do all this. The characters are just other words: you have to understand this fundamental point. Lady Carlotta is no more real than the train she missed. She cannot "use" a tone to make YOU react. That's the author who's doing that

who is presented as an impulsive character 

Your grasp of the concepts is still flimsy and your comments indicate that you still misunderstand some of the concepts. But, as I said in the long note above, you need to start by resetting your whole frame of mind when doing this sort of stuff. Reading like a writer, like a critic comes AFTER you have read like a reader. The idea is you read, enjoy and then go back to see how it was done, It is at this point you  need to change  your whole attitude: the characters ar3e no longer characters but simply words on a page, and they are not your friends; the story is being told by a voice that you may have notices, but now need to describe. Whose is it? What tone does it have and so on.

To think outside the box is the phrase, which, being a cliché, is a favorite of people who never do.

This point of view helps the reader understand

External detail used to communicate otherwise invisibile feelings. Consider; characters can express emotions (i) through thoughts, which means the narrator must have access to their mind; (ii) through actions; (iii) through external descriptions that stand for their mood and set the mood of the text.

abode: It is sill used a lot, often on official forms and therefore sometimes in jest (of the mock-formal type).

Dialogue is used to make the narrator feel invisible: The problem  here starts with the passive and the omission of agent: "Dialogue is used" By whom? By the narrator? No, because the opposite is the case:  when there is dialogue the narrator is silent. So you must be talking about the author, which usually not helpful for the purposes of  direct textual analysis. We don't care about the author or his sex or his politics  for now, we care only about how words work on the page, regardless of author. 

Consequently that verb "used" is inappropriate because it implies that there  is a purpose and a use to the dialogue (or whatever else you may single out with that and similar phrases such as  description is used, adjectives are deployed, paratactical structures are added etc). Passives remind the reader  of the missing author. 

Just say the dialogue/the long/short sentences, densely metaphorical language/finely structured sentences/ the series of  exclamations/ the adverbs/ ... the whatever you're talking about  do this and do that: not that they are used  fior that purpose.