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The Deuteragonist trope really is a staple of the 21st century Kamen Rider series, all of them have a secondary protagonist who provide as much if not more importance to the storyline as the titular character from their respective series. These second protagonists aren't necessarily the Second Riders that are another staple of the franchise and many aren't even Riders in the first place.

  • Kamen Rider Agito: Agito is a bit difficult since it technically has two secondary protagonists, neither of whom is really that much more relevant than the other; Makoto Hikawa/Kamen Rider G3 and Ryou Ashihara/Kamen Rider Gills.
  • Kamen Rider Ryuki: Ren Akiyama/Kamen Rider Knight. Arguably, the Trope Codifier of the franchise. While Kaoru, Makoto and Ryou had their fair share of screen-time, Ren is the first deuteragonist in the franchise to really be presented as equal to the protagonist in terms of narrative importance. Case in point, he outlives Shinji in the finale, and remains to date the only secondary Rider to face the season's Final Boss instead of the protagonist.
  • Kamen Rider 555: Yuuji Kiba/Horse Orphnoch/Kamen Rider Orga. Notably, he receives more attention in the first episode of the series than the protagonist himself. He also remains to date the only supporting character in the entire franchise to exclusively take on the role of the primary Rider for four entire episodes.
  • Kamen Rider Blade: Hajime Aikawa/Kamen Rider Chalice/Joker Undead. It's enough that despite officially being the third Rider to appear in the series (with Kamen Rider Garren being the official secondary Rider), various media has treated him as the "actual" secondary Rider, and his battle with Kenzaki is ultimately what concludes the series.
  • Kamen Rider Hibiki: Asumu Adachi. More precisely, it is Asumu who is the protagonist, and Hibiki who is the deuteragonist. This is because the show is largely more concerned with Asumu's experience with the Oni rather than Hibiki's battle with the Makamou.
  • Kamen Rider Kabuto: Arata Kagami/Kamen Rider Gatack. Similarly to Asumu, he is the viewpoint character for the majority of the show, starting off as The Watson to Tendo before eventually becoming The Rival to Tendo once he becomes Kamen Rider Gatack.
  • Kamen Rider Den-O: While the Imagin arguably serve as this collectively for the series, Momotaros being the first Imagin to bond with Ryotaro puts him far above the others. In further continuations of the Den-O story, it is almost always Momotaros, not Ryotaro, who transforms into Den-O and he has more or less become the face of the Den-O franchise as a result.
  • Kamen Rider Kiva: Otoya Kurenai/Kamen Rider IXA/ Kamen Rider Dark Kiva. Being a show split between events occurring in 2008 and 1986, Otoya plays the lead role in the latter time zone.
  • Kamen Rider Decade: Natsumi Hikari/Kamen Rider Kivala. While never becoming a Kamen Rider in the show itself, she's the character the story follows the most after Tsukasa. That the fact she becomes the Kamen Rider that strikes down Decade and restores all of the worlds in the movie only solidifies her status as this.
  • Kamen Rider Double: While both are technically the protagonists, Shotaro Hidari primarily serves as the viewpoint character which makes Philip the Deuteragonist by default.
  • Kamen Rider OOO: Ankh. He gets a character arc that runs throughout the whole series, making it just as predominant as Eiji's own. In fact, his role is so important to the story that the form used to fight in the Final Battle is the one that uses his Core Medals, the Tajadol Combo, instead of the title character's Super Mode.
  • Kamen Rider Gaim: Kaito Kumon/Kamen Rider Baron. The focus on Kaito's narrative journey and importance to the story is only second to Kouta's as it showcases how he goes from The Rival to the Big Bad the show's protagonist must defeat in the climactic final battle. The role of the tritagonist belongs to Mitsuzane "Micchy" Kureshima/Kamen Rider Ryugen, who without a doubt, as he easily receives the most Character Development out of the main cast, and the show's epilogue concludes with both him and Kouta fighting side by side after resolving every issue between them. The position of the tetragonist is given to Takatora Kureshima/Kamen Rider Zangetsu, who is Micchy's older brother and is given significant spotlight as he tries to contain the dangers and mysteries of the Helheim Forest, the place that grants the Kamen Riders their powers.
  • Kamen Rider Ex-Aid: Poppy Pipopapo. Ex-Aid may largely be ensemble with how it handles its characters, but Poppy is Emu's companion from the very start and is pivotal to many of the developments that occur later on, such as getting Kuroto to work with CR and stopping Kamen Rider Chronicle.
  • Kamen Rider Build: Banjou Ryuga/Kamen Rider Cross-Z. A key point of the show is how his friendship with Sento helps build each other up to ever greater heights. He also tends to steal the spotlight from Sento to the point where one could mistake him for the main hero at times.
  • Kamen Rider Zi-O: Geiz Myokoin/Kamen Rider Geiz's relationship with Sougo as well as the question of who will become the King or the Savior is the main conflict in the first half of the series. Even once they resolve their conflict, Geiz and Sougo's relationship continues to be a prominent point of the series, with Geiz's Heroic Sacrifice in the end being what pushes Sougo to become Oma Zi-O.
  • Kamen Rider Zero-One: The deuteragonist is Is, a Robot Girl who learns how to truly feel and wholeheartedly go after her dreams and whose death kicks off the series' endgame. In The Movie, she even ends up being revived and transforming into Kamen Rider Zero-Two. Isamu Fuwa/Kamen Rider Vulcan is the tritagonist as alot of the show focuses on him growing out of his Fantastic Racism, to the point of him receiving more Character Development than even Aruto.
  • Kamen Rider Gavv has Hanto Karakida/Kamen Rider Valen, who is the second most important character of the story and has plotlines that run parallel to Shouma's.

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