History Fridge / KamenRiderBuild

*** Since this is the Hyper Battle DVD form, it looks like it's a reference to ''Televi-Kun'', the magazine which is often involved in the Hyper Battle [=DVDs=]. Reverse the word order for this form, and you get "Televi-Ku'''ma'''".

*** Alternatively, it could also be a ''Series/KamenRiderFaiz'' reference, especially considering how the combination and the Build Driver itself was designed by a man named TAKUMI Katsuragi.

*** An alternate [[Series/KamenRiderFaiz Kamen Rider Orga]] also served AR Otoya. The original Orga's alter ego? It's Yuji Kiba.

** While he isn't this at first, by the time Rogue gets a Driver all his own, he fits the model of Frankenstein's Monster, an experiment gone [[JustForPun rogue]] that intends to kill the scientist responsible for its birth.

*** Or a reference to [[https://tvtropes.org/pmwiki/pmwiki.php/RareGuns/Handguns Desert Eagle]]?

*** They also both have Super Sentai teams associated with them.

*** Alternatively, a foreshadowing of Sawa getting turned into an octopus-like Smash, with lightbulb representing camera's flash used by reporters.

*** Might also be a reference to [[Series/UchuSentaiKyuranger the Sentai series that was airing alongside Build]] before [[Series/KaitouSentaiLupinrangerVsKeisatsuSentaiPatranger Lupinranger VS Patranger]] took over as Build's SHT partner, which does have a phoenix-themed robot. Especially since the Phoenix bottle is red with black "liquid" inside, and red-black is the colors of the suit for the Ranger of said phoenix-themed robot.

*** Or it could just be a Series/KamenRiderFaiz reference, especially considering how the combination and the Build Driver itself was designed by a man named TAKUMI Katsuragi.

** [=KumaTelevi=] (Bear + Television): Perhaps a reference to [[VideoGame/Persona4 Persona 4]].
*** Since this is the Hyper Battle DVD form, it looks like it's a reference to Televi-Kun, the magazine which is often involved in the Hyper Battle [=DVDs=]. Reverse the word order for this form, and you get "Televi-Ku'''ma'''".

** [=ToraUFO=] (Tiger + UFO): Both attack unseen, tigers when they ambush their prey and [=UFO=]s when they abduct people. Or they both could go [[AnimalJingoism for]] [[AliensStealCattle cattle]].

** [=Super Hero Time=] (Franchise/SuperSentai + Franchise/KamenRider): Both air in the one-hour long programme block on the Japanese television network, TV Asahi, which air the new weekly episodes of the Super Sentai and Kamen Rider series.
** [=ButtobaGanba=] (Kamen Rider Buttobasoul + Kamen Rider Battle: Ganbarizing): Both are Kamen Rider-based arcade games.

** Also, one of Build’s main themes is [[WarIsHell war and its effects on people]]. Now, with the [[Anime/MobileSuitGundam Gunpla runners]], what was its origin series’ [[AnAesop Aesop]] again?
* Build's symbol is this. The circular part resembles the Yin-Yang symbol, as in two opposing halfs (organic and inorganic) coming together to make a unified whole.

* Build's suit looked a little weird when I saw it. With the color of the mask on the right being on the left hand and vice versa with the left. At first I thought it was because it was to help distinguish from W, but then it hit me. Our brain is ''cross-wired''. Meaning that the right side of the brain controls the left hand and again vice versa, which explains why the suit is like that!
** There's possibly another reason that explains why the legs are as mismatched as the top body: when you connect the body parts with the same colors as points(head half, then body half and leg), they form left(biotic Halfbody) and right(abiotic Halfbody) arrows, as in the order of the Fullbottles in the Driver.
* Just a little one for science/math geeks but R/T's finisher is a literal linear equation.
** Here's the thing about how the graph works - for every increment in the value in the original equation, the answer will grow lower and lower by decimals ''without ever actually reaching zero'', which is why the line tapers off and runs off horizontally. The theory being that the line ''will go on forever without touching the value of zero''. After [[Series/KamenRiderGhost two past]] [[Series/KamenRiderWizard Kamen Riders]] have had a final form associated with infinity, it's fun to see a Kamen Rider who's ''weaponised the concept of infinity.''

** It even fits with the true meaning of the Fullbottle Best Matches. Ryuga has part of Evolt's DNA, a creature that Sento eventually destroys.

* Why make the 'pet' looking after Ryuga a dragon? Sento had already noted that the Dragon bottle fits with 'ryu' (dragon) in Ryuga’s name, so he decided to grace his jumpy partner with another dragon.

* [=KeyDragon’s=] Vortex Finish doesn’t seem to have any scientific equations, graphs, or formulas appear. Just a chain and some fire. Make sense though, since dragons are mythical.

*** Then again, this can't explain why [=SmaphoWolf's=] Vortex Finish doesn't seem to have any scientific equations, graphs, or formulas appear. Only spinning application icons to trapping the target(s) and then summon a black wolf silhouette to attack them. All while the wolves are real-life animal.
*** It can be a reference to the [[https://en.wikipedia.org/wiki/Zoetrope zoetrope]], an early animation device that produces the illusion of motion by displaying a sequence of drawings. See how the wolf is running around with afterimages along the icons.

** Also, the only ape species represented by a Fullbottle is the Gorilla. When used, it increases Build's punching power. Now, what is Banjo's main form of combat?

[[AC:FridgeBrilliance]]

** [[spoiler:And the ultimate enemy Build fights? A planet destroyer with the power to create black holes, one of the most destructive powers known to mankind!]]
** And how does Build, the creator, beat him? [[spoiler:By creating an entirely new universe, the ultimate act of creation!]]
*** Although it comes with a little spin: [[spoiler:he did technically has to ''destroy'' his own universe to do so, but the end result leads to the creation of the new universe. And while he fails to completely finish off Evolt, at the end of the series Evolt is so severely weakened that he becomes a non-issue]].

* At the first glare, Fullbottle combos that make up Best Matches might look random [[spoiler:and as revealed in #41, the Inorganic Bottles side actually are mostly random as well as the pairings]], but there are actually some connections between them:

*** [[spoiler:Based on full bottles' origin, gorillas are strong, but diamonds are ''stronger''.]]

*** [[spoiler:Based on full bottles' origin, long-ranged weapons can take out something that's too far to reach. The many bullets shots from Gattling also helps to eventually hit something that moves fast.]]

*** Or maybe a foreshadowing of [[spoiler:Sawa getting turned into an octopus-like Smash]], with lightbulb representing camera's flash used by reporters.

*** Or it could just be a Series/KamenRiderFaiz reference, [[spoiler:especially considering how the combination and the Build Driver itself was designed by a man named TAKUMI Katsuragi.]]

*** [[spoiler:Based on the full bottles' origin, time will tell how long before the turtle expires.]]

*** Perhaps even a reference towards [[spoiler:Sawa's identity as a fake reporter spy, who did bug the Nascita base.]]

*** [[spoiler:Based on the full bottles' origin, if you can't hit what cannot be normally seen, try using in indirect measure.]]

*** Further supported by [[spoiler:full bottles' origin--by killing the dinosaur to use it to fuel cars, the latter is in a way responsible for the destruction of the former.]]

** It even fits with the [[spoiler:true meaning of the Fullbottle Best Matches. Ryuga has part of Evolt's DNA, a creature that Sento eventually destroys]].

* Blood Stalk/Evolt is themed around snakes. Banjo's Rider forms are all themed around Eastern ''serpentine'' dragons. Interesting foreshadowing [[spoiler:because the two of them are father and son.]]
* Episode 8 heavily implies that Soichi's the one responsible for every disguise Ryuga has been wearing. Considering Soichi himself has been in hiding from both the government [[spoiler:after the Pandora's Box incident]] ''and Faust'' [[spoiler:after rescuing Misora]], it's not a huge stretch to assume that ''he had to use them too.''
* I just came with this idea, but at least some of the Best Match Full Bottles are not only associated by some similar properties, but also related ''scientific'' topics:

* Why do the newer upcoming Riders [[spoiler:and Rider upgrade]] use Sclashjellies instead of Fullbottles? When some liquids are condensed/concentrated they congeal into jelly. The Sclashjellies are Fullbottles that have been purified even further.

* [[spoiler:Sawa becoming an octopus-like Smash]], octopus is known for it's amazing camouflage in hiding itself, a spy needs to hide his identity well enough. Also [[spoiler:her hair curls]] seem to invoke an octopus and it's tentacles.
* Blood Stalk being TheStarscream to Faust [[spoiler:and betraying the heroes by being Soichi]] makes a lot of sense, given his snake theme. After all, if someone is a liar or particularly deceptive, you might call them a snake, or "a snake in the grass".

* As mentioned in MythologyGag, the Hokuto Three Crows' names can be a reference to Series/KamenRiderKiva aside from being led by a character whose actor also played Otoya Kurenai.

** [[spoiler:They were all killed eventually. What do you call a group of crows? A ''murder''.]]

* In episode 21, it's fitting that the bottles Sento used to transform again after his HeroicBSOD due to [[spoiler:killing Aoba]] is Phoenix and Vacuum. Phoenix represents rebirth, and vacuum represents cleansing.

* ''Misora'' can be a transliteration of the Japanese pronunciation of the syncretic god Mithra (think VideoGame/AsurasWrath), who is a WarGod like Mars but also a god of the sun, light, goodness, courage, friendship, truth, order, and justice. It's also a root word for the term Mithridatism, from Mithridates (a name that means "given by the deity Mithra") VI of Pontus, which is the practice of protecting oneself against a poison by gradually self-administering non-lethal amounts and Mithridate, a semi-mythical medicine, [[spoiler:referencing her [[HealingHands healing powers]]]].

* The entire storyline after [[spoiler:Hokuto declares war with Touto]] is very definitely making a statement on [[spoiler:the pressures and horrors of war that are put on its soldiers and its victims]], but the most interesting addition to the equation is the Sclash Driver, which seems to be a take on soldiers who become desensitized to fighting the enemy or violence in general, as well as the pressure put on them to keep going. Fullbottles won't work with it normally; only Sclash Jellies will do, and the only two that are known to exist are Robot (Known for being emotionless performers of a given task) and Dragon (Known as being cool, powerful creatures of destruction.) Compared to the Build Driver, the Sclash Driver sounds far more aggressive and badass, and the jellies are smashed by two pneumatic presses in the driver itself. They also have a dangerous issue of causing an adrenaline rush in the brain that drives the user to get in constant fights no matter how dangerous it is to their body or their mind. [[spoiler:The only Fullbottle known to work with the driver and induce a transformation is the Crocodile Fullbottle, which is heavily cracked, and is currently in the possession of a man who submitted himself to hellish training conditions and broke himself trying to fit into a mold he wasn't entirely prepared for: being a soldier. Or in this case, a Kamen Rider.]]
* There might be a reason [[spoiler:only the Crocodile Crack Fullbottle]] can be used in the Sclash Driver.The Sclashjellies themselves are gel-like substances contained in a flexible bag, so the Sclash Driver can just squeeze the gel out of it. The Fullbottles however are hard-plastic water bottles, the liquid cannot be forced out by the press mechanism. However, if the water bottle is cracked, the liquid inside will slowly ooze out of the container via the cracks.

** Sento may have a bit of an [[InsufferableGenius ego]] at times, but he is overall a [[ThinkNothingOfIt sweet, kind person]]. [[spoiler:It was later revealed that Takumi Katsuragi, the original Build and Sento's true identity, who despite his heartless and emotionless attitude originally developed the Rider System in order to defeat and destroy Evolt and carry on his 'dead' father's goal.]]
** Ryuga counts too, even though he can be a [[JerkWithAHeartOfGold jerk]] about it and his ways often [[NatureVersusNurture oppose]] Sento to explosive results. [[spoiler:However, he does show more selflessness near the final third of the series, especially when he risks himself to rescue Sento who had been possessed by Evolt in #36, and to sacrifice himself to trap Evolt between the wormhole to ensure the two worlds collided in #48.]]
** Kazumi has to be viewed from the point of the Three Crows as he indeed is [[BenevolentBoss selfless]] and [[TheLeader heroic]] to them. It also then carries over to his [[spoiler:actions after the rise of Evol, and carries over to his sacrifice as Grease Blizzard]].
** So why Gentoku is a Kamen Rider? Simple, [[ItsAllAboutMe he thinks]] he is the hero of the story and he calls himself so. Then comes TheReveal that [[spoiler:he IS one ever since his Hazard level nullified the HatePlague as more of an AntiHero who wants to unite the country so his father can run it by playing the villain]]. And he plays the trope straight when he [[spoiler:sacrifices himself to stall Evolt for Sento's plan]].
** [[spoiler:Shinobu Katsuragi as the other Build may also be seen as evil at first, but it was later revealed that he was working with Evolt in order to end him after his first defeat, making him more of a WellIntentionedExtremist who's willing to do anything to get the job done, but he is still one of the most morally ambiguous of the Riders that aren't evil, since he still let many atrocities happen for his plans to take place.]]
** [[spoiler:Utsumi as Mad Rogue also seemed villainous at first, working with Evolt and doing amoral tasks for him such as attacking civilians, but in the end it was revealed he worked with Evolt in order to kill him to avenge Namba's death. However, he is still one of the most morally ambiguous of the Riders, maybe even more than Shinobu, because he didn't truly justify his actions out of a sense of justice like the four heroic Riders or a well intentioned goal like Shinobu, but more out of vengeance.]]
** [[spoiler:After the reveal why the three Riders above weren't truly evil, but still morally ambiguous, it's clear the only rider that is truly evil is Evolt, because the Rider System the other riders are using are based on the Evol-Driver (the Build Driver being a knockoff of the Evol-Driver, the Sclash Driver being a creation Evolt spread to the other nations, and Utsumi using the Evol-Driver himself). This means they are truly fighting against the evil origins of their drivers and showcase the PhlebotinumRebel trope which is repeatedly shown throughout the entire franchise.]]

** [[spoiler:Evolt represents the GeneralRipper who would employ, fund, or otherwise direct the MadScientist to create monsters.]]
* Looking back, one can observe that whenever Sento is under pressure, he shows a lot of DissonantSerenity as a coping mechanism. Taking this into account, [[spoiler:the fact that Takumi Katsuragi is almost always in this state could mean that his father's death had such a negative effect on his mental health he was ''stuck in this state'' for what appeared to be ''several years'', until his own 'death'.]]
* Of the 4 heroic Kamen Riders, [[spoiler:Gentoku]] stands out for being the only one not to have a Kanji for a certain animal in his name - Sento, Ryuga, and Kazumi have the respective kanjis for To (Rabbit), Ryu (Dragon), and Sa (Monkey)[[note]]from Sawatari[[/note]]. [[spoiler:He's also the only one to start off outright villainous, and the only one who uses a Sclash Driver but not a Sclash Jelly]].

* We see a constant running gag that Owner has no clue how to make coffee, even to the point of Sento questioning why he has a shop at all. It makes sense that [[spoiler:an alien]] has no clue about human tastes and food.
* In the early episodes, most of the battle setup had Sento vs Night Rogue and Ryuga vs Blood Stalk. Then it turned out the match between Ryuga and Stalk makes sense given [[spoiler:they are both aliens.]]
* Episode 35 bring us a new light about why [[spoiler:Evolt-possessed]] Soichi Isurugi named [[spoiler:memory-deleted Takumi Katsuragi with the face of Taro Satou as]] Sento Kiryu. Not only because [[spoiler:manipulative nature of Evolt to renaming Takumi just like the last season's big bad does as]] Sento's name consisted of the first kanji of 戦車 / [=SENsha=] / tank and 兎 / TO / rabbit, which literally means "war rabbit" or "war hare", exactly what [=RabbitTank=] is, but also [[spoiler:because Sento is a kana away from "Sentou" / 戦闘, which properly means "war" or "battle". In #35, Evolt keep ranting about Sento's belief of humanity and science, said that science only makes war in the end. The fact that Evolt-possessed Soichi before and after The Reveal always encouraging Sento to create more new equipment, and also his speech to Sento about the difference between Sento and Ryuga before he gave Sento the Hazard Trigger, concludes in two things: He made Sento a personification of War, and he personally nurtured the War itself!]]
*** "Kiryu" may have been a random name that Soichi/ [[spoiler:Evolt]] randomly chosen until you realise what pronouncing them sounds like. The "Ki" is similar to the word "Key" while "Ryu" basically means "Dragon", now which one of the Best Matches has both of them?
* In #36, Sento’s form when [[spoiler:possessed by Evolt]] consists of his white hair and occasional red eye. It seems to stand out compared to when [[spoiler:Evolt possesses Ryuga and Soichi]], but there is a reason why. There are rabbits that are not only white in color, but said rabbits have red eyes!

* [[spoiler:At first I was confused by the suit of Kamen Rider Mad Rogue. In my mind it didn't really have the proper colors for the bottles it used. It only had a little purple and was mostly white, contrasting how the Bat and Engine bottles are purple and red, respectively. Then it hit me; Utsumi previously used the Faust Bat bottle (purple) and the Gear Engine (white) before. Both of those carry the essences of the original Full Bottles, but still 'stained' his body enough so that when the Evol Driver gave him a form, it was altered based on the other versions rather than the originals.]]
** Also, remember that Katsuragi mentioned the Build System is to '''create''' whereas Evolt and his Driver represents '''destruction'''? Using a Best Match in Evol Driver doesn't create a half-to-half configuration like Build, instead, a symmetrical form was made because the Driver scrambles and mix them back into a single Rider. This is to indicate that something that was purposed for destruction cannot be used as an object of creation.
* When the opening got updated in #29 to include Sawa and Kazumi. At first I was confused at the begin part with the characters showing up in the screen molds being Ryuga, Misora, Kazumi, Sento and for some reason Gentoku who is an enemy [[spoiler:at the time]] instead of Sawa who has cemented herself as part of their family. But after #36, it became clear that they represent the people who can fight and oppose [[spoiler:Evolt]] directly. Four of them being Kamen Riders and Misora having the powers of [[spoiler:the Queen of Mars, Vernage]].
* [[spoiler:Takumi reappearing and possessing Sento's body again before Sento came back to achieve his final form was this season's way of doing the 'kill the Rider-resurrect him before final form' gimmick.]]
* [[spoiler:The three people affected by the light of the Pandora's Box, Gentoku Himuro, Yoshiko Tajimi and Masakuni Mido later become what they developed for the war. Gentoku focused on developing the Rider System so he became a Kamen Rider. Yoshiko focused on developing more powerful Smash so she became a Smash. Masakuni developed nothing for the war so he literally became nothing.]]
* Another possible reason [[spoiler:Takumi cannot use the Genius Bottle? When we see inside the head of the man, we see that the gears in his mind have stopped and they only start moving again when he gives control back to Sento. Takumi was also too focused on his goal of defeating Evolt, to the point he was willing to kill Banjo on the off chance he turns back into Evolt, that he created dangerous inventions like the Hazard Trigger, inventions that could only be used as weapons. The Genius Bottle didn't recognize Takumi, who became a demon unable to think beyond his goal of defeating Evolt, as a true genius. The more heroic Sento, who truly thinks about others and uses his intelligence to better mankind, was the one who truly deserved the title of Genius.]]
* The Hazard Trigger and the Genius Bottle could represent the two kinds of scientists. The Hazard Trigger represents scientists like Takumi or Utsumi who pursue science and do all kinds of experiments simply cause it interested them or stroked their ego, possible repercussions be damned, and one day, they'll find their experiments go out of control. The Genius Bottle, however, represents scientists who use their intelligence to better all of mankind and refuse to do less than moral experiments for science's sake. [[spoiler:When they're used together to 'purify' a Lost Bottle, it can be seen as a compromise between the two types, a scientist that does questionable things for the betterment of mankind.]]
* Of course Banjo has no brains, [[spoiler:Evolt is the one who got all the brains when they became individual beings.]]
* Most of the transformations, even the more higher tier ones, use only one or two Full Bottles at most. [[spoiler:So what does that say about the strength of Build Genius, which has sixty Full Bottles directly attached to the suit?]]
* Kamen Rider Rogue's "broken" motif, on one level, represents the harsh treatment that Gentoku had to undergo to raise his Hazard Level and become a Rider. On the other hand, it could also represent kintsugi, the Japanese technique of repairing broken pottery with gold, to embrace the imperfections and flaws. [[spoiler:Referring to the fact that Gentoku's breakdown was necessary for him to throw off the influence of Pandora's Box and eventually become a hero.]]

* After seeing Gentoku's [[RummageSaleReject choice of clothing]] [[spoiler:after being freed of the influence of Pandora's Box]]. It makes sense why he used to sit on that ''incredibly'' tacky chair as Night Rogue.
* With the revelation of the true nature of the Best Matches revealed in Episode 41, it suddenly makes a lot of sense why so many of the Best Matches seem like random combinations. [[spoiler:It's because they mostly ARE completely random combinations!]]
* With the information that Best Matches are really [[spoiler:thirty things Misora liked being destroyed by thirty random weapons and objects, how do some of the more random combinations like Lock and Dragon or Unicorn and Eraser fit this new theme?]]
** Dragon and Lock: [[spoiler:Dragons are traditionally written to live in caves filled with their treasure. Locking up the entrance would mean the dragon would be stuck in the cave and starve to death.]]
** Unicorn and Eraser: [[spoiler:Unicorns are fictional creatures and so, they usually only exist as drawings drawn by a young girl like Misora used to be. An eraser would be used to cruelly erase a little child's drawing of a unicorn.]]
** Phoenix and Robot: [[spoiler:A beautiful and fantastical bird that is free to fly wherever it wants is killed by a completely non-magical and cold weapon that only does what it is told to do, and as robots don't die of age, no matter how many times the phoenix resurrects, the robot will always be there to kill it.]]
** Rose and Helicopter: [[spoiler:Imagine a beautiful field of blooming roses. Now imagine it being cut down by the blades of a helicopter.]]
** Octopus and Light Bulb: [[spoiler:Put an octopus under a heat lamp and sooner or later, it will dry up and die.]]
** Pirate and Train: [[spoiler:A pirate is utterly powerless to stop a land vehicle like a train and will be ran over by it; alternatively, with the birth of locomotion, ships as exportation means started being used less and less. Having no loot to plunder, traditional piracy itself eventually died.]]
** Ghost and Magnet: [[spoiler:A ghost's existence may be proven false by skeptics claiming magnets were used to simulate the effects of a haunting.]]
** Ninja and Comic: [[spoiler:A ninja could have their name publicized, leading to someone tracking them down and finding them.]]
** Hedgehog and Firetruck: [[spoiler:It's very possible the water pressure from a firetruck's hose could kill a hedgehog. Either that, or the firetruck can just run over the hedgehog.]]
** Dog and Mic: [[spoiler:Dogs have sensitive hearing, so shouting loudly into a working and plugged mic would be disastrous to them.]]
** Turtle and Watch: [[spoiler:As old as turtles can live, they can still die to old age.]]
** Spider and Refrigerator: [[spoiler:Spiders will freeze to death if you put them in a fridge.]]
** Whale and Jet: [[spoiler:A jumbo jet can lift up a whale out of water, slowly killing them like a beached whale.]]
** Deer and Pyramid: [[spoiler:Pyramids are found in deserts, and deers can't live in deserts.]]
** Scorpion and Gold: [[spoiler:A gold bar is very heavy. Drop one on a scorpion, and it goes splat.]]
** Wasp and Submarine: [[spoiler:Submarines are made for underwater exploration, while wasps aren't.]]
** Panda and Rocket: [[spoiler:Pandas would likely not be able to survive going into space on a rocket; alternatively, a panda would die if one was to fire a rocket launcher in it's direction.]]
** Lion and Vacuum: [[spoiler:A strong enough vacuum would be able to take away a lion's oxygen supply, and the lion would die from lack of breathing]].
** Giraffe and Fan: [[spoiler:A sharp enough fan blade could ''decapitate'' a giraffe]].
** Dinosaur and F1: [[spoiler:If the dinosaurs didn't die and become oil, Race cars wouldn't have fuel]].
** Santa and Cake: [[spoiler:Feeding Santa with too much cake would cause him to become obese and eventually die from related health complications]].
** Bear and Television: [[spoiler:Bears could have their habitat broadcast on television, leading to poachers tracking them down and killing them.]]
* Early on, it's established the Trans Steam users have the ability to mask their voice. While that explains why Night Rogue's voice sounds garbly, it doesn't explain why Blood Stalk's voice is so different from its wearer that a completely different voice actor is used... [[spoiler:It's the first clue that there's more to Stalk than meets the eye]].
* Cake should not have been inorganic as all the ingredients used to make it has to be organic (flour, sugar and even fruits). [[spoiler:However, #41 reveals that Fullbottles are not really categorized that way; cakes are probably what Soichi thought off as a way to get rid of Santa Claus.]]

* Sometime after gaining the Evol Driver and transforms into Mad Rogue, Utsumi was shown having his own doubts first before reaffirming that his path was right. At first it seemed as though that he rather side with the heroes than being a coward working for Evolt. [[spoiler:Once #47 came in, everything resolves in full circle: Utsumi wanted to undermine Evolt from within and feared that his cover would be exposed until he discovers Shinobu working undercover as well, so this gives him the confidence to continue scheming until the right time comes]].
* While it is indeed true that the Best Matches were of [[spoiler:sinister origins]], ever since Sento took possession of them, [[spoiler:they symbolized many of the noble traits he and his friends possessed]].

** '''Taka + Gatling:''' = What do you call a noble bird (''hawk'') with the power to defend the weak (''gatling gun'')? A GuardianAngel.

* Originally, when [[spoiler:[=RabbitDragon=] debuted in episode 49 of Build]] people were confused as to why it played both the Trial Form sound and the Best Match sound. However, the official website and multiple people on Twitter have explained why the [=RabbitDragon=] jingle is a Best Match: it is naturally a Trial Form due to there being two Organic Fullbottles, but because of Sento's compatibility with Ryuga, it is forced into a Best Match!

* At first, it might confuse multiple people that [[spoiler:Kamen Rider Rogue's new form in the Hyper Battle DVD, ''Prime Rogue'', is based off the Build Driver, and not the Sclash Driver]]. However, it makes sense if given a deeper analysis from multiple aspects:

* How is Ryuga able to figure out what the Best Matches are in one guess? Simple - [[spoiler: remember, he's part Evolt. While he may call it a sixth sense, it's possible that he may be unconsciously recalling the combinations that Souichi gave Evolt thanks to that part of Evolt inside him.]]

[[AC:FridgeHorror]]

* Since the opening of the Pandora Box made everyone present have their aggressiveness and other negative traits within them magnified you wonder if some of these people were once decent and nice people before the Sky Wall Disaster eventually turned them into worse people. Makes you wonder if people like [[spoiler:Gentoku and Soichi]] were once decent people before the Pandora Box was involved, with even Soichi admitting that the Pandora Box did a number on his mind when he touched it.
** [[spoiler:Confirmed with Gentoku and Yoshiko. When they both got cured of the HatePlague, they had a big MyGodWhatHaveIDone moment and now have to live with what they did. While Soichi was possessed all the time by an evil alien that wants to destroy the planet.]]

* Despite how much of a genius physicist Sento is, his amnesia actually makes him disturbingly similar to Misora; they're both children inside, despite their older bodies. Misora never got the chance to grow up, and Sento has to grow up from scratch. He's technically only one year old at best. They're both children who are thrown into a conspiracy and eventually [[spoiler:they're in a war they wanted no part in, but [[ItsAllMyFault directly blame themselves]] for and Sento [[BreakTheCutie ends up killing someone]].]]

* The fact that it was Soichi who [[spoiler:named Sento takes on a new twist with his attitude that the Riders are simply weapons, after all he literally named him "Rabbit Tank"]].
* Its more Fridge Squick but [[spoiler:we cannot deny that Banjo's origin story involves an alien slug thing slithering into a woman's vagina.]]
** Not likely, as [[spoiler:Stalk intended to possess Banjo's mother himself, but did not account for her pregnancy.]]
* [[spoiler:Most likely Sento Kiryu would come back but that would mean Takumi Katsurugi would had to "disappear/die" again as all intents in purposes they are really more like separate people in the same body. While it would be great for the Nascita crew, friends and allies as Sento can handle the Build System better at its current state and they trust Sento more the fact that Takumi would had to technically speaking have to give up his existence so the person the crew want would be back is kind of sad. He didn't choose to lose his memory and his face be changed and lose his identity as Takumi. Maybe Takumi wasn't the greatest person in the world but he wasn't totally heartless either and being erased like that its kind of unfair to him.]]
** [[spoiler:slightly downplayed compared to how you wrote it. He isn't 'gone' per se, rather he's become one with Sento, albeit with Sento as the dominant mind in the fusion. The ultimate difference between Sento and Takumi is their experiences and how the world has treated them. Takumi lived a life of ridicule and humiliation from his father being bashed constantly after the Skywall disaster and his subsequent supposed 'suicide'. Sento has had support from Soichi and Misora most of his 'life', from the beginning in fact, and was given a heroic ideal to follow. They are the same person in almost every other regard, and ultimately Sento's heroic determination and trust in his friends meant that he's the one needed to control the fusion. Technically parts of Takumi still exist inside of Sento, but we may see them more as the show goes on or in the movie.]]
** It continues even more in the Build tribute in the second episode of Kamen Rider Zi-O. Because of the fact that [[spoiler:this version of Katsuragi Takumi did not have to go through his fight with Evolt, the Skywalls, Faust, and his father's supposed 'suicide'. Thus, he doesn't have the tragic backstory his original self have, and as a result, his personality developed a lot differently.]]
* If [[spoiler:Evolt truly dug deeper into Soichi's mind to find thirty real weapons, what are the chances he would've found one of the worst and destructive weapons humanity made, the nuclear bomb, and made a Fullbottle out of that? Soichi specifically, and Earth as a whole, were lucky Evolt decided to accept the answers Soichi gave him or there might've been a Nuclear Bomb Fullbottle.]]
* [[spoiler:Killbus is strong enough that he doesn't need an Evol Driver to beat down Evolt, instead he goes with the 'knock-off' Build Driver, which is weaker than the Evol Driver.]] aren’t we all glad he didn’t try the Evol Driver!? cause if did it would been much worse for everybody.
* [[spoiler:The ending of the V-Cinema: Evolt basically leaves the Earth but it leaves the implication he might be eating planets again...[[SubvertedTrope thankfully he’s honored his promise to leave Earth]] but still leaves the implications...]]
* [[spoiler:Evolt himself sparks some in-universe horror with the first four Lost Bottles. The Cobra, Bat, Scissors and Zebra Lost Bottles were created by creating Lost Smash such as who the Scissors Lost Smash was. Who were used to create Cobra, Bat and Zebra though? ''And what happened to them?'']]
** [[spoiler:New World: Grease answers who Zebra was. Keiji Uraga, aka Metal Build.]]

** The Final Forms for all Riders (Genius, Cross-Z Magma, Cross-Z Evil, Grease Blizzard, Grease Perfect, Prime Rogue) with the Build Driver are either Real Grade (RG) or Perfect Grade (PG), as they are the best of the best when it comes to quality, detail and durability, so their power far exceeds that of a Master Grade-tier kit, but they also require a high skill level and dedication, not to mention the exorbitant cost of building one (Genius requires all 60 Fullbottles, while all the others require a special, AceCustom gimmick and/or adapter for the Build Driver corresponding to them) and limited availability, because only a select few Kamen Riders can reach a Hazard Level which breaks their limits, like how Perfect Grade is mainly for those who can truly afford it.

** The base forms of Build and Cross-Z are mostly Entry Grade (EG) or High Grade (HG)s. These kits are essentially the best starting point for beginners and is accessible regardless of skill, experience and availability, but have the least amount of detail and adequate articulation, so it makes sense why they would have the least power.
** The Hazard, Rabbit-Rabbit and Tank-Tank forms for Build embody Master Grade (MG) or Real Grade (RG), kits that are a step up in detail, durability, articulation and complexity, but they require a bit more effort and time by needing to build an internal frame for it. What are both super forms' internal frame, then? Hazard Form.
** The Final Forms for all Riders (Genius, Cross-Z Magma, Cross-Z Evil, Grease Blizzard, Grease Perfect, Prime Rogue) with the Build Driver are either Real Grade (RG) or Perfect Grade (PG), as they are the best of the best when it comes to quality, detail and durability, so their power far exceeds that of a Master Grade-tier kit, but they also require a high skill level and dedication, not to mention the exorbitant cost of building one (Genius requires all 60 Fullbottles, while all the others require a special, AceCustom gimmick and/or adapter for the Build Driver corresponding to them).

* "Kiryu" may have been a random name that Soichi/ [[spoiler:Evolt]] randomly chosen until you realise what pronouncing them sounds like. The "Ki" is similar to the word "Key" while "Ryu" basically means "Dragon", now which one of the Best Matches has both of them?

** The base forms of Build and Cross-Z are mostly Entry Grade (EG) or High Grade (HG)s. These kits are essentially the best starting point for beginners and is accessible regardless of skill, experience and availability, so it makes sense why they would have the least power.
** The Hazard, Rabbit-Rabbit and Tank-Tank forms for Build embody Master Grade (MG), kits that are a step up in both power and complexity, but they require a bit more thought and durability by needing to build an internal frame for it. What are both forms' internal frame, then? Hazard Form.
** The Final Forms for all Riders (Genius, Cross-Z Magma, Cross-Z Evil, Grease Blizzard, Grease Perfect, Prime Rogue) with the Build Driver are either Real Grade (RG) or Perfect Grade (PG), as they are the best of the best when it comes to quality, detail and durability, so their power far exceeds that of Master Grade, but they also require a high skill level and dedication, not to mention the exorbitant cost of building one (Genius requires all 60 Fullbottles, while all the others require a special, AceCustom gimmick and/or adapter for the Build Driver corresponding to them).

** The Final Forms for all Riders (Genius, Cross-Z Magma, Cross-Z Evil, Grease Blizzard, Grease Perfect, Prime Rogue) with the Build Driver are either Real Grade (RG) or Perfect Grade (PG), as they are the best of the best when it comes to quality, detail and durability, so their power far exceeds that of Master Grade, but they also require a high skill level and dedication, not to mention the exorbitant cost of building one(Genius requires all 60 Fullbottles, while all the others require a special, AceCustom gimmick and/or adapter for the Build Driver corresponding to them).

** The Final Forms for all Riders (Genius, Cross-Z Magma, Cross-Z Evil, Grease Blizzard, Grease Perfect, Prime Rogue) with the Build Driver are either Real Grade (RG) or Perfect Grade (PG), as they are the best of the best when it comes to quality, detail and durability, so their power far exceeds that of Master Grade, but they also require a high skill level and dedication, not to mention the exorbitant cost of building one(Genius requires all 60 Fullbottles, while all the others require a special, AceCustom gimmick for the Build Driver corresponding to them).

** Also, one of Build’s main themes is [[WarIsHell war and its effects on people]]. Now, with the {{Franchise/Gundam Gunpla runners}}, what was its origin series’ [[AnAesop Aesop]] again?