A mediocre photographer with no memory of his past.
The Ace: He's good at everything - except taking pictures.
All There in the Manual: A couple of books have shown cards that were made but never used, including Form Rides for Den-O Rod, Gun, and Wing, and another Attack Ride for Den-O Ax. *
Evil Costume Switch: Decade Violent Emotion/Fury Form is a bit more subtle about it, with the main suit being a slightly darker magenta and the helmet having a purple O-Signal (instead of yellow) and vaguely flame-shaped eyes.
Face Heel Turn: Three times! In All Riders vs. Daishocker, he becomes Daishocker's Great Leader, in the final episode and Movie Wars he finally accepts his role as the Destroyer, and in Superhero Wars he, along with Captain Marvelous, instigates the war between Riders and Rangers.
Finishing Move: Because Decade can transform into past Riders, he can also use their finishing attacks.
When using his own Final Attack Ride card, his finishers all involve generating large golden Final Attack Rider cards that Decade goes through to destroy the enemy.
Dimension Kick
Dimension Slash
Dimension Blast
Decade Complete Form: Enhanced Dimension Kick*
The Climax Heroes fighting game shows an alternate version where the opponent is transported to a projection of the Rider Multiverse and instead of cards, Decade leaps through the emblems of the nine previous Riders (with Decade's emblem appearing behind the enemy to hold them in place).
Final Form Ride finishers
Kuuga Gouram: Decade Assault*
Kuuga Gouram grabs the enemy and flies them towards Decade, who executes his own version of the Mighty Kick.
Kiva Arrow: Decade Fang*
The Kiva Arrow's tip opens a'la Kiva's Hell's Gate and Decade fires a red energy arrow with the power of the Darkness Moon Break.
Ryuki Dragredder: Decade Dragoon*
Decade, with Ryuki Dragredder's assistance, performs Ryuki's Dragon Rider Kick.
Blade Blade: Decade Edge*
The Blade Blade charges with lightning and Decade releases a Sword Beam like Blade King Form's Royal Straight Flush.
Faiz Blaster: Decade Photon*
Decade traps the enemy with an energy drill like Faiz's Crimson Smash, then fires a giant beam from the Faiz Blaster.
Agito Tornador: Decade Tornado*
Agito Tornador grows an energy ram resembling Agito's Cross Horn emblem and charges through the enemy.
Momotaros: Decade Liner*
Momotaros performs a version of the Extreme Slash; the one time it's used, the DenGasher's blade sticks into Kuuga Gouram's "butt" and Momo uses it as a giant bludgeon.
*
The arcade game Ganbaride gives Decade his own version of this, in which four-color doppelgangers of Decade ride energy rails and attack the enemy in a fashion reminiscent of Den-O Liner Form's four different Train Slash attacks before the real Decade finishes them off with his version of the Fullthrottle Break.
Zecter Kabuto: Decade Meteor*
Zecter Kabuto rams the enemy high into the sky, the lands and transforms back into Kabuto; he and Decade then perform their respective Rider Kicks while in Clock Up.
Hibiki Ongekiko: Decade Wave*
Hibiki Akanetaka rams the enemy before turning into a giant Taiko; Decade then uses it to perform a version of Hibiki's finishers.
Double CycloneCyclone and JokerJoker: Triple Extreme*
The three Riders perform their own version of Double's Joker Extreme.
Heel Face Turn: Former head of Dai-Shocker, turned amnesiac hero...turned head of Dai-Shocker again...turned hero for real. It's obviously going to happen again in Superhero Wars, given the pictures of the Riders and Rangers working together, we just don't know how yet.
Super Mode: Complete Form, which lets him summon the super modes of his predecessors and copy their finishing moves. When the nine AR Riders are actually present, it sends all of them straight into their most powerful forms so they can finish off Doras together.
Multiversal Conqueror: As Great Leader of Dai Shocker, pre-amnesia and during part of the All Riders vs. Dai Shocker film.
Planar Champion: The role he takes as Decade. Then he finds out that it was the wrong idea. Superhero Wars offers a twisted version, where he re-forms Daishocker in order to protect the Kamen Rider universe from Captain Marvelous and Daizangyack.
Power Copying: His entire theme, being able to transform into any of the nine previous Heisei Rider heroes.
Suicide By Cop: In Movie Wars, he allows Natsumi to kill him after he defeated all the other Riders, as his actions meant that the Kamen Rider multiverse would exist forever.
Super Speed: The Kabuto: Clock Up and Blade: Mach Attack Ride cards. Also, Faiz Axel by default.
Transforming Mecha: The Faiz: Autovajin and Kaixa: Side Basshar Attack Ride cards.
Undead Tax Exemption: Every time he enters a parallel world, he's assigned a role that helps him solve the current crisis, such as being a policeman in Kuuga's World or a lawyer in Ryuki's. Given a tragic twist in Movie Wars, where Wataru Kurenai says that since Decade's job is to be whatever the multiverse needs, he has no "real" role and therefore no home, meaning that there's supposedly no way to bring him back when he dies.
Dual Wielding: The Hibiki: Ongekibou Rekka Attack Ride card.
Kill It with Fire: The Ryuki: Strike Vent and Hibiki: Onibi Attack Ride cards.
Shapeshifter Weapon: When using the Final Form Ride cards, Decade can transform a Rider into either a weapon, vehicle or sentient creature for him to use:
In spite of her terrifying dream, Natsumi refuses to believe Narutaki's ranting about Decade being a "destroyer of worlds". No-one she can keep in line with her family's pressure point technique could end up becoming a murderer of Riders...right?
Finger Poke of Doom: The Hikari Secret Laughing Pressure Point, which she mostly uses on Tsukasa when he does or says something rude. Weaponised during the big movie war fight.
Taking the Bullet: Steps in the way of Apollo Geist's life-draining beam for Tsukasa...a matter of minutes after he insisted that they weren't comrades.
An Alternate Universe incarnation of the 1st Heisei era Kamen Rider, established in 2000. He tends not to get involved in fight scenes as much as Tsukasa and Kaitou, but is easily the friendliest and most approachable member of the team (to the point that Tsukasa snarks it's the only thing he's good for).
Multiform Balance: Possesses Mighty, Dragon, Pegasus, Titan, and Growing forms just like the original. He never achieves Rising or Amazing Mighty, but has one form Godai never did: (Rising Ultimate).
Mythology Gag: In All Riders vs. Daishocker, he gives his predecessor's trademark thumbs-up to Tsukasa before his match with Amazon.
Retroactive Recognition: Ryota Murai showed up in the Den-O/Kiva crossover movie Climax Deka as Kazuya Suzuki, the detective assigned to work with the DenLiner crew.
Natsumi's Grandfather, who owns and runs the dimension-hopping photo studio. He's harmless enough, but it's unclear just how aware he is of the dimension-hopping superhero adventures going on around him, especially after we learn that he's Doctor Shinigami...sort of.
Cool Old Guy: Though he's not as active as others, he's the unflappable foundation of the Hikari Studio. He's also an excellent cook, preparing all sorts of fun treats, particularly cookies that look like the group during the Shinkenger arc.
Disney Death: He shows up after the fight with Dai-Shocker, apparently back to his old self with no memory of what happened.
Heel Face Turn: Movie Wars suggests he was brainwashed into being Shinigami in the first place, and he clearly no longer wants any part of it. He's drafted into Super-Shocker by his own cape, and we see a Shinigami Gaia Memory being destroyed when Natsumi rescues him.
Parental Substitute: Natsumi's flashbacks show that she's been living with Eijiro since she was a child.
Weirdness Censor: Absolutely nothing fazes this man. His reaction to the Spider Fangire and Sieg coming into the studio? Take their pictures; after all, they're customers.
Kivala
A mini-Kivat from the World of Kiva. She appears to be working with Narutaki at first, but gradually drifts towards the good guys and transforms Natsumi into a Kamen Rider during the final movie.
Alternate Reality: Obviously, but in the S.I.C. Hero Saga story for Kiva, she shows up during Nago and Megumi's wedding to warn them about the Lion Fangire's spirit becoming a giant Sabbat and lets Megumi transform into Kamen Rider Kivala.
An alternate universe of the 9th Heisei era Kamen Rider, established in 2008.
Wataru
An alternate version of Kamen Rider Kiva. Wataru is a twelve-year old boy who reluctantly oversees the truce between humans and Fangires. After the attack of the Beetle Fangire, Wataru learns to be confident of his powers and its responsibility.
Heroic Sacrifice: Non-lethal version: He managed to defeat the alternate Kamen Rider Odin and gain the Time Vent card, only for him to be too weak to use it.
Meaningful Name: Haguro means "black wings", referencing his Contract Monster Darkwing.
Not What It Looks Like: It looks to all the world that he's the one who killed Reiko, but he's actually trying to get Odin's Time Vent so he can prevent the murder to begin with.
An alternate universe of the 5th Heisei era Kamen Rider, established in 2004.
Kazuma Kendate
An alternate version of Kamen Rider Blade. Kazuma is a Rank Ace employee of the BOARD corporation and kind of a smug jerk. However, he gets demoted in the course of Decade's passing through his world, but later regains his confidence and learns what it truly means to be a Rider.
Ascended Meme: This is a reference to the "Ondul" meme associated with original Blade star Takayuki Tsubaki and his occasionally slurred-by-emotion pronunciations.
What Happened to the Mouse?: When Garren shows up in the final arc, Kazuma only ever calls him by his Rider name, leaving it vague as to whether Sakuya survived Hajime's life-draining machine or if he died and this is a second Garren.
Mutsuki Kuroba
An alternate version of Kamen Rider Leangle. Mutsuki is a Rank King employee of the BOARD corporation.
Jerkass Façade: Pretends to be a jerk to Kazuma in order to teach him some humility.
Meaningful Name: Kuroba sounds very similar to the English word "clover".
What Happened to the Mouse?: When Leangle shows up in the final arc, Kazuma only ever calls him by his Rider name, leaving it vague as to whether Mutsuki survived Hajime's life-draining machine or if he died and this is a second Garren.
Hajime Shijo
An alternate version of Kamen Rider Chalice. Hajime is the president of the BOARD corporation.
All Your Powers Combined: Absorbs Garren's and Leangle's life force in order to create the Black Joker.
An alternate universe of the 2nd Heisei era Kamen Rider, established in 2001.
Shouichi Ashikawa
An alternate version of Kamen Rider Agito.
Composite Character: He began as the user of the G3-X suit, until his transformations into Exceed Gills led to him abandoning the G3 team. Later his transformation stabilizes and he becomes Agito. Thus he is all three Agito Riders, though not simultaneously.
It's Not You, It's My Enemies: He ran away from the police because his evolution into Exceed Gills was attracting the Lords' attention and he didn't want Yashiro getting hurt.
Meaningful Name: He has the given name of the original Agito (Shouichi Tsugami), and his family name is a mix of that of Gills' and G3's (Ryou Ashihara and Makoto Hikawa).
The world of the 8th Heisei era Kamen Rider, established in 2007. Unlike other universes, this seems to be the original Den-O universe, so information about the characters can be found on that show's Character page.
Hibiki's apprentice who eventually takes up his master's mantle as Kamen Rider Hibiki. Helps his friends Akira/Amaki and Todoroki reunite the three schools of Oni.
Ship Tease: Implied to have a thing for Akira/Amaki.
Other characters
Narutaki/Colonel Zol
A guy in a hat and coat who follows the group around, pitting enemies against them and ranting about how everything is Decade's fault. That's about it.
Cassandra Truth: He travels the multiverse warning people that Decade is going to destroy them all. Since Tsukasa is trying to help people, it looks like it's just bluster. Subverted two ways: Tsukasa is going to destroy the multiverse, but that's actually a good thing. Also, Narutaki is Colonel Zol of Super Shocker, suggesting that he told a Jedi Truth to get Decade killed so they could take over.
Enemy Summoner: He's no threat to any of the main characters physically, so he either summons Riders / monsters to fight for him or convinces people that Decade's a threat.
The second original Rider for the series, a dimension-hopping thief who looks out for no-one but himself (at first, anyway). He comes from a world ruled by monsters who brainwashed the population, including his own brother.
Even Evil Has Standards: Detests those who take the freedom of others, and is willing to bail out Tsukasa and co. if he feels he owes them.
Evil Cannot Comprehend Good: At first. He assumes that the "greater treasure" Tsukasa was talking about in Faiz's world was a better Rider belt, and doesn't get why Tsukasa is so bent on getting Geist's Perfecter and saving "Natsumelon".
Irony: He loves poking at Tsukasa's distaste for sea cucumber, but the live shows have a Running Gag where eating sea cucumber causes Diend to flip out and start shooting up the place.
Mythology Gag: The treasures he stole from the various worlds were originally items exclusive to that series' movie (the Orga Gear, the G4 microchip, et cetera). This makes a kind of psuedo-sense when you consider that Kaito himself is from a world based on a movie continuity, Kamen Rider Blade's Missing Ace movie. This gets dropped quite quickly, but his obsession with movie continuities comes back with his Complete Form, which features movie-exclusive Riders.
Super Mode: Diend gets his very own Complete Form during the events of Cho Den-O Trilogy: Episode Yellow. As a movie-exclusive form, it summons an entire team of movie-exclusive Riders and lets him use all their finishers at once.
Super Speed: When using the Tesla Bands on his wrists.
An enigmatic man with the power of Kamen Rider Abyss, with Abysshammer and Abysslasher as his Contract Monsters. Revealed to be who killed the alternate version of Reiko Momoi, and thus the Big Bad of Ryuki World. However, after Decade and Ryuki defeat him, he is revealed to be the previously unseen Paradoxa Undead.
Alien Blood: The first hint he isn't all he seems.
Big Bad: Of Ryuki World but also has a large role in Blade World.
A representative of Dai Shocker, who extends his own dwindling lifespan by stealing the life-force of others. After Dai Shocker is crushed in All Riders, he marries the Fangire Queen to increase his powers and starts accelerating the collision of worlds. Thanks to Tsukasa and Kaitou, he doesn't last long enough to be part of Super Shocker.
Original Generation: While Apollo Geist is an established character, in Decadehe gains power from the Fangire and becomes Super Apollo Geist in the final arc.
