History Main / OneLetterName

* The protagonist of Creator/FranzKafka's ''Literature/TheTrial'' is named Joseph K.

* L-sama from ''LightNovel/{{Slayers}}'' novel afterwords. Though this is an abbreviation of L.O.N. or Lord of Nightmares.
* D, the most evil god of ''LightNovel/SoImASpiderSoWhat''. It's not actually her name, which nobody knows, just an alias she chose to make conversations less tedious than being nameless. Odds are good it's the initial of her actual name, D[[spoiler:death]].

* Y in ''LightNovel/HumanityHasDeclined''. Assuming that's her actual name, seeing as [[NamelessNarrative no one else has one...]]

* Z from ''WesternAnimation/AllGrownUp''. [[OverprotectiveDad Chas]] tries asking what it's short for, but he says "It's just Z."

* Y is an alien from the video game ''[[VideoGame/{{Richman}} Richman 11]]''. He is a smart alien who likes science, and possesses the ability to make his opponents lose money when he loses his, owning more cards than his opponents, as well as taking his bankrupt opponents' cards and properties.

* Ian "H" Watkins of Music/{{Steps}}

* Music/{{X|AmericanBand}} was at the forefront of the Los Angeles punk scene.
* Music/XJapan was known in its early years only as X; they adopted the "Japan" once they broke into the international market, to distinguish from the above.

* Ian "H" Watkins of Steps.."

* X was at the forefront of the Los Angeles punk scene.

* Smartotchi/X-Kamen, the ArcVillain from ''Anime/{{Tamagotchi}}! Miracle Friends'', has a companion named X.

** Y, a commune in northern France; amusingly, "y" is [[PunnyName French for "there."]]. Also a "census-designated place" of the same name in Alaska. And a short river in Siberia.

Compare YouAreNumberSix, when the name is a number. JustForFun/NotToBeConfusedWith OneLetterTitle. Contrast OverlyLongName.

** The main character, X. Technically a shortening of Megaman X, [[AllThereInTheManual but no one ever calls him that in series.]]

* [[PaperThinDisguise Mr. L]] from ''VideoGame/SuperPaperMario'', though that's not his real name. [[spoiler: He's Luigi, much to the surprise of no one.]]

** Q from ''VisualNovel/ZeroTimeDilemma''. Also [[spoiler: Delta in the same fashion as Sigma and Phi above]].

* Z, the BigBad from the [[AntagonistTitle eponymous]] ''Franchise/OnePiece'' movie ''Anime/OnePieceFilmZ''.

* D in ''''VideoGame/AnotherCode: Two Memories'' (a.k.a. ''Trace Memory''). [[spoiler:D turns out to have been a nickname. His real name is Daniel.]]

* In ''VideoGame/XenobladeChronicles3'' the Consuls all only go by a single letter, span most of the alphabet [[spoiler:and taken from the first letter of their given name when they were originally human]].
* One of the playable characters of ''VideoGame/XenobladeChroniclesX'' is named L. Technically, his full name is L'cirufe, but he prefers to go by just the first part.

* Mr. X from ''VideoGame/MetalGearSolid2'', a mysterious cyborg ninja that Raiden encounters after defeating Fatman. [[spoiler: It is revealed this was Olga Gurlukovich, who was a double agent for the Patriots among Solidus's ranks.]]

* D from ''VideoGame/EldenRing'', a hunter of [[TheUndead Those Who Live In Death]]. [[spoiler:His real name is Darian, which you can hear being uttered by his twin brother.]]

* ''LetsPlay/TwitchPlaysPokemon'':

** One notable character specific to TPP with a different letter is "d", the protagonist of ''LetsPlay/TwitchPlaysPokemonX'', also known as "Li'l d".

* The title character of ''LightNovel/VampireHunterD''.

* A from ''[[Franchise/{{Digimon}} Digimon: Digital Card Battle]]''. [[spoiler:It's a pseudonym]].

* The protagonist of ''Videogame/Cyberpunk2077'' goes by "V" regardless of gender. [[spoiler:A later mission reveals that it stands for "Vincent" (if male) or "Valerie" (if female) but they only let a select few use that name]].

* ''Franchise/{{EXTRAPOWER}}'': The warrior with the ore heart, V. At least his late sister Victoria is given a full first name.

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* Coach Z, from ''WebAnimation/HomestarRunner''. Didn't start out this way, as his name was spelled "Coach Zee" in the original book of ''Where My Hat Is At?'', presumably to prevent his name from being pronounced "Coach ''Zed''".
** In answering an email from Canada, Strong Bad reasons that Coach Z would be called "Coach Zed" there and decides to call him that in the future ([[NegativeContinuity Although he doesn't]]).
* Happens frequently in LetsPlay/TwitchPlaysPokemon, [[RunningGag especially with the letter A]].