History Headscratchers / KamenRiderBuild

** It's implied the Skywall might have been the [[ForWantOfANail nail]], as the BigBad duo of the movie are the same guy from the main timeline and his counterpart in the World of Build, meaning some previous Riders ''might'' exist in Build's world, at least up to 10 years ago.

** [[spoiler:#34 showed that Katsuragi did have the Gorilla [=FullBottle=] before, but because of Evolto it's essence faded and he is forced to recreate it as Sento and the Best Match sound is just for merchandise reasons.]]

* Do they ever explain where did Evolto got his bottles from?

* If Sento's Build Driver is the basis for the Rider System of the series, why is he the only one who uses mix-and-match style forms while everyone else only ever uses one Bottle/Jelly at a time? It's been noted in-show that the versatility of Sento's method grants him a great advantage over the other Riders and Rider-like characters and it allows him to make use of the Best Match system that the Full Bottles seem to operate under for additional power. [[spoiler:Evolto doesn't really count as his forms are all an organic bottle mixed with the Rider System itself as an enhancement.]]

* Looking back at scenes with Soichi, when was he in control and when was Evolto in control?
** He probably never truly was in control and Evolto was only pretending to be Soichi by emulating his personality and emotions. If Soichi did have control, he would probably immediately tell everyone everything he knows about Evolto.

* How did Nariaki survive his gunshot wound from episode 12? And why is he so out of character in all appearances after that. The show doesn't properly explain this, oh it tries to make us think it explained it, with that whole Gentoku killed Nariaki's dreams, which is just nonsensical, and doesn't explain anything. Also how can he use the spare Evol Driver if he's only human, and not also a part of Evolto?

### Rewatch the scene where he first dons the Driver, he's suddenly infused with Evolto's cells and Nebula Gas to allow him to use it, as well as to increase his Hazard Level. (And probably setting up the whole body double thing, but that's irrelevant to your question.)

*** It's also possible that Evolto wouldn't have allowed them to fly. It would've interrupted his 'game', after all. He likely would've devoured another portion of Japan the second one of them took off, as retaliation for breaking the 'rules'. Although why Gentoku didn't just warp them to the top with the Nebula Steam Gun is beyond me.

** The black panel was created when Evolto placed the Black Hole Trigger in the Pandora Box, but he didn't lose it now did he? So why would they lose the Hazard Trigger when creating the white panel?

** According to New World: Cross-Z, the others are actually professional voice actors. As for Evolto, who doesn't have a counterpart, an actor named Tetsuo Kanao (Evolto's RealLife voice actor, naturally) nailed the role uncannily well.

* So the Last battle for Sento against Evolto has him going the upgrades he had. From Rabbit-Rabbit, Tank-Tank, then he goes down to Rabbit Tank Sparkling then to just Regular Rabbit Tank. How exactly did that work? Cause I know that maybe the Full-Full Bottles has the essence of Rabbit-Tank but how did he exactly did he downgrade to Sparkling then eventually the Regular Best Match?

** That seems to be the implication - after all, consider that prior to episode 2, Sento didn't really know about Kasumi, and it's entirely possible that Ryuuga isn't familiar with her handwriting.

** [[spoiler:#34 showed that Katsuragi did have the Gorilla [=FullBottle=] before, but because of Evolt it's essence faded and he is forced to recreate it as Sento and the Best Match sound is just for merchandise reasons.]]

** Because it was intended for [[spoiler: creating Last Pandora Panel White]], so he kept it.

*** It might also be a reference to how [[spoiler: Gentoku's mind has become ''fragile'' due to his torture. They put that on as a subtle indication of his insanity.]]

* But seriously, shouldn't Sento has been suspicious that a random samaritan cafe owner just so happens to have weapons that can combat Smash and a daughter that can purify the Smash's power? Also, why the heck did Misora kept her [[spoiler: vision of Mars' destruction]] a secret all these times?

* Do they ever explain where did Evolt got his bottles from?

* If Sento's Build Driver is the basis for the Rider System of the series, why is he the only one who uses mix-and-match style forms while everyone else only ever uses one Bottle/Jelly at a time? It's been noted in-show that the versatility of Sento's method grants him a great advantage over the other Riders and Rider-like characters and it allows him to make use of the Best Match system that the Full Bottles seem to operate under for additional power. [[spoiler: Evolt doesn't really count as his forms are all an organic bottle mixed with the Rider System itself as an enhancement.]]

* Looking back at scenes with Soichi, when was he in control and when was Evolt in control?
** He probably never truly was in control and Evolt was only pretending to be Soichi by emulating his personality and emotions. If Soichi did have control, he would probably immediately tell everyone everything he knows about Evolt.

* How did Nariaki survive his gunshot wound from episode 12? And why is he so out of character in all appearances after that. The show doesn't properly explain this, oh it tries to make us think it explained it, with that whole Gentoku killed Nariaki's dreams, which is just nonsensical, and doesn't explain anything. Also how can he use the spare Evol Driver if he's only human, and not also a part of Evolt?

### As a Nanba Child, he likely had some form of tracker on him that allowed them to find him in time.

### Rewatch the scene where he first dons the Driver, he's suddenly infused with Evolt's cells and Nebula Gas to allow him to use it, as well as to increase his Hazard Level. (And probably setting up the whole body double thing, but that's irrelevant to your question.)
** It's finally given screen time in episode 47, when it's revealed that [[spoiler: Nariaki Utsumi is rebuilt as a cyborg.]]

*** It's also possible that Evolt wouldn't have allowed them to fly. It would've interrupted his 'game', after all. He likely would've devoured another portion of Japan the second one of them took off, as retaliation for breaking the 'rules'. Although why Gentoku didn't just warp them to the top with the Nebula Steam Gun is beyond me.

* So here's something I noticed during Episode 48. [[spoiler: When they were merging the two worlds together, Sento went from his Genius Form down to his [=TankTank=] form. Now I can understand losing the Genius form because the [=FullBottle=] to make it used a Pandora Box panel, but I thought that since the Hazard Trigger was used in creating the white panel, it would be lost forever during the merging process. What happened?]]
** The black panel was created when Evolt placed the Black Hole Trigger in the Pandora Box, but he didn't lose it now did he? So why would they lose the Hazard Trigger when creating the white panel?

** According to New World: Cross-z, the others are actually professional voice actors. As for Evolt, who doesn't have a counterpart, an actor named Tetsuo Kanao (Evolt's RealLife voice actor, naturally) nailed the role uncannily well.

* So the Last battle for Sento against Evolt has him going the upgrades he had. From Rabbit-Rabbit, Tank-Tank, then he goes down to Rabbit Tank Sparkling then to just Regular Rabbit Tank. How exactly did that work? Cause I know that maybe the Full-Full Bottles has the essence of Rabbit-Tank but how did he exactly did he downgrade to Sparkling then eventually the Regular Best Match?

* How did new world's Kazumi and Gentoku regain the ability to henshin without Nebula Gas injection? How did they get their gears in the new world?

** [[spoiler: It could be that Katsuragi's plan was to kill Stalk and Ryuga first, ''then'' destroy the Hazard Trigger - after all, Ryuga didn't have any powers to speak of when he showed up on the scene, and since Stalk had the Hazard Trigger, it could be that Katsuragi was going to use his regular form to kill Ryuga, and the Hazard Trigger was his back-up against Stalk - he just didn't anticipate Stalk having the ability to remove the essence from his bottles...]]

*** Remember that until the bottle purifier was up and running, Mishra could only do one every so often. It might be that it took him a while to get it running and Souchi was content to wait.

** According to New World: Cross-z, the others are actually professional voice actors.

* How did new world's Kazumi and Gentoku regain the ability to henshin without Nebula Gas injection? How did they their gears in the new world?

** Considering that a version of Taro Satou exists, it's likely that Takumi Katsuragi has a version of him running around in the new world.

** Build has been confirmed an AR World via a description from Heisei Generations Final.

** [[spoiler:#34 showed that Katsuragi did have the Gorilla [=FullBottle=] before, but because of Evolt it's essence faded en he is forced to recreate it as Sento and the Best Match sound is just for merchandise reasons.]]

** Plot reason: To simultaneously give Ryuga his ability to henshin back, and to give him a much needed upgrade to his base powers. He had to be weaker then Grease at this point. Meta reason: To quote Spaceballs, Merchandising!
*** It was also stated that Cross-Z Magma gave Ryuga discomfort, because of the amount of heat that the form is emitting. This new form is probably just used so that Ryuga doesn't consume to much energy and fight for longer periods of time.

* So um. is there not a version of Takumi Katsurgi in the new world like there is another version of Ryuga running around? Or did Sento literally took his place in the new world also?

* So the Last battle for Sento against Evolto has him going the upgrades he had. From Rabbit-Rabbit, Tank-Tank, then he goes down to Rabbit Tank Sparkling then to just Regular Rabbit Tank. How exactly did that work? Cause I know that maybe the Full-Full Bottles has the essence of Rabbit-Tank but how did he exactly did he downgrade to Sparkling then eventually the Regular Best Match?

* So um. is there not a version of Takumi Katsurgi in the new world like there is another version of Ryuga running around? Or did Sento literally took his place in the new world also?

* So um. is there not a version of Takumi Katsurgi in the new world? Or did Sento literally took his place in the new world also?

* So the Last battle for Sento against Evolto has him going the upgrades he had. From Rabbit-Rabbit, Tank-Tank, then he goes down to Rabbit Tank Sparkling then to just Regular Rabbit Tank. How exactly did that work? Cause I know that maybe the Full-Full Bottles has the essence of Rabbit-Tank but how did he exactly did he downgrade to Sparkling then eventually the Regular Best Match?

* So the Last battle for Sento against has him going the upgrades he had. From Rabbit-Rabbit, Tank-Tank, then he goes down to Rabbit Tank Sparkling then to just Regular Rabbit Tank. How exactly did that work? Cause I know that maybe the Full-Full Bottles has the essence of Rabbit-Tank but how did he exactly did he downgrade to Sparkling then eventually the Regular Best Match?

### Remember Eiji from OOO? When someone experiences either A) severe trauma, or B) great suffering, they can indeed lose a part of themselves. He had a brief window that he could escape his life, and Gentoku took it away. That was the trigger. However unlike our underwear loving hero, the experience didn't improve him, instead doing the opposite.

** It's finally given screen time in episode 47, when it's revealed that [[spoiler:Nariaki Utsumi is rebuilt as a cyborg.]]

* That one scene when Sento and Ryuga was climbing up the stairs in #47: Why were they temporally in their rider forms, and while they're at it, why didn't they take the opportunity to use their powers to skip several floors ahead?

** It's possible that the others do remember the old world later, maybe through Sento's journal jogging their memories (perhaps Misora's deja vu was actually remembering Sento rather than mistaking him for Satou) or something happens in a future crossover to restore their memories. Or, alternatively, Sento gets the journal made into a TV show and somehow gets the others to voice their "characters".