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Source: https://writers.stackexchange.com/a/39132
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Typically, this is an Epistolary First Person (on wikipedia it's listed as Epistolary novel) if the narrator is presenting facts after they have happened in such a manner as to be read as a false document of events. The best known version of this is the character of Dr. Watson from the original Sherlock Holmes stories, who in the fictional universe, is the biographer of the fictional Holmes and the stories are his recollection of the case after the matter was solved. The general rule is that it must be presented as a primary source of events by a side character.

This is quite popular narrative voice in many classic horror and mystery types and can be found in Frankenstein, Dracula, and Dr. Jekyll and Mr. Hyde. It need not be an actual document, but the narrator must be telling to story to an audience after the fact (ala filing a police report or speaking to a news reporter. Frankenstein is an example of this type.). This is seen on visual medias such as the Merchant from Disney's Aladdin, possibley Cloppin from Disney's Hunchback of Notre Dame, and Future Ted from "How I Met Your Mother". The "Captain's Log" monologs from Star Trek may make the franchise lightly this as well.

In Gatsby's case, he is talking to a psychiatrist (I think, I've seen the movie more recently than I have read the book). I can't speak for your other novel.

Original score: 1