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WMG / Kamen Rider Den-O

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Owner is old Guy Shishioh after the events of the GaoGaiGar FINAL and Project Z, after defeating all possible threats to the universe in the present but losing Mikoto in the process.
Guy is contacted by The POWER and offered a new role — Guardian of Time. Being the hero he is, he accepts that role and receives the train of time, the DenLiner. By the time of Kamen Rider Den-O, Guy has already spent countless years or ages as the owner of the DenLiner and became bold and a bit eccentric. He usually hides his evoluder powers, but from time to time he manifests them in various displays of AWESOME — like when he does his old morning jog alongside the DenLiner going at cruise speed, or when he instantly knocks out the angry mob Ryuotaros caused, or when he powers the train with nothing but a custom bicycle.

Alternatively, the GGG timeline is destroyed by Imagins. Nothing else needs to change.

Airi and Sakurai are distant cousins
In the third movie, in the past the protagonists see two of Ryotaro's ancestors meet each other. One of them looks like Airi, the other one looks like Sakurai-san.

Alternatively, the protagonists were mistaken about the relationship between those two.
Airi and Sakurai's ancestors never became more then Just Friends. The reason they were being targeted by the villain wasn't because they were Ryotaro's ancestors (Sakurai wasn't), but because they were Hana's ancestors.

The Imagin haven't actually been eradicated altogether.
This is why they keep showing up after the finale. Kai was just a ruse to distract the Den-O crew. If anything, he was working for an even Greater-Scope Villain. And it's very likely this Bigger Bad is a Cow Kaijin.

Den-O's two Super Modes are emblematic of the series' direction.
Climax Form represents the show as a goofy comedy focusing on the Taros; Liner Form represents Ryotaro's Character Development and growth from Chew Toy to real hero. Since the Taros' antics seem to be a license to print money, and Takeru Satoh has left Den-O for other acting projects, we can expect Climax Form to show up more and more, while Liner Form's swan song was Final Countdown.
  • More evidence for this theory comes via Kamen Rider Decade: Decade's Complete Form has the power to summon duplicates of the other Riders in their own Super Modes. During the series, the Den-O button makes a Liner Form dupe, but in the Final Chapter movie it's switched over to Super Climax Form (just as Kuuga's Super Mode switches from Ultimate to Rising Ultimate).
    • Fridge Brilliance may nullify this, when one remembers that the Den-O Liner Form seen in the Shinkenger crossover was a mindless puppet duplicate, specifically created by the K-Touch; where as the Super Climax Den-O in Final Chapter was actually Momotaros. What one must keep in mind is that Liner Form was made specifically because the Imagin couldn't be used. They were, however, available for the battle in Final Chapter, so the Super Mode changed to accomodate.

The events of Climax Deka are masterminded by Dai-Shocker.
Given that Fangires aren't supposed to exist in Den-O, it was assumed that some of the Fangires were Dai-Shocker agents. This also explains how Wataru, Shizuka, and even Otoya got there.
  • Which means... to quote Narutaki: "It's Decade's fault."
  • Which also might mean that the Neo-Fangire menace at Kamen Rider Kiva's ending are Dai Shocker Fangires.
  • And this might mean that Ryotaro and Wataru already knew of Tsukasa's nature even before Kamen Rider Decade series started.
    • Well, we already knew this to be the case with Wataru.

The fact that Ryotaro is a Singularity Point means it's physically impossible for an AR Den-O to exist.
Basically, the same ability that makes Ryotaro more or less immune to temporal paradoxes also prevents alternate Ryotaros from cropping up in other universes. This is why Decade went to the actual Den-O universe, rather than the World of Den-O; there is only one Den-O in the entire multiverse even if he doesn't always look like the same person.
  • Pretty much confirmed (in broad strokes) in the Cho Den-O Trilogy

The Denliner's different appearences in the show and in Decade are desktop themes
Just like the TARDIS.

The Oni Brothers are (or were) members of Great Shocker.
How else would they have mooks from a different series?

Deneb and Teddy will be added to Climax Form in the next movie.
Scans have been released of Hyper Climax Form, with Deneb's head on one of the knees. Following this example, Teddy will eventually be added to the other knee, completing the look, and turning Climax Form into Kamen Rider's first ever cluster-fuck Super Mode.
  • That image was a joke, made by the staff during the series' run; they also doctored images of a DenKamen Sword with Sieg's mask added, and a "Zero Vega" Form. Besides, giving control of the knees to other Imagin would render Ryutaros pretty well useless, since he's the one in charge of the legs in Climax Form as is.

Why do Imagin keep appearing even after Kai was defeated?
Shiro/Yuki did it.

Sakurai Yuto is the protagonist of an earlier Kamen Rider series that was erased from the timeline.
Once, there was Kamen Rider Zeronos, or '0-nos', a pun on Chronos. It was dark and gritty the way Den-O was light-hearted and campy. It involved the battles preserving Hana's future, and its climax was in its destruction. Just as (younger) Sakurai Yuto got his Zeronos transformation belt and cards from the (older) Sakurai Yuto, so did that Sakurai Yuto mysteriously get his Kamen Rider form from further down the timeline. The entirety of Den-O is actually part of the concluding movie of that series- that's why Momotaros is always at climax from beginning to the end, because that's the spot he occupies in the plot. It's a father's tale and the hardest part is knowing when to let your daughter's fate go separate from your own. Jaded and tired, the arc words "the past should give us hope" means trusting the task to even earlier and more idealistic versions of themselves. The disappearance of (older) Sakurai and the establishment of his younger self as a separate timeline is the typical bittersweet oldschool ending.
  • Kai is the progeny/protege of the Big Bad from that timeline, and his control over Imagin was engineered into him. His own related arc words are about how he was shoved into the timestream as a final gesture of spite by whoever turned him into a tykebomb. In many ways, he too is extremely idealistic in trying to get a better world.

All Singularity Points can create and control Imagin.
That's where they actually come from, and why the Imagin associated with Den-O didn't disappear in the end. They are the footsoldiers of a Time War, and somewhere 'down the line', there are rules of noninterference where Singularity Points are involved. Ryutaro is just unaware or in denial that he could ever be as bad as Kai.

If Den-O were adapted into English he would be called Trainlord
Self explanatory

Den-O Liner Form can't be utilized while Ryoutarou is stuck in his younger state.
It certainly makes sense. Theoretically, Ryoutarou should be able to transform into Liner Form regardless of whether he's in contact with the Taros or not; he just can't use the Den-Kamen Sword's abilities without them. Despite this, he hasn't used Liner Form once since Final Countdown, even when it should be necessary (such as when he is unable to contact the Taros during the events of Episode Red). Incidentally, Final Countdown is not only the last official appearance of the Liner Form, but it was also Satou Takeru's last stint as Ryoutarou, after which Mizoguchi Takuya takes over as Ryoutarou's younger form. In other words, the only one who can transform into Liner Form is the older Ryoutarou.
  • It makes sense. He complained about how heavy the Den-Kamen Sword was in-series, before the time warp. Obviously, in a younger state, he can't lift it at all.

Both the older and younger Ryoutarous will appear at the same time in a future installment and fight against Den-O's ultimate threat
The younger Ryoutarou will transform into Den-O Cho-Climax Form while the older one will transform into Den-O Liner Form and fight together at the same time.

Takeru Satoh will reprise his role as Ryotaro in the Let's Go All Riders movie
That's why we haven't seen the younger Ryotaro in the previews. They want to keep the surprise and also this movie looks like its bringing back the old actors so this just has to happen.
  • Jossed, sadly. Ryotaro didn't even appear - Momotaros was the one who transformed into Den-O, and Kotaro/New Den-O for all intents and purposes is the Den-O featured in the film.

Den-Liner is a TARDIS and The Owner is a Time Lord
... Do I really need to elaborate? It's pretty freakin' obvious.

Den-Liner, Zero-Liner and all the other time trains were built by Doc Brown
See the end of Part III.

Den-O will actually stop getting/starring in movies one of these years.
  • Because this page wasn't crazy enough already.
    • Well, he's not in Movie Wars Megamax for one.
    • I'd say "Taking a break" is more accurate, since he's only been in the Super Hero Taisen movies, and he didn't make any appearances in any movie involving Kamen Rider Ghost. Although rumors about Chou Super Hero Taisen say that Momotaros is going to be narrating the film...
    • They've stopped making movies with Den-O as the main star, but as long as they keep making Super Hero Taisen movies, they'll keep Den-o in them. It seems that his role depends on the movie in question - GP 3: Kamen Rider 3 featured him in a rather minor role, while Chou Super Hero Taisen featured him as a major character.

Owner and Station Master aren't human. Kai isn't either.
This one should be pretty obvious, since Owner has demonstrated more than a few supernatural abilities and only seems to eat for the sake of the flag 'game' instead of taking any kind of sustenance from it. The Station Master, who seems to be identical to Owner (but that's just your imagination) is most likely the same way.

However, Kai also uses some odd powers that no other human in Den-O has, like mind control, seeing into other peoples' memories, and creating portals to the past using his own body. Thus, he might be one of whatever Owner/Station Master are. He also just laughed when one character asked if he was human, so there's that.

The plot of Den-O is the climax of a long cycle of destruction and recreation.
The Imagin are trying to destabilize the human-controlled timestream in order to bring about a future where they truly exist. That much is stated in the show. But what the show doesn't tell you is that the Imagin attack is only the most recent battle in an ancient war spanning eons.

Humanity controls the timeline because we overwrote the Imagin timeline with our own, exactly like what the Imagin are trying do. But before that, Imagin won control over the timeline by overwriting the human-controlled timeline. And before that, humanity won control over the timeline by overwriting the Imagin-controlled timeline, and so on and so forth.

When humans control the timeline, the Imagin are reduced to the sands of time, and must barter with humans in order to obtain physical forms. When Imagin control the timeline, the same is true for humans, only humans harness the power of the Imagin via the Rider System because we lack the same natural weaponry.

Overseeing the war are certain enigmatic figures who appear human but are decidedly something else. We know them as Kai, Owner, and Station Master. They represent different sides in the war: the reckless and childish Kai commands the Imagin directly, the eccentric Owner subtly influences the Riders who defend humanity, and the mysterious Station Master, who takes no sides but leans in favor of humanity. Neither humans nor Imagin realize who they truly are. They naturally exist within the desert of time, and either built or influenced the building of the time trains so prevalent in the series. They don't actually need the trains to travel through time, as Kai makes obvious. Rather, the trains are necessary to transport the timeline's defenders, whether human or Imagin.

Den-O is the climax and end of the war. With only a few Imagin left in existence (and most of those are friendly to humans), they no longer pose a threat to humanity's future. And aboard the King Liner, over a platter of fried rice, Owner smiles because his plan—the extermination of Kai and the Imagin—has finally come to fruition.

Urataros is Koutaro's grandfather.
While in Ryoutaro's body, Urataros had sex with a girl and got her pregnant. It's far more likely than Ryoutaro himself getting laid.

Kai was the key to the Junction Point that would had led to the Imagin's future