!!Goro Kisaragi
->Live Actor: Nobuo Yana
Gentaro's grandfather who owns "Kisaragi Motors", a motorcycle repair shop. [[spoiler:He raised Gentaro after a traffic accident killed his parents during when he was only in third grade.]]

* BadassBiker: Seemed to be one in the past.
* CoolOldGuy
* ItRunsInTheFamily: Seems like Gentaro's not the only one who is a LargeHam. [[LampshadeHanging Lampshaded]] by Tomoko who notes that he's "Gentaro's grandfather, all right."

!!Rokuro Utahoshi
->[[spoiler:Live Actor: Toru Kazama]]
Kengo's father who spent his last days trapped in the Moon following the theft of the Astro Switches.

* DisappearedDad
* DyingAlone: It is outright stated that he spent his last days alone in the Rabbit Hatch.
* {{Expy}}: Of [[Series/KamenRiderSuper1 Professor Henry]], both were responsible for creating space-themed Riders.
* FamousLastWords: or, at least, when we last saw him, before he was engulfed by the moon base's explosion...
* HeWhoMustNotBeSeen: Aside from being in a spacewalk suit, nothing is ever shown of his actual appearance.
** Episode 33 shows him in a photo [[spoiler: wearing a ''similar'' suit that Tachibana is currently sporting.]]
* TechnoWizard: He was the one who made the Fourze Driver, its Switches and the Power Dizer.
* [[spoiler: TrulySingleParent]]

!! Yuki's Parents
->Live Actors: Yuu Kamio and Mari Takahashi.

Two of the extras within the series and is an eccentric duo.
* ChewingTheScenery: Yuki's dad, full stop when he is cooking something.
* [[CosplayOtakuGirl Cosplay Otaku Parents]]: Of course! Just look at them with their outfits in Eps 43 and 44.
** And they do this for ''every'' meal they do, whether it be from India or China.
* FunPersonified
* LargeHam: YES!
** ItRunsInTheFamily: No wonder Yuki is so [[LargeHam hammy]]; they're also hams!
* NiceHat: BOTH OF THEM!
* WomanInWhite: Yuki's mom.

!!''Movie Wars [=MegaMax=]''

!!Nadeshiko Misaki/Kamen Rider Nadeshiko
->Live Actor: Erina Mano
->Suit Actor: Hitomi Sanae

A mysterious female transfer student who literally falls from the sky and into Gentaro's arms. For some unknown reason, she possesses a blue version of the Fourze Driver and can transform into Kamen Rider Nadeshiko.

[[spoiler:Her true identity is SOLU, a mysterious extraterrestrial substance. Finding itself intrigued by Gentaro, SOLU imitated the form of an unrelated female student in order to get close to him, copying the Fourze Driver as well. She is later kidnapped by Foundation X and turned into the SOLU Switch, which is used alongside the [[Series/KamenRiderOOO Poseidon Medals]] to transform Rem Kannagi into Super Galaxy King]].

!!! Tropes that apply to her in general
* [[spoiler:AscendToAHigherPlaneOfExistence: After being transformed into the SOLU switch by Kannagi, she becomes a being of pure energy and [[ButNowIMustGo departs back into outer space]]. She comes back in ''Movie War Ultimatum'' to help fight the Akumaizers.]]
* [[spoiler: BackFromTheDead: She comes back in Ultimatum.]]
* BadassAdorable: Kicks the asses of all those Dustards, but looks so damn ''cute'' doing so.
* BatmanCanBreatheInSpace: When Gentaro shows her the moon, the two try to kiss. [[spoiler: Then she gets the idea to remove her helmet, and that's when Gentaro gets the idea that something's wrong.]]
* [[spoiler:BigDamnHeroes: In ''Movie War Ultimatum'', she returns to Earth just in time to rescue Yuki from an exploding spaceship.]]
* TheCutie: Is she ever. Even the way she says "Uchu Kita!!!" radiates of cuteness!
* {{Foreshadowing}}: Her power to emulate Fourze's own powers could probably count for hinting [[spoiler:Fourze Rocket States]].
** Also, [[spoiler: her being created from space could also foreshadow Kengo himself, seeing as he was born from the Core Switch]].
* [[spoiler:FunWithAcronyms: SOLU is short for, '''S'''eeds '''O'''f '''L'''ife from the '''U'''niverse. SOLU also kinda sounds like "soul".]]
* [[spoiler:HumanAliens: Subverted. She looks human, but her true form is basically a blob of silver material.]]
* IdenticalStranger: [[spoiler: A justified case, as Nadeshiko copied a human girl. Understandably, when Gentaro meets said girl at the end, she doesn't recognize him.]]
* KickChick
* [[spoiler:KissingDiscretionShot: She gives a kiss to Gentaro at the end of the movie, but the camera was focused on them from the waist down, and only cuts to another scene a second later.]]
* NewTransferStudent: [[spoiler: Subverted.]]
* ProperTightsWithASkirt
* PunnyName: According to WordOfGod, she is named after Nadeshiko Japan, the national women's football team which had recently won the FIFA Women's World Cup at the time of the movie's release. However, the team name ''does'' refer to the flower from which the Yamato Nadeshiko takes its name.
* SatelliteLoveInterest: Justified, as there wouldn't be a lot personality in you if [[spoiler: you were a substance from space who transformed into a human girl. She's got a lot more personality in ''Movie War Ultimatum'', probably due to evolving even further]].
* ShoutOutThemeNaming: Shares a name with [[Series/KamenRiderStronger Yuriko Misaki]], although written differently in kanji.
* [[spoiler:TookALevelInBadass: In ''Ultimatum''. While she wasn't a push over before, she handles herself in combat ''very'' well this time, even untransformed.]]
* VerbalTic: Repeats the last words that someone says [[spoiler:until Gentaro admits his feelings for her. Dropped completely in ''Ultimatum'']].

!!! Tropes exclusive to her as Kamen Rider Nadeshiko
* AssKicksYou: One of the attacks on the Dustards. [[spoiler:Also uses it a lot in ''Ultimatum'']]
* CombinationAttack: Can do the ''Double Rider Rocket Punch'' with Gentaro/Fourze.
* FinishingMove:
** ''Nadeshiko Kick''
** ''Nadeshiko Rocket Kick''
** ''Nadeshiko Rocket Punch''
* KillerRabbit: In spite of her cutesy demeanor, she uses an almost disturbingly brutal fighting style, kicking people through walls, repeatedly punching them in the gut, and at one point ''[[NeckSnap she breaks a Dustard's neck]]''. The Director's Cut even shows her pulling elbow and knee strikes that are ''[[DoNotDoThisCoolThing not something you want your kids learning]].''
* MaleGaze: Her first fight as a Kamen Rider has Gentaro ''definitely'' getting a good view at her. Judging by the fact he wasn't even looking at the Dustards he was fighting at the time and copying her every costume stretching kick.

!!Legendary Seven Riders

The first seven Kamen Riders: [[Series/KamenRider Rider 1, Rider 2]], [[Series/KamenRiderV3 V3, Riderman]], [[Series/KamenRiderX X]], [[Series/KamenRiderAmazon Amazon]] and [[Series/KamenRiderStronger Stronger]]. They appear in ''Movie Wars Megamax'' to fight against Foundation X and to stop Rem Kannagi's plans.

* BackToBackBadasses: The Riders are paired together when dealing with Foundation X's forces all over the world: Riders 1 and 2, V3 and Riderman, and X and Amazon. [[TheAce Stronger]]...do you think he really even needed one?
* {{Cool Old Guy}}s: Each of them have to be older than '''fifty''' by now, but they're still just as capable of kicking ass as they were back in the day.
** Justified since the majority of them (minus Riderman) are reconstructed humans (cyborgs), and Amazon is powered from his magic armlets.
* TheMagnificentSevenSamurai
* SealedGoodInACan: All seven are trapped inside Core Medals and Astro Switches by Kannagi.
* [[FiveManBand Seven-Man Band]]:
** TheLeader: Ichigo
** TheLancer: Nigo
** {{The Big Guy}}s: V3, Amazon, and Stronger.
** TheSmartGuy: Riderman
** TheHeart: X

!!Lem Kannagi

A member of Foundation X, who seeks to possess the Core Medals from the future and the power of the mysterious SOLU. Eventually, he ends up becoming '''Super Galaxy King.''' He is involved in the creation of super lifeforms known as "Mutamids."

* {{BFS}}: His ''coat'' turns into one.
** ThrowingYourSwordAlwaysWorks[=/=]PrecisionGuidedBoomerang
* BigBad: Of the entire Movie War. Even though Poseidon wasn't related to him at all, he still benefited from his existence.
* TheDragon: Has two of them, one of which turns into a ''literal'' dragon.
* TheGlassesComeOff: He does this when revealing his treachery.
* AGodAmI: What would you expect from a guy who calls himself "''Super'' Galaxy King?"
* [[spoiler: HoistByHisOwnPetard: At the end of the movie, Nadeshiko helps Gentaro absorb his Cosmic Energy, which never would have happened if he hadn't done what he did below.]]
* KarmicDeath: [[spoiler:While he was probably mortally wounded by Fourze and OOO's FinishingMove, he's finished off when his own ship runs him down.]]
* [[spoiler: KickTheDog: His "murder" of Nadeshiko, turning her into an Astro Switch and using her as a part of his plans. He then proceeds to tell Gentaro that Nadeshiko wasn't just sealed in the Astro Switch but is pretty much ''dead''.]]
* JetPack: Has one as the Super Galaxy King, similar to Fourze.
* MakeMeWannaShout: He can do this as a human, probably due to his Mutamid research.
* ManInWhite: As with anyone from Foundation X.
* OneWingedAngel: Despite using a Driver like a Franchise/KamenRider, his transformation into Super Galaxy King is more like this.
* RasputinianDeath: [[spoiler:As if taking two SuperMode [[FinishingMove Rider Kicks]] wasn't enough, he's knocked in front of a ''space shuttle'' and run over by it...then it ''explodes!'']]
* ShoutOut: His "Super Galaxy King" is one to the villain of the ''Series/KamenRiderSkyrider'' movie. Which is odd, considering Skyrider isn't involved in this movie at all...
** His defeat involving [[spoiler:Fourze absorbing his WaveMotionGun thanks to an ally feeding it too him, which then goes downhill?]] It's not a far stretch from what happened in a [[Anime/TengenToppaGurrenLagann certain anime]] the writer was previously involved with.
* TheStarscream: To Foundation X. Once he gets what he needs, he wastes no time in betraying the organization for his own purposes.
* ThisCannotBe: His reaction to his defeat.
* [[spoiler: TimeStandsStill: He can do this using Poseidon's time-displaced Core Medals. It is ineffective against OOO Super [=TaToBa=] since those medals are from the future as well.]]
* WaveMotionGun: His ultimate attack. [[spoiler:Unfortunately for him, Nadeshiko allows Gentaro to absorb it and use it to destroy him along side OOO.]]

!! ''[[TheMovie Everyone Into Space]]''

!!Inga Brink
A mysterious but formidable woman who fights both Foundation X and the Kamen Rider Club in pursuit of her own goals. [[spoiler: She's actually the enemy of the Space Ironmen, who have deceived the KRC into restoring them to full power.]]
-> Live Actor: [[Series/CuteyHoneyTheLive Mikie Hara]]

* TheBusCameBack: for ''Movie Wars Ultimatum''.
* DarkActionGirl: She's tough as hell and can fight hand-to-hand on equal terms with Tatsugami and Ryusei. [[spoiler:Not surprising for the latter, considering they trained at the same martial arts school.]]
* HeroAntagonist: attacks the KRC because [[spoiler:the latter are {{Unwitting Pawn}}s to the Space Ironmen.]]
* {{Fanservice}}: Her default outfit is tight black leather and a low-cut tank top.
* PoorCommunicationKills: [[spoiler:If she'd just bothered to ''explain'' the situation, she'd have saved everyone a lot of trouble.]]

!! Groundyne and Skydyne
The Space Ironmen, a duo of immensely powerful robots constructed by Professor Blink, Inga's father. They turned against their creator and began a campaign to destroy humanity.
* BladesBelowTheShoulder: Skydyne
* BrotherSisterTeam
* [[spoiler: CuteClumsyGirl: Invoked by Skydyne's human form.]]
* EvilCannotComprehendGood
* {{Foreshadowing}}: Saeba always appears wearing [[RollerbladeGood rollerblades]], a hint to [[spoiler:his identity as Groundyne.]]
* NoHoldsBarredBeatdown: [[spoiler:After Gentaro gets depowered sending XVII to the moon, the Ironmen waste no time beating him and Meteor to a pulp.]]
* [[spoiler:RidiculouslyHumanRobot: They're able to disguise themselves as humans, and take advantage of it to fool the Kamen Rider Club into destroying their PowerLimiter on XVII.]]
* SealedInsideAPersonShapedCan: [[spoiler:The two of them were imprisoned in human form by Igna's father with his dying breath.]]
* [[spoiler:TransformingMecha: Groundyne can transform into a land vehicle and Skydyne can turn into a jet.]]
* WrestlerInAllOfUs: Groundyne

!! The Black Knight
The third of Professor Blink's robots. While his "siblings" rebelled against humanity, Black Knight alone remained loyal, and now works with Inga to stop them.
* ChestBlaster: Has machineguns built into the holes in his chest.
* HeroAntagonist: He initially opposes the Kamen Rider Club thanks to a misunderstanding.
* HeroicMime: Never speaks a word.
* TheJuggernaut: Nothing Fourze can throw at him bothers him too much.
* SacrificialLion

A massive satellite that serves as the Space Ironmen's ultimate weapon. [[spoiler: Secretly harbors the mind of Professor Blink, who uploaded himself into the station after the Space Ironmen turned against him, using it to seal way most of his rebellious creations' power.]]
* BeamSpam: It's absolutely covered in laser turrets on its exterior. They don't help all that much when the KRC attempts to board it.
* CompositeCharacter: In keeping with the old-school Ishinomori homages, XVII is based on ''Space Ironmen Kyodein's'' Gombess, the eponymous ''Daitetsujin 17'', hence the name, ''and'' (possibly) the BigBad of the latter series.
* [[spoiler:EarnYourHappyEnding:In the final his travel to find another friends in space]] and find [[spoiler:Nadeshiko]].
* FacelessEye: "Brain", its central control station, includes something that looks like a tree with every branch ending in a robotic eye. [[spoiler: One of those eyes is later used to communicate with Gentaro, explaining the station's situation to him.]]
* HeelFaceTurn: [[spoiler: As it turns out, he never willingly worked for the Space Ironmen. ]]
* PowerLimiter: [[spoiler: For the Space Ironmen. Sending the KRC after XVII was an attempt to destroy their limiters and return them to full power.]]
* TransformingMecha: Capable of shifting between satellite mode and [[HumongousMecha giant robot mode]] on command.
* WaveMotionGun: XVII is a satellite weapon packing a laser powerful enough to level all of Japan in one strike.