Ascended Fanon: As with most Tokusatsu fandoms, Kamen Rider fans divided the franchise up into distinct periods based off of eras of the Japanese calendar. However, rather strictly following the official calendar (the Heisei era began in 1989, midway through Black RX's run) it's tied to creator Shotaro Ishinomori: works made while he was alive are considered Showa and those made after his death are Heisei. Toei took this to heart, officially classifying the movies made in the 90s as Showa when it was time for the two eras to throw down in Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai. Kamen Rider Zi-O took it a step further, with The Movie featuring villains based off of "lost Heisei" productionsnote Works made during the actual Heisei era that are not officially considered "Heisei Rider" worksBlack RX, the 90s movies, and Amazons while the stage show had the Riders from The First and The Next (modern reboots of the original series and V3) and Amazons identify themselves as "Showa Riders who belong to the Heisei era".
Cowboy BeBop at His Computer: The subtitle translation work for the Southeast Asian release of recent Kamen Rider films have shown that the translators don't do research on the series' context in general; while most Transformation Trinket announcements went untranslated, those that do get translated became serious mondegreen that were published as they were heard. Notable examples include:
In Kamen Rider: Reiwa the First Generation, Shooting Wolf's activation was literally translated as "Barette", while Rushing Cheetah's became "Meteor" despite the original wordnote Dash sounding nothing like it.
Seiji Takaiwa is known to the fans as Mr. Kamen Rider due to the fact that he's been the suit actor for nearly every Hesei Rider (He didn't act Kuuga and Hibikinote he was busy as Timered and Magired respectively while those shows aired). Considering the fact that he's somehow managed to choreograph 14 different personalities, making them recognizable characters even behind the suits, he definitely deserves the title.
Western fans also have coined the term "Rider Bros" for Rider veterans who still look back on the show fondly, reprise their roles in crossovers and video games, and are generally friendly and receptive with the fandom. Considering the franchise has been running long enough to produce a ton of Promoted Fanboys, the list is quite expansive.
Hey, It's That Place!: Some locations are not only repeated in the same season, but occasionally will repeat in multiple seasons.
This might as well as be called "Hey! It's that Gravel Pit!", as it applies to Tokusatsu, Because both Kamen Rider AND its sibling Super Sentai have, for the past few years, made use of the same gravel pit for every big mass battle they have, to the point where Hikonin Sentai Akibaranger, a parody of Super Sentai intended for the adult periphery who grew up watching Sentai as kids, made use of it in their first episode.
There is also a particular rooftop that has seen use in basically every Heisei-era Rider series.
One particular warehouse got used so often in Zi-O that it must have been a running gag - and then Zero One kept on using it as well. It had been used previously in other seasons, but no to the extent these two have.
Ex-Aid had the justification of an exceptionally rare non-video game case of Gameplay and Story Integration: the Riders could select what "stage" they wanted to fight in, being the same seaside dock, gravel pit, and park locations that have been used extensively in the franchise for years.
Late Export for You: With Shout Factory finally getting the license to distribute the series in the US, the original and Kuuga got released decades after their initial airing in Japan - 50 for the original, 20 for Kuuga.
Name's the Same: There is slight difference in how the names are punctuated but the first enemies Kamen Rider fights are called Spider Man and Bat Man. (Less so in Japan, where the monster names are in Japanese, but the comic book heroes' names are in English.)
The series had been brought out to the Asian market, with mainly a Cantonese dub for the Heisei Riders currently airing in Hong Kong complete with some of its movies. There was also English dubs produced for English-speaking Asian countries produced by Voiceovers Unlimited in Singapore, before the company was shut off and the production was passed on to a Hong Kong-based company. It started from Ryuki and had mostly continued (Hibiki and Kiva were skipped over) up till Wizard, however it was played straight for all series beyond Wizard ever since.
Malaysia had a unique case where a Malay dub for Build was aired right after Wizard, skipping all other seasons in-between.
A media company named Purple Plan managed to bring the Heisei Generations FOREVER movie out to some Southeast Asian cinemas in 2019 in English subs. Due to the positive response garnered, they have also since exported all subsequent Kamen Rider films.
Played straight that the Philippines didn't get any AT ALL outside of Clips. Pinoy Kamen Rider fans are not pleased. Fortunately, there's You Tube.
As of 2020, this was averted both by Shout! Factory running subtitled episodes of the original series in the United States and Canada with the Pluto TV channel TokuSHOUTsu, and by Toei themselves starting up a Youtube channel where they upload episodes of their Tokusatsu and anime classics from the 70s through the 90s. Kuuga, notoriously difficult to watch due to Toei's very specific legal action against streamers and torrenters being laser guided at this one series while leaving all others alone, even made it onto the Shout Factory site.
Out of Holiday Episode: A uniqueness of their mutual seasons means that while Kamen Rider and Super Sentai normally do feature a Christmas Episode, the tone of each episode is completely different. Kamen Rider season premiere in mid-October and Super Sentai premier in Mid-February. Given the serial nature of each show, Kamen Rider's Christmas episodes tend to fall right around the time of a much needed breather episode and typically feature some light-hearted plot (in fact, the dark twist at the end of Kamen Rider Ex-Aid's plot was exceptionally notable and had a more than a few complaints). Conversely, while Super Sentai tries to get a breather in if it can be worked, the Christmas Episode falls right around the final 10 episodes of the season, with the results typically being darker as they are now in the build-up phase to the finale.
Promoted Fanboy: Given the series' status as a Long Runner, more and more actors playing Heisei Riders grew up watching Showa and early Heisei Riders.
The greatest among these has to be Ryouta Murai, who grew up watching Kuuga, and got to be Kuuga for Kamen Rider Decade.
Similarly, Gaku Sano, actor for protagonist Kouta Kazuraba, grew up watching Kuuga and wanted to become a Kamen Rider when he grew up. Having snagged the role of Gaim, he stated that he wants to invoke this, inspiring a new generation of fans for the series.
Shunsuke Takasugi (Super-1) and Shigeki Hosokawa (Hibiki) are both fired and blacklisted from their agencies - the former due to scamming his fans out of 50 million yen and disappearing in early 2017, and the latter due to sexual abuse accusationsnote Though Hosokawa swore not to return following the Executive Meddling that Hibiki suffered, he apparently reversed his stance a decade later to reprise his role for Battride War Genesis shortly before his blacklisting.
Joe Odagiri (Kuuga) is an interesting example — though he didn't hate his time as Kuuganote He doesn't list it on his website but that's only due to it not being his debut role; since he was acting in a lot of other things, he doesn't have everything listed and was up for reprising the role in the summer movie that never got made, Odagiri famously isn't a fan of Tokusatsu as a genre and only took the role as a favor to producer Shigenori Takatera. However, Takatera was fired following the Troubled Production of Hibiki, meaning Odagiri had no interest in reprising the role (hence the reason Kuuga is the only show not to get a tribute in Zi-O).
Kamen Rider has served as a launchpad to stardom for several of its actors, which has the downside of rendering them too busy (or too expensive) to return to the franchise even if they want to do so. Some prime examples of this include Takeru Satoh (Den-O), Masaki Suda (W's Philip), Sota Fukushi (Fourze) and his co-star, Ryo Yoshizawa (Meteor), Mahiro Takasugi (Gaim's Mitsuzane) and Ryoma Takeuchi (Drive). That said, Toei does pull off miracles sometimes: Satoh returned for Zi-O's Heisei Generations Forever and Fukushi returned for Build's Heisei Generations Final (and would have been in Zi-O itself, had he not been tied up filming Bleach; he still managed to record voice-overs).
A partial case with Kou Domon (ZO) - while he hasn't said he would be opposed to returning, nor has he had any legal troubles, his actor has seemingly disappeared off the face of the planet, having last been reportedly seen in Indonesia.
The Riders' signature motorcycles have been hit by this trope a few times over the franchise's run, mostly due to safety concerns. This includes Toei requiring all Rider actors to be licensed drivers (after Skyrider star Hiroaki Murakami accidentally drove the Sky Turbo into a wall), the phasing out of Showa's iconic Scarves of Asskicking, and the diminished role of motorcycles in general in the Heisei era (this last example coupling with filming restrictions).
Real Life Writes the Plot: The reason Hayato Ichimonji/Kamen Rider 2 exists is because of this trope - Hiroshi Fujioka was involved in a motorcycle accident while he was doing his own stunts, and while he was recovering, the producers chose to create another Kamen Rider with a different suit. Once Fujioka recovered, rather than write Hayato out of the show, the writers kept him around, albeit eventually putting him on a bus so that Takeshi Hongo could be the center of focus again.