Kujibiki♡Unbalance was originally a fictional manga/anime within Genshiken that the main characters were obsessed with. When Genshiken's anime adaptation was released on DVD, three episodes of Kujibiki Unbalance were included as OVAs (which are meant to be the first episode, a Clip Show, and the second-to-last episode of the fictional anime), and later on it was remade into a real TV anime that follows a different continuity than the OVAs. When the characters within the original watched the real series the changes were incorporated back into the show! Later on, when the retooled Kujiun anime got a manga adaptation, it included a bonus omake chapter of Genshiken where they discussed the retooled Kujiun series becoming a manga and the changes made to it, including a Lampshade Hanging ("Who the hell is Kio Shimoku?").
Sheryl Nome and Ranka Lee's microphones from Macross Frontier are available products, and not only can they play their respective singer's songs, but they also have duet functionality with each other.
The fictional girl group Walküre from Macross Delta is now a legit group, with Minori Suzuki and JUNNA as its lead singers (but not as their characters though but themselves), with Kiyono Yasuno, Nozomi Nishida and Nao Tōyama (Kaname, Makina and Reina respectively) also part of the group.
In 1995, Studio Ghibli released a movie, Whisper of the Heart about a girl struggling to write a fantasy novel. The movie included short vignettes from various scenes she was struggling with. Sure enough, due to popular demand the book-within-the-movie got its own movie in 2002, titled The Cat Returns. (Though the plot of The Cat Returns is actually quite different from what was hinted at in Whisper of the Heart. The only big thing that remains the same is the Baron.)
Which is interesting as, during the period when Ghibli films (specifically Miyazaki) were a big thing, The Cat Returns was constantly shown as a trailer with other Disney/Ghibli films, while Heart or its connection is never mentioned at all.
Minami-ke have Chiaki's stuffed bear Fujioka involved in many gags. Good Smile Company eventually made a real life version of that teddy bear.
Back when the manga revolved around The Other Yugi punishing evildoers with deadly games, Seto Kaiba was just another one-off villain. The "Magic & Wizards" card game was introduced for that one story, with Kaiba resorting to dirty tricks in order to steal Sugoroku's rare Blue-Eyes White Dragon card; when Yugi calls him on it and Kaiba refuses to return the card, things get ugly and The Other Yugi challenges Kaiba to a Shadow Game version of Magic & Wizards. Of course, Kaiba and the M&W card game became popular enough to make a comeback later on, and eventually they not only took over the entire premise, but also spawned a merchandising powerhouse.
They also tried that with Dungeon Dice Monsters, but with much less success. Probably 'cause of the limited selection of monsters and the hassle of finding another player of the game. The Gameboy Advance version sold a bit better.
Bandai Hobby released a replica of the Millennium Puzzle as part of the Ultimagear line, allowing fans to have a crack at the puzzle itself. Just like the source material, there's no instructions on how it comes together. The instructions packed in is just the assembly guide for each individual piece of the puzzle, due to its model kit nature.
At one point, there were real-life Duel Disks based on the ones from the anime and manga. Unfortunately, these were rife with a bevy of problems, apart from the lack of holographic imagry. The slots that held the cards were too small for sleeves, meaning bending or ripping the cards would have been inevitable. There was also the fact that they didn't give you a good view of each other's fields, meaning your opponent could try to pull a fast one on you. There's also the fact that their size and weight meant you'd have insane wrist cramps afterwards. Ultimately, they were discontinued.
The "City with No People" book series in CLAMP's manga Chobits had the first two books published in a set, complete with a read-along CD by Chi's voice actress.
×××HOLiC invokes the trope In-Universe. There is an early chapter where Yuuko is showing Watanuki around her shop's storeroom. On one shelf is the Clow Wand from Cardcaptor Sakura, but then Yuuko reveals it to be just a mass-market light-and-noise-making toy replica.
Anything Pokémon related, usually in reference to the anime. More recently, Ash's Pikachu, Ash & friends' Pokémon sent over Wi-Fi, eggs, etc.
The hat Ash constantly wore in the first few seasons of the anime was sold as a real hat after the show took off internationally. This extended to his later hats.
Naoki Urasawa made a real issue of the series that Those Two Guys are frequently seen drawing in 20th Century Boys, featuring huge amounts of Stylistic Suck. The iconic song Kenji sings on the street has also been recorded, sung by the manga-ka, no less.
JoJo's Bizarre Adventure - A piece of the Impossibly Cool Clothes is now available thanks to a Japanese clothing company; Yoshikage Kira's swank tie with the horned skulls. It's reportedly expensive, so one would be advised against using it for cosplay. It is for sale on Amazon.comnote Though this is liable to change in the unforeseeable future. for ~$414 USD. Crack is Cheaper indeed.
Gundam has a big history of the series getting defictionalized stuff in some of its seasons. These include:
Mobile Suit Gundam - A 1/1 scale model of the RX-78-2 Gundam which can move its head around was created to celebrate the series's 30th anniversary. There is also an actual institution that is researching a real-live Psycommu. It even has "New Type" in its name. "Gundam" is also a fairly popular secret Code Name for in-development military projects. The RX-78-2 was replaced with its spiritual and current ultimate successor, the RX-0 Gundam Unicorn, in March of 2017. This was latter topped by the RX-78F00 Gundam and its Gundam Dock at the Gundam Factory Yokohama, which does have moving limbs, and shows how big an actual Gundam would be in real life.
In 2020, Bandai defictionalized Gundarium, the Unobtainium used to make the RX-78-2 Gundam and many other mobile suits, for a limited edition model kit of the Gundam. In this case it's an alloy of titanium, aluminum, and yttrium, though unlike its original name "Luna Titanium" it doesn't use any materials from the Moon. It still costs around $2000 USD, though.
In Mobile Suit Zeta Gundam, the Mobile Suits of the AEUG descended to Jaburo via a special parachute-like device known as a Ballute. In 2017, scientists created and proclaimed success of a similarly-themed device for spacecraft and seek to make some for space shuttles.
A blue and white striped bowl went on the market after K-On! ended. It brings some... interesting implications as the bowl was featured as a Panty Discretion Shot.
The same thing happened to an audio cassette that the characters "recorded" at the end of the second season.
One of the more brain-tickling examples, the Laughing Man from Ghost in the Shell: Stand Alone Complex and his trademark smiley symbol, both identified as memes and used to examine the phenomenon within the show, have become memes in real life as well, appearing on sweatshirts, bags, and message boards. And Lazy cosplayers. You'd be surprised how effective a paper mask of the logo over a hooded sweatshirt actually works.
And what about the technology? Japanese scientists have created metamaterials that make things invisible by refracting light around the object.
In Junjou Romantica, Usagi writes BL novels using his own experiences and fantasies as inspiration. Naturally enough, some of the novels were written for real under the series title Junai Romantica.
Lucky Star creator Kagami Yoshimizu's former home in Satte, Saitama, Japan was since reformed into a replica of Konata's house with a few museum exhibits. Look foryourself.
Not to mention any number of zanpakutō, more commonly in their shikai form (as their normal form is a simple katana with a stylized tsuba (handguard); no functionality though (Renji's is frequently sought after)
In Demon Slayer: Kimetsu no Yaiba, at the end of the series it is mentioned Zenitsu chronicled his life and that of his friends in a personal memoir book titled Zenitsu-den / The Legend of Zenitsu, with contents of said book implied to be heavily dramatized and biased towards making Zenitsu more heroic than he ever was in reality, also making his friends look less impressive while at it. In an art gallery exhibition called Koyoharu Gotouge Exibition which started its tour in Japan in October, 2021 a partial version of Zenitsu-den was produced for attendees to read in the exhibition, it contained a few full chapters of the book written from Zenitsu’s perspective and a table of contents, with titles for all 25 chapters The Legend of Zenitsu ended up with as Zenitsu finished writing it in his elderly years.The Table of Contents in Zenitsu-den 1. The Birth of Zenitsu Arc / 2. The Demon Slaying Arc ~Fated Encounters~ / 3. The Heavenly Maiden Arc ~I Am Willing To Die For You~ / 4. The Tastiness of Nezuko-chan’s Cooking Arc / 5. Warring States Nezuko-hime Arc / 6. The Life of the Man Who Loved The Spirit of the Plum Tree Arc / 7. Zenitsu the Ninja Arc ~Love Like A Flash of Lightning~ / 8. Battling the Boar ~The Leaves of Darkness Flutter~ / 9. Beautiful Swordswoman Nezuko Arc / 10. The Golden Dragon Wandering Alone Arc ~Go And Rescue Nezuko!~ / 11. Ohagi from Zenitsu Arc / 12. Rumble of the Knock-Out Secret Swordsmanship of Zenitsu Arc ~The Legendary Man’s Eyes Shine With Light~ / 13. The Potato Feudal Lord Arc / 14. Little Mouse-Boy Zenitsu Arc / 15. The Dragon Palace Arc ~Eternal Nezuko~ / 16. Sitting In A Happy Circle and Boiling Tea in Our Bellybuttons Arc / 17. The Future Holds Zenitsu Arc / 18. Pianist Zenitsu Arc ~Nezuko Like Raindrops Dripping from the Eaves~ / 19. The Gods’ Shrine Maiden Nezuko Arc / 20. Zenitsu Makes A Fortune in A Single Stroke, Wahaha! Arc / 21. Life or Death Struggle! Zenitsu the Heavenly Arc / 22. Big Romance Glittery Zenitsu Arc / 23. Master Zenitsu Arc ~The Appearance of a Great Teacher~ / 24. I Will Be In Love With You A Thousand Years Arc ~Again, Even If We Are Reborn~ / 25. The Life of Happiness Arc ~With Everything Based On The Truth~. In his elder years Zenitsu grew wiser and chose to dedicate the last chapter of his book to telling the historical truth of what transpired in his life and of that his friends.
Durarara!! has an in-universe example where Walker and Erika have managed to defictionalize Darker than Black protagonist Hei's trademark grappling knives, complete with a miniature generator to mimic his Shock and Awe powers for the purposes of torture. In the real world, fans actually made a 'Dollars' board, complete with password and everything. (It's actually more along the lines of a fan forum, however.)
There's also a chatroom that's designed exactly like Durarara's chat. Unsurprisingly, a majority of the users use it to RP sex, yaoi, yuri to a far lesser extent, and to rp anime, and to rp anime-like scenarios including DRRR itself.
Arguably the internet group Anonymous could be seen as a real life counterpart to the Dollars.
In the "Mother's Rosario" arc of Sword Art Online, Kirito invents a "Bi-directional Probe" to give Yuuki, an Alfheim Online player confined to a hospital due to AIDS, a chance to experience life in the real world. Similar technology has been invented since that gives ill people a chance to experience life beyond the confines of their sterile environments, with one of the most prominent examples being for Ironmouse, a chronically-ill and physically-disabled Virtual Youtuber, who was able to attend an anime convention with her friend CDawgVA, via a specially-constructed remote-controlled drone.
Space Travelers: The Animationnote not related to the re-branded version of Marooned seen on Mystery Science Theater 3000 was produced as a spinoff for a live action caper comedy also called Space Travelers. The gimmick was that it was the Show Within a Show that inspired one of the main characters of the live action film, a wannabe bank robber, to talk his partners in crime, and the hostages in the bank who quickly suffered Stockholm Syndrome, to adopt the personas of the show's characters while negotiating with the cops, so everyone starts to Become Their Mask while planning to escape. Media Blasters licenced the anime movie, but without the tie-in to the live-action movie, or any reference to it, all they had was a Sci-FiCliché Storm and a cast of awesome names.
In MÄR, the characters use magic powers through the use of accessories called ARMs. These same ARMs were then sold as part of the MAR Heaven Card Game in real life, although presumably sans magic powers.
The protagonist of Sakende Yaruze! is a voice actor for an anime called "Diet Girl Miyuki." Afterwards the mangaka turned Diet Girl Miyuki/Miracle Dieter Miyuki into its own manga.
Hell Girl — The "real" Hell Correspondence website. By the way, it doesn't work. If you watch the show, you should know that the process goes like: 1) Enter Target Name. 2) Click 'Submit'. 3) Ai Enma appears to give you the black straw doll with red string. 4) You pull the string. 5) Target goes to Hell. The site only goes until Step 2, so there's no black straw doll, so you can't send your target to Hell. So you need not fear having a certain black mark put on your neck setting you on the path to hell.
Otter's 11, a rival manga in Baku Man had a single chapter published in an issue of Shonen Jump, credited to Kazuya Hiramaru, the in-universe author.
The follow-up series, ''Kirakira Happy! Open! Cocotama!" has an actual toy of the key used by Haruka.
There's a real life Prism Stone shop in Harajuku just like the ones seen in the Pretty Series It sells clothes based on the ones the characters in both series wear, as well as character merchandise. You can also play Pretty Rhythm, PriPara and Kiratto PriChan there.
They also made items based on items shown in the anime versions of the Pretty Series:
Pretty Rhythm only had five items, which were the Batopons from Aurora Dream, the Smart Pods the girls use in Dear My Future and Rainbow Live and the headphones and guitar used in the Rainbow Live series.
PriPara has many items from the show that were fictionalized, which include the file bags the girls carry their PriTickets in, the PriPass cellphones that initiate Cyalume Change, the microphones the idols use note There are five different types, which include a series of candy toys, a Gashapon set, a set of plush pencil cases, a set of Happy Meal toys based on the microphones and a battery-operated toy similar to the aforementioned Yo-Kai Watch which reads heart-shaped jewels. the Cyalume Charm, the Miracle Pact, Aroma's spellbook, Mirei's penalty tickets, the student handbook from Paparika Academy, the closet trunks, the Rosette Pact, the Cyalume Tact, the Idol Time Mic, the Idol Watch, the Idol Harp, Takki, Falulu's Non and the doll Hibiki uses to avoid embarrassing situations.
For Kiratto PriChan, Prism Stone Harajuku opened up a PriChan studio for fans to record videos up to 30-minutes long that will play on loop throughout the store. They also made the PriChan Casts, Yattemita Appli, Jewel Pact and Design Palette into real toys.
The umeboshi pizza was served at an Animate cafe to promote season 3 of the show.
Bushiroad produced, as prizes for Cardfight!! Vanguard tournaments in Japan, deck holder boxes designed after the ones used in the anime (which are open at the top instead of being fully closed as usual deck holders are) and replicas of the gaming mat seen in the anime (Ultrapro made something similar for western countries, but it's larger, it's missing the slots for deck, discard pile and damage zone, and it's available only with the Vanguard circle in red while the Japanese release comes both in red circle and blue circle variants).
The titular Giant Robot from Mazinger Z was made out of a metal called Japanium. Years later, there's now an element speculated to be a metal known as Nihonium (Nihon being the Japanese name for Japan).
Yuri!!! on Ice: Among the many, many merchandise options for the show, you can buy Yuri's Makkachin tissue box.
Not tangible, but History Maker (the theme song for the show) was played at the opening ceremony of the 2017 Grand Prix Final.
Following the success of Keijo!!!!!!!!, groups have popped up in Portugal and Poland that mimic the titular sport.
There's a charity group called Akatsuki Afkar in Indonesia, which members do charity work wearing Akatsuki gear.
At Spirit Halloween stores, you can buy various replicas of items that appeared in the Naruto series, including Obito/ANBU masks, shinobi headbands, Akatsuki/Hokage cloaks, Naruto's jacket and even Zabuza's sword.
Some of the clothes worn in Aikatsu! were available for purchase in real life at Aikatsu Style shops.
Over 4500 of Doraemon's gadgets have been defictionalized by scientists! Don't believe it? Here's proof.
Hunter × Hunter: Want to test your skills playing Gungi but you missed out buying the ones released with the limited edition Japanese blu-ray set years ago? There's now an official Gungi game set finally available for sale to the public, with actual rules implemented, with beginner, intermediate and expert levels to choose from.