Characters: Kamen Rider Gaim Helheim Forest
Helheim is a mysterious forest entered through cracks in space, home to the Inves.
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- Alien Kudzu: Played for horror - more than usual, anyway. Most uses of this trope have it as a symptom of an alien threat; Helheim is the threat. It's an unfeeling force of nature, and Nature Is Not Nice.
- Arc Villain: Subverted. It only played the role of antagonist once in the short four episode span of the arc while Yggdrasil's Riders continued to play the role of antagonist.
- Assimilation Plot: Adds entire worlds to itself, converting all animal life in them into its Inves hordes.
- Big Bad: In a Big Bad Ensemble with Yggdrasill. It threatens to spread across the world. Worse, it's revealed that Earth isn't its first victim and that it's actually sentient.
- Bigger Bad: Though its presence is a looming threat that helps fuel the actual Big Bads.
- Blue and Orange Morality: According to its avatar Sagara, it only wants to bring about the next stage of evolution.
- Death World / Don't Go in the Woods: Any normal human that enters Helheim runs the risk of getting killed by Inves or eating a Helheim fruit and turning into an Inves.
- Eldritch Location: An unearthly forest filled with monsters and covered in alien plants that turn anything that eats them into more monsters. After The Reveal, it comes across as more like Eldritch Abomination. It spreads from planet to planet, dimension to dimension, overgrowing entire worlds and converting all animal life inside them into Inves.
- Expy: Eldritch Abomination that spreads from planet to planet, dimension to dimension, overgrowing entire worlds and converting all animal life inside them into monsters, seems familiar?
- Garden of Evil / The Lost Woods: Helheim is a forest teeming with murderous Inves all over the place and poisonous Helheim fruits growing amongst the trees and plants.
- Genius Loci: As revealed in episode #42 it's not only intelligent, it has an avatar in the form of DJ Sagara
- Holding Back the Phlebotinum: In a sense. Helheim is a dangerous planetary threat but it lost all physical menace around #20 as its Inves had degraded to mere mooks in power leaving Yggdrasill as the main physical threat. Then the Overlords are revealed and it becomes obvious that Helheim has not been displaying its full might.
- Humanity on Trial: According to Sagara, Helheim's invasion is a way to judge humanities worth in some way.
- Planetary Parasite: Overgrows entire worlds.
- The Prophecy: It is said repeatedly that Helheim will someday "choose" a particular individual. What this means is unknown at the moment, except that The Chosen One could be any of the Riders.
- DJ Sagara says that Helheim has a "forbidden fruit", and whoever gets it will gain great power. He says that Helheim grants evolution "to the ones worthy of ruling the world to come".
- Walking Spoiler: Its true nature is this.
The Monsters of the Week
summoned to fight in the Inves Game that dwell in the Helheim Forest. While the Inves Game is in action, they'll obey the one holding their Lock Seed and fight until ordered to retreat. However, should their wielder drop their Lock Seed, the Inves will go on a rampage and attack anything in sight. Some also emerge from dimensional tears that are opening to their dimension.
- Airborne Mook: Eating unripe Lock Seeds cause the Mook Inves to sprout wings in #3.
- Animal Motifs:
- Black Blood: They seem to possess this. Strangely, the only times you see it are in a fight scene with Marika in #22, and when Baron pierces Deemushu with an arrow in #26.
- Blade Below the Shoulder: The Byakko Inves had them. The Komori Inves just has one.
- Breath Weapon: The Seiryu Inves breaths blue fire.
- Broken Streak: Up until the debut of the Lion Inves, all of the Inves have had their species names be written by their Japanese names.
- Dark Is Evil: The Komori Inves.
- Degraded Boss: Inves that act as Monsters of the Week often reappear as Mooks in later episodes. The basic Inves as a whole are demoted to Elite Mooks by the Forbidden Fruit Saga.
- Evolutionary Levels: Keeping with the Mons theme, the Inves evolve as they eat more Lock Seeds, starting out as Elementary Inves, then evolving into Berserker-State Inves, and finally into an Evolved Inves. If an Elementary Inves eats a whole lot of Lock Seeds it skips directly to an Evolved Inves. And now there are Overlord Inves, which makes every other character look wimpy in comparison.
- Expy: While monsters being former humans is a Kamen Rider staple, the writer and the nature of The Reveal indicate they're stand-ins for the Witches of Puella Magi Madoka Magica.
- Flight: The Komori Inves.
- Frickin' Laser Beams: The Komori Inves can fire a BIG black laser beam when cornered.
- The Four Gods: The Byakko Inves from #1; The Seiryu Inves from #8. It's worth noting that these Inves are different from the other Inves, as they have armor that makes them look more like jade statues.
- Home Field Advantage: Kouta notes that the Inves are stronger in the Helheim Forest and it shows with Gaim, Ryugen, and Baron having trouble defeating simple mook Inves.
- The Horde: What the Inves can become when they get enough momentum going
- Implacable Man: The Seiryu Inves in it's first appearance, afterwards the cast figure out how to kill it fairly easily..
- Law of Chromatic Superiority: The red Lion Inves is the strongest Inves encountered yet, needing Jinba Lemon Arms to be taken down.
- Lightning Bruiser: The Evolved Shika Inves, the Seiryu Inves and the Lion Inves.
- Make Me Wanna Shout: The Komori Inves.
- Meaningful Name: #20 implies that Invess is short for the English phrase invasive species.
- Mons: A Deconstruction of the trope, as while they're loyal so long as you hold the Lock Seed that summoned them, drop it and they'll go berserk. Uncontrolled Invase can also appear on their own, and they're disease carriers.
- More Teeth than the Osmond Family: Those bulbous bodies on the Mook Inves? Those are all jaws.◊
- Nerf: It is established in #9 that Inves summoned by Lock Seeds are much weaker than Inves that come into our world directly. Best shown with the mutated Komori Inves that could fight both Gaim and Ryugen at once and it explains why the Byakko and Seiryu Inves were so much trouble.
- Nice Job Fixing It, Villain: The Lion Inves tearing off the Sengoku Driver's faceplate is what finally reveals the space for the Genesis Core.
- No Sell: The Seiryu Inves... until our heroes switch to blunt force weapons.
- Not-So-Harmless Villain: In its first appearances, the Komori Inves got stomped by Ryugen and Gaim on two separate occasions - the mutated one in #9 can fight both of them at once.
- One-Winged Angel: If one of the Mooks eats a mature Lock Seed, it becomes a full fledged Monster of the Week called a Berserker Inves. If one of those eats one, they turn into a giant monster called an Evolved Inves.
- If one of the Mooks eats a whole lot of Lock Seeds at once, they will evolve straight into their Evolved State!
- As #13 revealed, some Inves are this for humans like Ryoji. To clarify, humans can become Inves and gain more power, but seem to lose all sense of humanity, based off of how Inves-Ryoji was acting during #14.
- Playing with Fire: The Shika Inves can do this, as well as the Seiryu Inves, followed by the Komori Inves.
- Power Gives You Wings: The Lion Inves gains them after its Lock Seed malfunctions.
- Primal Stance: The Evolved Shika Inves resembled a primate more than a deer.
- Power Levels: Lock Seed classes play a vital role in how far the Inves evolves. Combining Lock Seeds also has that effect.
- Red Right Hand: The three Inves that are confirmed to have been human once all had their right hands formed differently than their left. The Byakko and Bixie had large claws, and one Komori had a blade-like talon.
- Technicolor Fire: The Seiryu Inves breathes blue fire as a sign of its power.
- Villain Pedigree: The non-Mook Inves slowly become Mooks themselves. This culminates in #33, where an Overlord acts as a Monster of the Week in their place.
- The Virus: Indirectly. Those injured by them seem to sprout or turn into Lock Seed plants, which in turn produce immature Lock Seeds capable of transforming people into more Inves.
- Was Once a Man: Some of them anyway, with two cases confirmed (Yuya and Hase), one suspected (a worker in #9), and who-knows-how-many-more possible.
- Whip It Good: How the Long-Horned Beetle Inves uses its antenna in battle.
The Overlords are all that remain of the alien civilization known as the Femushinmu. They are an elite category of Inves that managed to retain their intelligence and receive great power from their transformation, capable of controlling lesser Inves and the Helheim Forest itself.
- Aliens Speaking English: Subverted, they speak an alien language (though a cipher of Japanese). They have to learn Japanese, and even then they aren't Instant Experts except for Roshuo.
- Brilliant but Lazy: They have godlike power, but don't really do much with it. Beyond just power, Redyue is able to grasp the basics of Japanese in just a few hours and Deemushu follows shortly. Roshuo masters Japanese fluently in the same amount of time.
- Colorful Theme Naming: When translated from their Cypher Language.
- Cypher Language: After their first major episode, fans were able to translate their language back into Japanese.
- Disc One Final Boss: They act as the main antagonists for the mid point of the show, but are defeated before the final act leaving the Kamen Riders themselves as the final villains.
- Foil: Redyue notes that all Overlords are this to the Armored Riders. The Overlords survived Helheim by using its powers to permanently mutate into Inves, while the Armored Riders safely channel Helheim's power while retaining their humanity to conquer Helheim. Basically, the Overlords gave into Helheim while humanity conquered the forest.
- Go Mad from the Isolation: According to Redyue, living in the forest for so long has made them really, really bored. To the point where they attack Kouta and Kaito just to get some entertainment.
- Godzilla Threshold: As a faction they are this. They are so powerful that them mobilizing causes every active Rider to team up to defeat them (except Micchy, who joins them). And their defeat causes to Riders to turn on each other again.
- Green Thumb: They control the plants of Helheim the same way they control other Inves.
- Hope Crusher: The Overlords are very good at inspiring fear, causing Heroic BSODs, and driving people past the Despair Event Horizon. The funny thing is that half the time this is happening on accident.
- Ironic Nickname: Ryoma dubbed them the Overlords but in the end, they were just Helheim's pawns.
- It Can Think: And speak.
- Monster Knight: They wear armor and carry weapons, setting them apart from their brethren.
- Monster Lord: As their name implies, they are basically the rulers of Helheim.
- Orcus on His Throne: It would probably take a lot less than ten years for Helheim to overtake Earth if the Overlords were leading its invasion, yet they seem content to just sit around doing nothing, letting the forest do all the work. On the flip side, they also don't care to restrain Helheim either. This is all justified, as Roshuo doesn't want to take over Earth, but doesn't particularly care for humanity either.
- Similar Squad: To three of the four main Riders, and Lapis from the summer movie is considered to be the fourth. Their colors and regional armor designs are an almost exact match, and their personalities aren't too far off either. While they could easily come off as a set of Psycho Rangers, the more complex morality at this point in the series means not all of them are evil while not all their Rider counterparts are good.
- The Sociopath: All of them, save for Roshuo.
- Telepathy: They are able to communicate with each other through telepathy. Roshuo in particular is also able to Mind Rape the others through this.
- Time Abyss: How long they've been around is unknown, but, seeing as they survived the fall of their civilization, however long their civilization took to destroy itself, and for a long enough span of time that it's nigh impossible to tell Helheim was a civilized world at one time, they're most likely this trope.
- Was Once a Man: Like all Inves, but Overlords somehow gained great power from Helheim instead of becoming mindless beasts.
Portrayed by: Tomokazu Sugita (voice), Daisuke Satō (suit)
The first Overlord-class Inves introduced. Deemushu is bellicose and armed with a formidable array of powers.
Portrayed by: Kenjiro Tsuda (voice), unknown suit actor
The second Overlord-class Inves. Eerily similar to Ryugen in color and design. Redyue is calmer and much more intelligent than Deemushu, but is no less malevolent, wanting a 'toy' to alleviate the boredom of existing in Helheim for so long.
- All Your Base Are Belong to Us: In #32, Redyue has Helheim infect Yggdrasill tower, turning it into the Overlords' main base of operations on Earth.
- Admiring the Abomination: Inverted: the childish, sadistic Redyue reacts with glee when she sees how ruthless humans are when the world governments try to nuke Zawame City just to have a chance to kill her.
- Also inverted with Micchy. She finds his madness to be the most interesting thing it the world.
- Arc Villain: For the first half of the Forbidden Fruit Saga, after which Kaito takes over.
- Blade on a Stick: Wields a large halberd that doubles as a shaman's staff.
- Axe Crazy: She hides it better than Deemushu, but this bitch is fucked up in the head.
- The Baroness: A textbook Rosa Klebb: cunning, sadistic, and aggressively desexualised.
- Big Bad: While Roshuo is the leader of the Overlords Redyue is ultimately the one that is the true, ultimate villain of the faction and was an evil monster long before Roshuo ruined their world.
- Badass: Perfectly capable of fighting Kouta and Ryoma at once.
- Batman Gambit: All of #34 was a magnificent one of hers. By declaring war on humanity, she got them to try and use some ICBM's to kill her, which in turn forces Roshuo to get off his throne and act as a deterrent to future incursions, while at the same time bringing a good portion of humanity past the Despair Event Horizon once they see how powerful the Overlords are.
- Break Them by Talking: Tries to break everyone she talks too, but #41 was pretty much her being this trope with a heavy dose of Mind Screw.
- The Chessmaster: "Everything is moving as I desired."
- Chronic Backstabbing Disorder: And proud of it.
- Colorful Theme Naming: "Redyue" translates to "Hisui", meaning "Emerald" or "Jade".
- Contralto of Danger: Her voice is so deep that it almost qualifies to be a Badass Baritone.
- The Corrupter: To Roshuo. After she begins scheming he becomes much more villainous. She's also this to Mitsuzane finishing where Sid left off, she wants to complete his transformation into a complete and total villain so they're exactly alike.
- She tries to be this to Kouta in #40. It doesn't work, but she got closer than anyone else.
- Creepy Monotone: Her Contralto of Danger is always clipped and emotionless.
- Combat Pragmatist: Makes up for her physical weaknesses by using Helheim fauna traps and by using the terrain for cover.
- Curb-Stomp Battle: Considering all the crap she's put everyone through, it's actually almost disappointing how quickly Kouta took her down. Almost.
- Dark Action Girl: Capable of fighting Kiwami Arms and is quite possibly the most dangerous Overlord in terms of her threat to humanity.
- Despotism Justifies the Means: Redyue wants to take the Forbidden Fruit just to be king and wants to conquer Earth because she thinks it will be a nice new toy.
- Dragon-in-Chief: While Roshuo is the leader of the Overlords Redyue is the de facto Big Bad, being the one that's actually motivated to conquer Earth, and comes up with evil schemes, and acts as the invasions military leader.
- Evil Cannot Comprehend Good: The idea Kouta might be selfless enough to care about the people of the world more than himself or ruling the world never occurs to her. As a result, her attempt to tell him We Can Rule Together blows up in her face by convincing Kouta to be willing to give up his humanity to fight the Overlords and save the world, ultimately resulting in her demise.
- Evil Chancellor: Acts as Roshuo's in what's left of his Deadly Decadent Court.
- Evil Counterpart: To Ryugen, which is quite a feat at this point. Both are primarily green, have a Chinese armor themed design, and are insanely (as in literally insanely) manipulative.
- She is also one to DJ Sagara. He appeals to Rosho's morality and wants him to give humanity a chance, while Redyue tries to tempt him into complete villainy.
- Evil Feels Good: Gives an entire speech about how ruining peoples lives is the most satisfying thing to do.
- Evil Laugh: Whenever she finds a really interesting new toy.
- Really rips an epic one when she finally betrayed Roshuo.
- Evil Mentor: To Micchy. She wants to transform him into someone who's on "her level" as she puts it.
- Evil Sounds Deep: A Rare Female Example. That's what happens when you get a male voice actor to voice a female despot.
- She's a more cunning, feminine and intelligent Takeshi Asakura.
- Part of her backstory that she killed her parents upon becoming an Over Lord parallels that of Medusa and Yuno Gasai.
- What she does in #41 eerily parallels what Gremlin did in Kamen Rider Wizard. Bonus points that they are both primarily green in colouration.
- Famous Last Words: "I won't accept dying like this!"
- Faux Affably Evil: She always speaks in a soft spoken and controlled manner even when committing genocide.
- The Final Temptation: Gives this to Kouta in 40 by telling him the humans will no longer accept him now that he's an Overlord and that he should join her in ruling the planet.
- For the Evulz: Redyue lives by this trope. She flat out admits that the reason why she does anything is because she loves breaking people.
- From Nobody to Nightmare: She was once a village girl. Now she a monstrous sadist that is one of the greatest threats Earth has ever seen.
- I Gave My Word: Promises Micchy that she won't hurt any human chosen for his version of Project Ark. She breaks her word, but Micchy, being Micchy, doesn't care, thinking that they deserved it.
- Glass Cannon: Redyue is very fast, competent enough in close combat, and has enough destructive power to rival Kiwami arms, but compared to the rest of the Overlords she doesn't tank damage very well.
- The Heavy: Takes the role from Deemushu after Roshuo gives the official order to attack Earth, becoming the main face and power of Helheim's first actual military assault, giving the invasion a proper leader.
- Human Resources: Begins kidnapping humans to power a device that will revive Roshuo's Queen at the cost of God knows how many human lives.
- I Let You Win: Threw her fight against Sid and Mitchy in #31 so she could lead them to Roshuo and have him kill the two.
- Intrigued by Humanity: Seems so. The girl not only learned Japanese in what amounted to a day or a few days, but also seems to be the most fascinated by humans in general, especially when compared to her counterpart.
- In the Back: How she starts her murder of Roshuo.
- It Amused Me: Seems to be more this than Deemushu. While she does enjoy suffering, she seems to see no difference between learning Japanese and seeing a human beaten up so long as it alleviates her boredom.
- Last of His Kind: For about one and a half minutes.
- Mad Scientist: And it took her less than a day to get a doctorate in morally bankrupt science.
- Magitech: All of her mad science is created by combing Yggdrasill tech with her species mysticism.
- Manipulative Bitch: She's the master manipulator Micchy thinks he is. Every scene she's in she's manipulating someone: Roshuo, Kouta, Micchy, the governments of the world.
- Meaningful Name: Redyue is Overlord speak for Jade. Not only does she look like a jade statue, but all of the Green Inves seen have a jade statue feel to them, with Bixie having a brass coloring.
- Meet the New Boss: Takes the reigns from Deemushu as the main antagonist and proves to be infinitely more monstrous than he ever was.
- More Deadly Than The Male: The only confirmed female of the Overlords and is also the most sadistic and monstrous of the species.
- The Necromancer: Creates a machine that can revive the dead.
- Nerves of Steel: She keeps her cool, even when she's overpowered.
- Nice Job Fixing It, Villain: In #40, Redyue tried to get Kouta to give up his humanity and join the Invess side. It backfired on her spectacularly when not only does he not join her, him giving up his humanity granted him Overlord power - power that Kouta used to kill her.
- No-Holds-Barred Beatdown: She kills Roshuo by beating him to death.
- Not So Different: With Micchy, horrifyingly enough. Both are willing to manipulate and threaten others so long as their own goals are met, and both are psychopathic manchildren. The two even start to work together.
- Obfuscating Stupidity: Pretends to be a G1 Starscream in competence when she is actually a Cybertron level one.
- Out-Gambitted: By Roshuo.
- Psychopathic Womanchild: Type C. An intelligent sophisticated being that treats humans like they're her newest toys. Also has traits of Type E, as she seems to see little difference between learning Japanese and seeing a human hurt.
- Red Eyes, Take Warning: This trope even sounds like her name.
- Reminiscing About Your Victims: She enjoyed telling the story about how she killed her entire family way too much.
- Self-Made Orphan: She killed her entire family for fun stating that it was one of the most satisfying things she ever did.
- Serial Killer: Started out with killing her family and given how many "toys" she has played with, it's obvious that she didn't stop there.
- The Smurfette Principle: The only female Overlord revealed thus far.
- Softspoken Sadist: Speaks quietly and calmly, finds great pleasure in watching Kouta get beaten to a pulp and admits that her greatest joy in life is when one of her toys die from despair.
- Super Intelligence: Mastered most of Earth's languages in a couple of weeks and managed to adapt near-future Earth technology (which was way beyond her civilization's tech-level) into a machine capable of raising the dead in a matter of days.
- The Spock: Of the soulless sociopath variant.
- The Starscream: Micchy suspected the reason she led him and Sid to the Forbidden Fruit was to kill Roshuo. She could then finished off the duo and have the Forbidden Fruit for herself. This fails, considering it's Roshuo.
- I Surrender, Suckers: An odd example. Redyue surrenders, but doesn't strike back. Instead leading her opponents to Roshuo so that he can kill them. She gets interested when one of them refuses to go and cites it being a trap.
- This Cannot Be!: Her last words before Kouta finishes her off for good.
- Take Over the World: Wants to conquer Earth for herself solely because she's begun to find Helheim boring and wants to see what its like to rule a concrete jungle.
- Uriah Gambit: Tricks Sid into fighting Roshuo to see what would happen.
- Victory Is Boring: Because there are no more lives to ruin.
- Villain Takes an Interest: Yet another villain that finds Micchy interesting; this will not end well.
- Villainous Breakdown: After backstabbing Roshuo and finding out the "Golden Fruit" she took from him was a withered husk. She goes utterly berserk, in direct contrast to her normal calculating demeanor.
- Vocal Dissonance: Redyue is officially a girl, but she doesn't sound like one.
- We Can Rule Together: Offers Micchy a chance to become her right hand man so he can control humanity while she toys with it. He accepts.
- Also attempted to do this to Kouta, stating that no mater what he does, humanity will reject him in the end. He tells her where to stick it.
- Women Are Wiser: Both the only female Overlord and the smartest by far, capable of feats of outright Super Intelligence.
Portrayed by: Joji Nakata (voice), Yasuhiko Imai (suit)
A white-colored Overlord. He is Deemushu and Redyue's superior and the "King" of the Overlords, and by extension of Helheim and the Inves.
Over Lord Queen
Portrayed by: Hiromi Iwasaki
The deceased wife of Roshuo, who originally granted the Golden Fruit to him. Roshuo is desperately trying to resurrect her.
- Affably Evil: Compared to the rest of the minor Overlords.
- Avenging the Villain: States part of the reason he wants to see Kouta dead is to avenge Demuushu.
- Badass: As an Overlord this is a given and he could have killed Kouta if Micchy hadn't interrupted him.
- Breath Weapon: He has fire breath, to be exact.
- Combat Pragmatist: He set up a trap to lure Kouta into ahead of time.
- Cool Sword He can even deflect lasers with it, Jedi style.
- Feathered Fiend: He is based on a phoenix.
- The Handler: Micchy notes that he's this to him. Which is why he gets killed.
- Human Shield: Inves Shield. Zangetsu Shin uses him as this in #33 to escape Gaim's finisher, resulting in the Overlord's death.
- Meaningful Name: His name translates to Suzaku.
- Monster of the Week: Justified for three reasons. First, he's a minion of Redyue. Second, Kouta's Kiwami Arms make him as powerful as an Overlord. Third, Micchy wanted him to die because he was his handler.
- True Companions: A rather twisted version of the trope, and not just because he's a villain. He wants to avenge Deemushu by killing Kouta and states that the death of a human is nothing compared to the death of an Inves, though the real cake comes in #40 where, in the dreamworld that Redyue makes, he and a Seiryu Inves hold off Zack and Minato so that Kouta can run off and rendezvous with Redyue and Shinmugurun, explicitly telling Kouta that his fellows await.
- We Hardly Knew Ye: Only got two episodes and in one of them he was already dead.
- Badass: He was able to hurt Kouta in Kiwami Arms. Who knows how their fight might have gone if Kaito hadn't interfered.
- Blind Obedience: Obeys his lord, even when its a suicide mission.
- Bullfight Boss: Literally! He's a bull monster too powerful for Kouta to fight directly, so he counters with misdirection to set up the finisher.
- The Dragon: Seems to be Roshuo's sworn sword but he's been put on loan to Redyue.
- A Load of Bull: His animal motif.
- Man in White: Pure white armor, unlike Roshuo's battered chalk.
- Monster of the Week: Subverted, when he was protected from Kouta's finishing move by Redyue. But he didn't last long in the next episode.
- Sinister Scimitar: A big boned-themed one.
- Undying Loyalty: He will follow the orders of the one declared his master, even if they're suicidal.
- Use Your Head: The method of attack that can hurt Gaim in Kiwami Arms.