Wataru Kurenai/Kamen Rider Kiva
- Live actor: Koji SetoSuit actor: Seiji Takaiwa
A shy violinist who fights Fangires as Kamen Rider Kiva.
- Betty and Veronica: The Betty to Taiga's Veronica for Mio's Archie.
- Cultured Badass: He'll kick your ass, then go back to playing his violin.
- Experienced Protagonist: Has been operating as Kiva for an unknown amount of time before his series even begun. In fact, he already has access to all of his base forms by the time he first transforms in his series.
- Extreme Doormat: Wataru's often subscribed to magazines he doesn't want and buys things that he doesn't need because he doesn't like refusing others. Of course, Character Development has helped him for the better.
- The Dreaded: Nago, Shima and Megumi speak of Kiva as a terrifying, mysterious spectre who preys on humanity, when he is in fact a meek shut-in whose hobbies include taking baths and collecting bizarre smelly items for the purpose of making violins. It helps that Wataru basically never speaks as Kiva, leading to his reputation as a silent killer as opposed to The Quiet One.
- Furo Scene: Wataru has a scene in a bath basically Once an Episode.
- Half-Human Hybrid: Dhampyr-like; Wataru himself didn't know until #36. Though it should be noted that unlike most Dhampyrs in fiction, his mother is the vampire parent.
- The Hero: The identity of Kamen Rider Kiva, who reluctantly battles Fangires.
- Heroic BSoD: Suffers this twice, first when Bishop, in an effort to bring out his full Fangire powers, makes him go berserk and attack his friends; he's badly traumatized and reverts to his old Hikkikomori state. It happens again when Mio dies, to the point where he tries to change the past and keep his parents from meeting so he won't ever be born.
- Hikikomori: Bat pun aside, this is Wataru at the beginning of the series. He improves, then regresses after the death of a loved one, only to come back stronger.
- Her Heart Will Go On: Mio encourages Wataru to live on after her death, and, as indicated by the epilogue, in the future, Wataru has a son with an unknown woman.
- Hunter of His Own Kind: A half-Fangire, half-human who fights full-blooded Fangires.
- Hybrid Power: His Fangire side allows him to become Kiva and his human side prevents him from feeling the urge to drain human life energy. However, the fact that he is only half-Fangire also prevents him from being able to utilize the full power of Kiva. This is illustrated by the chains binding his Rider form. Furthermore, his human blood keeps his Fangire side in line; if let loose, Wataru becomes more or less an animal as shown in #39 and #40.
- O.O.C. Is Serious Business: From the early start of the series, Wataru was very withdrawn and didn't want to get into battles, prefering to find peaceful solutions. However, when he discovers his new friend Kengo is being tricked by a Rhinoceros Fangire, who fools young people with dreams by acting as their manager then drain their life force and keep their treasured belongings as souvenirs, Wataru doesn't hesitate to fight back. He even declares that he would not forgive him.
- Shrinking Violet: He eventually grows out of it.
- Talking with Signs: Wataru initially communicates with a notebook full of pre-written responses. At one point Megumi asks something like "You can't have a response for everything in there!" When Wataru starts actually looking for a response, she takes it away from him.
- The Ghost: Much like his half-brother, his Fangire form - assuming he has one - is never shown in-series, but unlike his brother (who's heavily implied to be the Snake Fangire), there isn't even a hint as to what Fangire he is. The novelization of the series subverts this, since Kiva is his fangire form.
- Took a Level in Badass: Besides the standard Next Tier Power-Up, he goes from a shut-in who thinks he's "allergic to the world" to a professional monster killer, and then takes it one step further by declaring himself the new Fangire King near the end.
- Vampire Hunter: Basically what Kiva does as a Kamen Rider.
Tropes exclusive to him as Kamen Rider Kiva
- All Your Powers Combined: DoGaBaKi Form. The Hyper Battle DVD takes this Up to Eleven with DoGaBaKi Emperor Form.
- Dark Is Not Evil: Kiva's powers are vampire-based, yet Wataru is decidedly one of the good guys.
- Finishing Move:
- Kiva Form: (Rider Kick) Darkness Moon Break
- Garulu Form: (Rider Slash) Garulu Howling Slash
- Basshaa Form: (Rider Shooting) Basshaa Aqua Tornado
- Dogga Form: (Rider Thrust) Dogga Thunder Slap
- DoGaBaKi Form: (Rider Kick) A stronger version of the Darkness Moon Break.
- Emperor Form:
- (Rider Kick) Emperor Moon Break
- (Rider Slash) Emperor Howling Slash
- (Rider Shooting) Emperor Aqua Tornado (While never shown in series, it was shown in Kamen Rider: Battride War)
- (Rider Thrust) Emperor Thunder Slap
- (Rider Slash) Final Zanvat Slash
- Flight Style: Bloody Strike
- DoGaBaKi Emperor Form: (Rider Kick) DoGaBaKi Emperor Break
- Giant Flyer: As Flight Style.
- Multiform Balance:
- Jack-of-All-Stats: Kiva Form, the default balanced form.
- Fragile Speedster: Garulu Form, which has the fastest land speed and a stronger kick in exchange for lower arm strength and durability.
- Squishy Wizard: Basshaa Form, which hits hard with his gun but isn't that durable.
- Mighty Glacier: Dogga, the physically strongest but slowest form.
- Super Mode: Three of them.
- DoGaBaKi, which has higher kick power than the earlier forms but is otherwise slower and has weaker arm strength.
- Emperor Form, which is superior to the basic forms in every way except speed (Garulu beats it there) and grants him access to all three extant weapons, plus a new one. It also lets him turn into Flight Style, a dragon-like bat monster.
- DoGaBaKi Emperor, only appearing in a DVD special, which is essentially DoGaBaKi Form with Emperor Form's combat abilities.
- Hour of Power: Dogabaki Form, which can only be used for five minutes before its power becomes lethal to him (hence why he only uses it once in the series, plus the non-canon Hyper Battle DVD special).
- Making a Splash: Basshaa Form, which is based on a fish-like humanoid and can use water to attack.
- Make Me Wanna Shout: The Garulu Saber includes an acoustic gun in its jaws, letting Kiva use the Howling Shock attack and literally blow away enemies from the soundwave's sheer pressure.
- Mid-Season Upgrade: DoGaBaKi Form. Which gets used all of once due to its limits and Kiva getting Emperor Form just a few episodes later.
- One-Winged Angel: His Flight Style, which is basically him turning into a freaking dragon.
- Playing with Fire: The Garulu Saber uses fire in Emperor Form, which can either act like a rocket to send him into the sky, or a double-bladed sword with fire on both ends.
- Power Limiter:
- Emperor Form is actually Kiva's true form, his default form is actually a limiter because his Half-Human Hybrid nature meant his true power would've overwhelmed him originally, thus the chains on it that break off during transformation.
- The Arms Monsters create one for the Zanvat Sword so its unstable powers won't trigger Wataru's Fangire blood and turn him into a berserker.
- Shock and Awe: Dogga Form, which (being based on Frankenstein's monster) uses electrical power.
- The Southpaw: In Garulu Form, with his left arm being transformed by its power.
- Weapon of Choice: Garulu Saber in Garulu Form, Basshaa Magnum in Basshaa Form, and Dogga Hammer in Dogga Form. He can use all three in DoGaBaKi Form and Emperor Form, and later obtains the Zanvat Sword.
Kivat-bat the 3rd
- Voice actor: Tomokazu Sugita
Wataru's partner, of the Kivat race.
- Deadpan Snarker: Kivat is one snarky fellow.
- Magic Music: Uses "fuestles" to summon Wataru's form-change weapons.
- Transformation Trinket: His race is built for it, after all.
- Vague Age: It's never stated how old he is - since it's never revealed if he was born before or after Watarunote , he could just as easily be Wataru's Older Sidekick, the same age as Wataru, or younger.
- Live actor: Nana Yanagisawa
- Big Eater: Even if she's a model...
- Faux Action Girl: Usually gets one-upped by Fangires to become the Distressed Damsel for Kiva or Ixa to save. She does have a moment where she Took a Level in Badass and upgrades to an Action Girl after the Rook arc.
- Informed Attractiveness: Megumi's a model and has been stalked by not one, but two Fangires, both of whom find her attractive, but she's just as good-looking as the rest of the cast on the show.
- Official Couple: With Nago.
- Trademark Favorite Food: She loves fish. She even first meets Wataru when the latter tries to take a fish bone from her plate.
- Why Did It Have to Be Snakes?: Like Yuri, she doesn't seem to like dogs very much.
- Live actor: Rina Koike
- The Atoner: When Shizuka feels bad about causing a rift between Wataru and Mio, she tries her best to get them to make up.
- Clingy Jealous Girl: Shizuka turns into a Green-Eyed Monster around Wataru and Mio.
- Hidden Depths: She might not look like it, but she's good at drumming.
- Locked Out of the Loop: Only learns that Wataru is Kiva in the final episode, though she does know about Kivat, and even Tatsulot after he joins up.
- Parental Substitute: Shizuka considers herself to be Wataru's "mommy."
- Live actor: Keisuke Kato
The main user of the IXA system in 2008.
- Berserk Button: Anything involving the denial of the buttons, and he doesn't really like music.
- Catchphrase: "Fangire, return that life to God!"
- Expy: Arguably a less hateful (and infinitely less jealous) version of Masato Kusaka.
- Good Is Not Nice: He's one of the good guys, but has a very rude personality early on.
- Nago being at his worst is how he killed his own father. He was a police chief who committed procedural errors that got a criminal acquitted, errors that Nago himself exposed to the media with no pity, no less, and drove him to commit suicide out of shame.
- Heroic BSoD: When Kiva beats him the first time. It takes a Fangire regarding him as Not Worth Killing to send him over the edge.
- Jerkass: Oh boy, is he ever! It takes Nago finding out Wataru is Kiva to become more of a Jerk with a Heart of Gold.
- Jerk with a Heart of Gold: After finding out that Kiva and Wataru are the same person, Nago comes off as more reasonable than he initially was, assuming that Wataru doesn't misuse his power.
- Official Couple: With Megumi.
- The Rival: To Kiva, at first. It gets a bit annoying when he's rather friendly to Wataru but initially antagonistic to Kiva.
- Serious Business: To the extent that he'll memorize everyone's orders during the group date in #21, just because.
- The Stoic: Becoming The Comically Serious on occasion.
- Vampire Hunter: An elite Fangire Hunter, as well as a bounty hunter.
- Live actor: Kouhei Kumai
- Career-Ending Injury: When Kengo temporarily joins the Blue Sky Organization, a Fangire injures his arm severely to the point where he can no longer play the guitar and has to end his dreams of being a rock star.
- Important Haircut: When Kengo comes back to the show as a Jerkass.
- Jumped at the Call: Kengo gets the opportunity to join the Blue Sky Organization when Megumi is arrested.
- The Rock Star: He wants to be one of these.
- Shipper on Deck: He's the first to notice Megumi and Nago's "amazing coordination" and "spirit of rock" in #19.
- Took a Level in Jerkass: Following his Fangire encounter, which robbed him of his rock star dreams. He eventually gets better, though.
Mio Suzuki/Pearlshell Fangire II
- Live actor: Yuria Haga
- Apologises a Lot: A given, considering her clumsy and shy nature.
- Betty and Veronica: The Archie for Wataru's Betty and Taiga's Veronica.
- Beware the Nice Ones: Despite being just as shy and awkward as Wataru, Mio is still someone you don't want to mess with, especially since she's the Queen of Checkmate Four. A prime example is her obliteration of the Spider Fangire.
- Cute Clumsy Girl: While working as a waitress, she managed to trip over herself, spilling food all over the customers.
- Extreme Doormat: Tends to have trouble asserting herself. Something she has in common with Wataru.
- Voice actor: Akira Ishida
Taiga Nobori/Kamen Rider Saga/ Kamen Rider Dark Kiva III
- Live actor: Shouma YamamotoSuit actor: Eitoku
- Barrier Warrior: Pulls this on the '86 King as an infant.
- Betty and Veronica: The Veronica to Wataru's Betty for Mio's Archie.
- Black Speech: His partner, Sagarc, is only able to speak a long forgotten Fangire language, with the exception of the words "Henshin" and "Wake Up".
- The Evil Prince: At first, it seems like this trope is played straight - he's the son of the previous Fangire King and the first Fangire Queen, he's in line for the throne, and he's set up as a villain. However, the "evil" part is first downplayed (he's more of an anti-villain than an outright Big Bad), and eventually it's outright subverted, since he decides to work towards co-existence between humans and Fangires near the end of the series.
- Finishing Move: Snaking Death Break.
- HeelFace Turn: Eventually decides that Fangires and Humanity can co-exist, and teams up with Wataru.
- Long-Lost Relative: To Wataru - they were friends as children but had no idea they were half-brothers.
- Patricide: Teams up with Wataru to kill his father, King/The Bat Fangire. Unlike most examples, there is no My God, What Have I Done?, mainly because King is a total bastard.
- Royal Rapier: Jacorder.
- Self-Made Orphan: At first, it seems like he's played this trope straight, seemingly having killed both his mother and his father. Subverted when it turns out that he didn't kill his mother.
- Snakes Are Sinister: His Fangire powers are snake-related, and we only see him using them a few times before he joins Wataru's side, and Sagarc is also snakenote -themed. We never learn how strong they are in comparison to the powers of Saga or Dark Kiva, since he never uses his Fangire Form once throughout the show.
- The Ghost: Not him, but rather, his Fangire form - it's clearly established that he is a full-blooded one, but he never transforms into one. However, throughout the show, it's heavily implied that he's the Snake fangire. Whether he simply prefers using the powers of Saga (and later, Dark Kiva), or said powers are stronger than his Fangire form, however, is never revealed.
- Transformation Trinket: Sagarc.
- Live actor: Kouhei Takeda
Wataru's father, a master violinist (and a thief) who disappeared under mysterious circumstances. He is the main Kamen Rider IXA in 1986. Eventually becomes the only human to become Dark Kiva, a feat he pulls off thrice before the resulting strain eventually killed him.
- Back from the Dead: In Episodes 19 and 20, though he does it by taking over Wataru's body.
- Betty and Veronica: Originally the Betty to Jiro's Veronica for Yuri's Archie, then becomes the Archie for Yuri's Betty and Maya's Veronica.
- Beware the Silly Ones: He's constantly seen as a lecherous person, with him being IXA seemingly the most serious he's willing to get. He also ends up becoming the second person to become Dark Kiva, and the only human in the show to do so.
- Bunny-Ears Lawyer: Say what you will about how he spends his time, but Otoya's mastery over the violin cannot be denied.
- Chivalrous Pervert: A good amount of time he spends is attempting to impress women. However, as Jiro learned, if you threaten one he has affections for, you'd better hope that he doesn't have the IXA system nearby.
- Determinator: While transforming into Dark Kiva kills humans, Otoya manages to transform thrice and survive, if only barely.
- Deuteragonist: A rare case in Heisei Kamen Rider, where the deuteragonist is not the main secondary Rider.
- Expy: To Gai Yuki (Black Condor) from Choujin Sentai Jetman. Both of them are womanizers in their own right. Difference is, Otoya's no loner.
- Foil: An indirect one to his son Wataru. Otoya's a confident, suave violinist who's very good at stealing; while Wataru's an extreme Shrinking Violet who struggles with even basic social standards.
- Friend to All Living Things: The puppy at Mal d'Amour takes a liking to him immediately, just like he would to Wataru 22 years later. Even flowers react well to Otoya's music...while Yuri just kills a whole pool of fish with hers.
- Impossible Thief: One of his more underrated and overlooked skills. Not just stealing things, but even planting and replacing things.
- Interspecies Romance: With Fangire Queen Maya.
- Live actor: Yu Takahashi
Megumi and Mitsuhide's mother.
- Betty and Veronica: Originally the Archie for Otoya's Betty and Jiro's Veronica, then becomes the Betty to Maya's Veronica for Otoya's Archie.
- Faux Action Girl: Gets hit by the Distress Ball to become the designated Distressed Damsel quite often.
- Posthumous Character: By 2008. Exactly how is unrevealed, but her spirit appears in the finale to congratulate Megumi on her wedding.
- Tsundere: Big time.
- Why Did It Have to Be Snakes?: She doesn't like... puppies.
- You Killed My Father: Yuri is dead-set on getting Revenge on Rook because her mother became a victim to one of his murderous Time Plays.
Kivat-bat the 2nd
- Voice actor: Tomokazu Sugita
- Even Evil Has Standards: He switches sides from King to Otoya mid-fight over the way King treated Maya (rather than his ideology in general).
- HeelFace Turn: Granted, he was a Punch-Clock Villain at worst, but as mentioned above, due to King horribly treating Maya, he decided that King had gone too far and granted Otoya his power. He later joins Taiga, who's not really evil either.
- Magic Music: Where do you think Kivat the 3rd got his power form?
- Transformation Trinket: Much like his son and grandson.
- Everyone Calls Him "Barkeep": 'Master', actually.
- Locked Out of the Loop: He's not aware about Fangires or that his regular costumer is Werewolf.
- Strange Minds Think Alike: Shares Shima's fitness obsession and Jiro's love of Onyanko Club.
- Color-Coded for Your Convenience: Jiro (Blue), Ramon (Green), Riki (Purple)
- Desperately Looking for a Purpose in Life: As mentioned before, they're all orphans with no higher purpose than revenge. If not for Otoya, they may have become a threat equal to the Fangire.
- Expy: They share more than a few traits with Ryotaros additional Imagin partners. Gets something of a lampshade in [[The Movie Onigashima Battleship]), where they make a gratuitous cameo.
- I Owe You My Life: The main reason they help Wataru - they owe Otoya, since he allowed them to escape imprisonment.
- Last of Their Kind: Due to fangire hunting efforts, the three are the only remaining members of their respective species.
The last surviving member of the Wolfen Race. Chronologically also the first user of the IXA system.
- Absurdly Sharp Blade: His claws are able to cleave the soul from the body.
- Betty and Veronica: The Veronica to Otoya's Betty for Yuri's Archie.
- Character Tic: When transforming, he tends to kneel down and draw a line on the ground with a finger. If he's wearing Cool Shades, he'll throw them down too.
- Cool Shades: The only part of his wardrobe that isn't magic.
- If I Can't Have You...: Pulls this when Yuri leaves him for Otoya.
The last surviving member of the Merman Race.
- Character Tic: When he transforms, he spins around and does a cheerful pose.
- Enfante Terrible: He is the most vicious of the Arms Monsters, despite looking like a young boy.
- Making a Splash: Attacks by spitting high-pressure balls of water.
- Our Mermaids Are Different: His Merman form looks more like a sea monster than the usual human/fish hybrid.
- Older Than They Look: Applies to them all, but Ramon stands out for looking about 14. Also lampshaded: when he tells Yuri he's really 105 years old, she doesn't believe him.
The last surviving member of the Franken Race.
- Battle Butler: He has the suit for it, but in action he's more of The Brute.
- Character Tic: When he transforms, he bashes his fists together.
Checkmate FourThe most powerful members of the Fangire Race.
The lord of Fangires.
- Big Bad: Of the 1986 portion of the show.
- Came Back Wrong: In the finale, he's revived as essentially a mindless zombie version of himself.
- Final Boss: Twice - first Otoya and Wataru team up to defeat him in the past, then Taiga and Wataru team up to take him down in the present.
- Karmic Death: When his attempt to kill Maya was turned against him thanks to infant Taiga.
- Predecessor Villain: He's killed off in 1986, leaving the rest of the Checkmate Four to drive the plot.
Maya/Queen/Pearlshell Fangire I
- Betty and Veronica: The Veronica to Yuri's Betty for Otoya's Archie.
- Daddy Had a Good Reason for Abandoning You: It's not like she wanted to leave Wataru, but her status as a fugitive due to defecting from the King would make it difficult to raise Wataru, and thus left him so he'd be free of the danger.
- High-HeelFace Turn: Although she wasn't very evil to begin with.
- Really 700 Years Old: Claims to have known Vivaldi himself.
- The Smurfette Principle: Of the Checkmate Four, she's the only female member. Unless you count her successor as a member at the same time.
- Dramatic Irony: The first time we see him, he's living peacefully with amnesia in the present, with good things happening to him, all while events of the past reveal his true nature. And his normal behavior seems to hint at having already taken head injury between '86 and the mass monster killings period.
- Made of Iron: He survives all of his self-inflicted punishment - though one Game-Breaking Injury in the past not only caused his amnesia in '08, but comes back to bite him fatally. Made Of Irony?
- Panthera Awesome: His Fangire form is a humanoid lion.
- Psychopathic Manchild: Routinely makes up "games" for himself, basically boiling down to "kill a set amount of people sharing a common trait within 12 hours", with absolutely no other concerns than said game. Note also that he is pretty childish while he has amnesia.
- Nice Job Fixing It, Villain!: If he had just kept his mouth shut, or better yet, encouraged Taiga to kill Wataru, as opposed to doing what he actually did - reveal he was the one who killed Mio - he wouldn't have had Taiga turn on him.
1986 users: Jiro, Otoya, Yuri (#31)
2008 users: Nago, Kengo, Megumi (#31)
- Finishing Move:
- Save Mode: Broken Fang
- Burst Mode: Ixa Judgement
- Rising IXA: Final Rising Blast
- Flawed Prototype: '86 IXA, which turns into a rare all-season-long Chekhov's Gun when the flaw is exploited to defeat Rook.
- Handguns: Ixariser, leading to Guns Akimbo when used with IxaCalibur.
- Heads-Up Display: Revealed in Decade, Ixa has yellow HUD with "RETURN IT TO THE LIFE AND THE GOD" displayed on top.
- Jack-of-All-Stats: Burst Mode.
- Light Is Not Good: IXA's stark white appearance does nothing for the fact that we learn early on that Nago is not quite on the level. Heck, Jiro's technically one of the monsters, and Kengo Took a Level in Jerkass before he takes it over. Not to mention that a couple of Fangire get to jack it.
- Power Fist: Ixa Knuckle.
- The Power of the Sun: Whenever Ixa changes from Save to Burst Mode, it releases a burst of heat.
- Stone Wall: Save Mode (1986 IXA's only mode).
- Super Mode: Rising IXA.
- Swiss Army Weapon: Ixa Calibur, which doubles as a blaster and a Cool Sword.
1986 users: King, Otoya
2008 users: Taiga
Movie Exclusive Characters
A race of monsters sealed up by a Kiva from long ago before being released in modern times.
Takashi Sugimura/Kamen Rider Arc
A prison convict who awakened Arc's spirit.
- Big Bad: Of The Movie.
- Bring My Brown Pants: Wets himself out of fear from seeing the Legendorgas for the first time.
- Demonic Possession: Is possessed by Arc after accidentally awakening him.
- From Nobody to Nightmare: Went from being a normal prisoner to ruler of the Legendorgas.
- Older Than They Look: Having Arc's spirit inside him prevented him from looking any different between 1986 and 2008.
- One-Winged Angel: Does this by absorbing the eye on the moon, transforming him into a fiery, winged demon.
- Our Giants Are Different: As Arc, he's massive, over three meters tall. Fitting, given legendary creatures are his race's theme.
- Sealed Evil in a Can: Arc was sealed inside some ruins in Sugimura's prison before he found it and awakened him.
Takato Shiramine/ Kamen Rider Rey
An agent working for the World Wide Wing Association.
- Transformation Trinket: For Kamen Rider Rey.