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->''"Loving spaceships is my one defining trait!"''
-->-- '''Benny''', ''WesternAnimation/TheLEGOMovie2TheSecondPart''

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A flat character is one that has only the bare minimum of characteristics necessary to play their role in the story.

[[Administrivia/TropesAreTools Being flat is not automatically bad.]] Character depth should be proportional to the character's importance to the story. The fact that the cocktail waitress is a leukemia survivor who is working two shifts to pay off her medical bills, all while trying to polish off her doctoral dissertation on Ming-era Chinese poetry, squeezing out enough time to decide which of her three suitors will best be able to get along with her aging, beloved Pomeranian-Pug pup ... all comes under the heading of "too much information." By the time all that is relayed, the customer waiting for their drink has died of thirst.

Indeed, [[TheLawOfConservationOfDetail adding details]] to the character indicates to the audience that the character is to be important. The SpearCarrier, the RedShirt, and the BitCharacter may require a Flat Character, to prevent the reader from feeling cheated. This is why we get the FatalFamilyPhoto - if an otherwise interchangeable RedShirt takes the time to establish his hopes and dreams, it's obvious they're going to be dashed in the name of drama. NominalImportance is another example of this.

For this reason, StockCharacters are used to flesh out a world without bogging down the story with endless backstory for each character. The audience doesn't need to know everything about the character to understand quickly what role they'll play in the story because of the stock character's easily recognizable characteristics.

Characters who start out flat can be [[DynamicCharacter fleshed out]] into {{Rounded Character}}s with CharacterDevelopment, HiddenDepths and/or being RescuedFromTheScrappyHeap. Or some characters can look flat until the RedHerringShirt reveal shows that they are truly full characters. They can also become a StaticCharacter trapped in amber with repeat uses of a ResetButton or SnapBack, negating what little growth they manage; and they may mutate into ''another'' sort of Flat Character with {{Flanderization}}. Some writers intentionally make characters flat to display their unhealthy psyche.

FanFic writers may take the liberty of developing Flat Characters from essentially whole cloth: see OCStandIn for details.

For more fleshed out examples (for lack of a better term), see TheGenericGuy. If you were looking for tropes about characters that are ''literally'' flat, see PaperPeople, SquashedFlat, or maybe PetitePride or ACupAngst. For ''emotionally'' flat characters, see TheStoic or StoicWoobie.
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