Ascended Fanon: The common Fan Nickname when talking about Riders before the year 2000 are called Showa Riders, while Riders afterwards are named Heisei Riders. Toei took the naming to heart and thus called Riders 1-J the 'Showa Riders' and Riders Kuuga-Gaim the 'Heisei Riders' when it came time for the two to clash. The Movie for Kamen Rider Zi-O goes further and references how the franchise has its own definition of Showa and Heisei by introducing three Riders that are based on Riders that are technically Heisei Riders but aren't considered as such; two of them, Barx and Zonjis, represent Kamen Rider BLACK RX and the three 90s movie Riders respectively. Based on the real world definitions of Showa and Heisei, all four should be considered Heisei Riders, but aren't because the death of Shotaro Ishinomori and the debut of Kamen Rider Kuuga are more important to the franchise.
Fan Nickname: 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.
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. There was also English dubs produced for English-speaking asian countries such as Singapore, starting 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.
Another media company still managed to bring the Heisei Generations FOREVER movie out to Asian cinemas in 2019 in English subs.
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, whit 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.
Real Life Writes the Plot: There's a fair number of actors who, for whatever reason, are unable to/unwilling to reprise their roles, and as such, are portrayed by a Fake Shemp in any future appearances.
Takehisa Yamaguchi (Riderman), Shigeru Araki (Stronger), Kyoko Okada (Tackle), Gorō Naya (The Great Leader), Masayuki Izumi (Yuji Kiba), and Akiji Kobayashi (Tobei Tachibana) have passed away.
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 50m Yen and disappearing in early 2017, and the latter due to power strugglesnote it's worth noting that due to the Executive Meddling that Hibiki suffered, Hosokawa swore not to return anyways, meaning he'd likely be on here anyways but under a separate bullet point if he wasn't blacklisted.
Joe Odagiri (Kuuga) is an interesting example - although he does dislike Tokusatsu, he did not 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, but due to the producer he took the role as a favor for (Shigenori Takatera) being fired during the Troubled Production of Hibiki, he 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 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.
Real Life Writes the Plot: The reason Kamen Rider Nigo 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 Nigo 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.