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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ostans_2267.jpg]]

The ''OS-tan'' (short for Operating System-tan) is a MoeAnthropomorphism of various Windows operating systems (or at least that's how it started out), and is now a common feature on the Japanese Futaba Channel (where they originated). In fact, web browsers, antivirus programs, and other applications have gotten similiar treatment.

The -tan suffix is a deliberate mistranslation of the [[UsefulNotes/JapaneseHonorifics -chan suffix]], as it's supposed to sound like something said by a small child (hence evoking cuteness).

Originally, the first OS-Tan was Windows ME-tan, who was drawn as a cute {{Idiot Hair}}ed CuteClumsyGirl to represent how the actual Windows ME was highly unstable. Afterwards, several more Windows OS-tans were made, and eventually the premise exploded to making {{moe}} versions of almost every OS or popular piece of hardware in existence. The cult popularity of the OS-tan characters led to Microsoft Japan creating Madobe Nanami, [[AscendedMeme an]] ''[[AscendedMeme official]]'' [[AscendedMeme OS-tan]], as a spokesperson for Windows 7. Then there is Windows 10-tan with the name 'Touko Madobe", debuting around the release of the said operating system.

However, Windows 11 did not get its corresponding OS-tan mascot.

In fact, this little phenomenon even sparked a fake trailer for an anime series called ''Trouble Windows'', which has also been licensed as a name for artbooks depicting the OS-tans.

A video of the ''[[https://www.youtube.com/watch?v=jYlBuAvSzXk Trouble Windows]]'' trailer exists on Platform/YouTube. You can find an HD version [[https://www.youtube.com/watch?v=Z7JNNbvKj8o here]].

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!!Tropes:

%%* AloofDarkHairedGirl: Windows 2K-tan is often drawn this way, though XP-tan also has this look on occasion.
* AscendedMeme:
** Windows 7-tan was given an official personification, [[PunnyName Nanami Madobe]].
** Windows 8 has TWO of them, named Madobe Ai and Madobe Yuu.
** [[https://www.youtube.com/watch?v=BHTUlF7NA2o Internet Explorer 11]] has one as well in Inori Aizawa, complete with her own [[https://www.facebook.com/internetexplorertan Facebook page]]. She is the sister of several Japan-side mascots for Silverlight, the Aizawa Sisters.
** Speaking of the Aizawa sisters, there is Hikaru Aizawa, the personification of the now-defucnt Microsoft Silverlight application.
** Subverted with Windows 11, as to this date, no Windows 11-tan has surfaced. (so fans have to create her themselves)
* BigEater: XP-tan often is shown holding up a big rice bowl labeled "Memory".
* BrotherSisterIncest: Homeko (XP Home Edition) has a crush on her SpearCounterpart brother "Homeo".
%%* CanonForeigner: Windows 1.0, 2.0, and 3.2 (Chinese 3.1) -tan are regarded as this in fan works. - Might need more expansion. Also, I have never seen a Windows 3.2-tan
* CatGirl:
** Windows 2000-tan's hair clips make her look like cat, though she doesn't have a tail.
** The latest Platform/MacOS-tan's are all {{Cat Girl}}s due to their production codenames.
* CuteClumsyGirl: Inori Aizawa was a klutz when she was younger.
%%** ME-tan, representing how the system was liable to crash.
* DepravedBisexual: Dr. Norton (Antivirus) is drawn as an ugly perverted ghost (after the Norton Ghost program) who keeps trying to ogle the Windows-tans, or make them undergo {{Creepy Physical}}s that represent invasive deep system scans, at every opportunity, with XP-tan being his preferred victim. He also has an implied fetish for Bill Gates.
%%* ElegantGothicLolita: How Windows 3.1-tan is often drawn.
%%* {{Expy}}: Windows ME-tan looks and dresses like [[ArtificialIntelligence Canal Volfeed]] from ''Literature/LostUniverse''. - Needs better explanation
* CuteKitten: Windows 3.1-tan is always depicted holding a cute black kitten labeled "DOS".
* FanGirl: Windows CE-tan is a big InUniverse fan girl of the Platform/{{Dreamcast}}, as a variant on the CE OS code was used as the Dreamcast BIOS.
* {{Fanservice}}: Most of the girls wear flattering clothes that show off their figures, and their character design and lore is heavily steeped in technical geekery and trivia about the operating systems they all represent. Some of the wordplay in their design and lore is for both innocent and naughty fun, like Inori's [[DoubleEntendre "Quick Access" belt]] that is based on the corresponding feature for her browser, or the fact that the girl's bust sizes often correspond to their memory consumption, which is why XP is often portrayed to be top-heavy.
%%* FieryRedhead: Windows 95-tan when mad.
%%* UsefulNotes/FurryFandom: What the web browser Firefox and its companion email client Thunderbird are designed after. - Is this an example?
* GirlWithPsychoWeapon:
** SE-tan and her can opener, wielded with intent to castrate.
** Mac OS gets explosively violent when faced by the Windows girls, throwing bombs at them.
* HairTriggerTemper: Mac OS-tan is notorious for her violent outbursts when she comes face to face with the Windows-tans, hurling {{Cartoon Bomb}}s at them out of spite. Even when she isn't battling her rivals, she shows [[PervertRevengeMode little-to-no patience]] when dealing with the male Futaba characters perverted antics.
* {{Hermaphrodite}}: Windows 98 and 2K-tan are occasionally depicted as Futanari in hentai doujinshi.
* HospitalHottie: Miss [=McAfee=] (Antivirus) and AVG (Antivirus), who are both drawn as attractive, with the former being drawn as a monocled British woman and the latter as a good-looking male student doctor.
* HumongousMecha: Windows 98 and 98SE-tan commonly ride around in ones that resemble snack boxes.
* ImprobableWeaponUser:
** ME-tan often uses a leek for self defense.
** Both 98-tan and SE-tan use a can opener when in danger.
* KatanasAreJustBetter: Windows 95-tan's katana represents her dominance over all rival systems of the time.
%%* LadyOfWar: Windows 95-tan
* MagicalGirl: Inori Aizawa's [[https://www.youtube.com/watch?v=BHTUlF7NA2o promo video]] features her [[TransformationSequence transforming dramatically]] before fighting robots that either represent malware or rival browsers.
%%* MoeAnthropomorphism: Usually as a cute girl or woman, though male versions exist. - Needs better elaboration
* PunnyName:
** Nanami Madobe means [[ExactlyWhatItSaysOnTheTin "Windows 7"]].
** NT-tan (NT 3.1/3.5/4.0) is called Inut-tan, as the pronunciation is very similar to the Japanese word "Inu", which means dog. In fact, NT-tan is often drawn as a cheerful girl with dog ears.
** '''Ai'''zawa '''I'''nori, pronounced "I E".
** Microsoft's Azure Cloud service is represented by '''Claud'''ia.
* SeriousBusiness: Windows 95-tan, in reference to how Windows 95 started off Microsoft's opening shot in its war to outdo Macintosh, gets downright KnightTemplar when it comes to fighting Platform/MacOS-tan's.
%%* SevenIsNana: For Windows 7, of course.
* ShownTheirWork: Inori's character design and lore references vast amounts of Internet Explorer lore. Her shoes have Trident markings on them, referring to the Trident browser rendering engine used in IE. Her anime trailer features the other Microsoft-created mascots as well, with a faded Nanami Madobe poster appearing early and Ai and Yu Madobe dolls on her desk in the ending. Even her ''birthday'' and personal history correspond to Internet Explorer's actual launch date and such.
%%* ShrinkingViolet: Windows 3.1, DOS-tan and Linux-tan are depicted like this.
* SignatureHairDecs: Nearly all the -tans have hair accessories, usually a cute stylized version of the logo of what they represent.
* SpearCounterpart: Many OS-tan's originally drawn as girls have male counterparts.
%%* {{Stripperific}}: Chiivistan, due to the fact her clothes are transparent, in reference to the "Windows Aeroglass" theme.
* StuffBlowingUp: Platform/MacOS-tan uses bombs as an attack.
%%* TeamMom: Windows 95 and 2K-tan assume this role for the Windows OS-tans.
%%* YaoiFangirl: Homeko-tan.
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