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It adds a little difficulty to reading and thus a little chance to screwing up. Although, especially in first-person stories it's a very common and quite nice literary tool to leave the protagoni...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/6840 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It adds a little difficulty to reading and thus a little chance to screwing up. Although, especially in first-person stories it's a very common and quite nice literary tool to leave the protagonist both nameless and devoid of most physical traits that are not essential to the plot. This makes immersion easier: every reader can imagine themselves in place of the protagonist and fit in just fine. (and it's easier with 1st person perspective, "I" in narration is unambiguous.) Still, make sure to give your characters easy to remember (and distinct! Avoid names with identical two first letters on _somewhat_ similar characters!) whenever lack of names is confusing. If seven people in a room discuss, you'll have a hard time making the scene not suck without using at least a few names. Too many names are bad. If a name appears once or twice per whole story it's poor style - it's much better to give the character some very memorable traits (not pink shirt, but rather a glass eye and chipped front tooth), if they are to reappear seven chapters apart, when the reader would long forget the name (and even more so the pink shirt). Do NOT depend on the reader remembering given name. If a character who is not very memorable returns, give a brief synopsis on when they were seen last, a reminder of where they are recurring from. Episodic characters may be quite featureless and very generic - if you take time to give a precise description, you focus the reader's attention, they will try to remember the character, and will be pissed at you for wasted effort if the character never reappears. In the end, the merits are either easier immersion in case of 1st person protagonist, or leaving the characters more impersonal, more distant and harder to relate with (e.g. in Grimm tales). Still, the "nameless character" is correctly executed if the reader asked about the character's name after reading the whole story goes "It's... oh wait, it wasn't mentioned even once, was it?" Essentially, if the lack of name becomes too apparent, you're doing it wrong.