[[WMG: Tatanga will be the BigBad.]]

* Jossed, sadly.

[[WMG: The final boss will be an EvilKnockoff of Mario.]]
Past final bosses of the series: [[VideoGame/PaperMario a nigh-invincible star-powered Bowser]], [[VideoGame/PaperMarioTheThousandYearDoor Princess Peach possessed by an evil demon queen]], and [[VideoGame/SuperPaperMario an unholy fusion of Luigi and the BigBad]]. Now look back at ''Super Paper Mario'': who are the heroes of the Light Prognosticus? The red-clad mustachioed plumber is next on the list.

Obviously, Mario can't fight himself, so Bowser will probably use magic to create a clone that can make him meet his match (Metal Mario, maybe?).
** Jossed. Bowser is the FinalBoss again.

[[WMG: To make up for not having partners this time around, characters from previous games will have cameos]]
And if there's an arena level, at one point Troopa Jr., Lord Crump, and O'Chunks will team up against Mario 3-on-1.
** Jossed due to ExecutiveMeddling. Parakarry and Goombella are mentioned and Rawk Hawk is given a small nod, but no one appears.

[[WMG:There is a reason Bowser has no dialogue...]]
Chances are the crown he is wearing doesn't allow him to speak, which comes at the cost of reviving him as [[spoiler:giant cardboard version of himself.]] The Royal Stickers drove their wearers to madness, Bowser's crown made him an EmptyShell.
* Nope. Bowser doesn't speak in the ending, when he's in full control.

[[WMG:Sticker Star is an in-universe children's storybook.]]
It certainly explains the inconsistancies with the rest of the series and why everyone is apparently actually made of paper.
** On the other hand, LiteraryAgentHypothesis could also apply here, meaning that the story[[note]]In which the entire world turned into paper and cardboard[[/note]] did in fact, happen, but is told in the form of the aforementioned storybook.
** Partially confirmed. The Paper Mario world exists in a book, according to ''VideoGame/MarioAndLuigiPaperJam'', though it seems to be a one-of-a-kind magic book. No telling whether or not the Paper Mario adventures actually happened in some capacity in the normal Mario universe, though it's possible as the Star Spirits show up in ''VideoGame/MarioParty5''.

[[WMG: In the event future Paper Mario games continue down the "main games/Mario's world-only" criteria for characters, characters from newer games will appear.]]
For sake of example...
* [[VideoGame/NewSuperMarioBros1 Dry Bowser]]
* [[VideoGame/SuperMarioGalaxy Rosalina and the Lumas, plus assorted baddies and bosses]]
* [[VideoGame/SuperMario3DLand Pom Pom and assorted baddies]]
* [[VideoGame/NewSuperMarioBrosU Nabbit]]
* [[VideoGame/SuperMario3DWorld Motley Boss Blob]]

[[WMG: The sticker system was [[TheyPlottedAPerfectlyGoodWaste purposely designed to be frustrating]] to be a TakeThat to {{Microtransactions}}.]]
"You want to play the game normally? '''GIVE US ALL YOUR MONEY FOR USELESS, LOW DAMAGE ITEMS THAT CAN ONLY BE USED ONCE!'''"

[[WMG: The Royal Stickers and Kersti are actually villains/malicious in nature.]]
For artifacts said to grant wishes, they shouldn't be driving their wearers crazy/mute at all. The only reason they would change the personality of their wearer would be if they were control devices.

Continuing on, notice how whenever Kersti is inconvenienced by anything, she never worries. Angry? Yes, she does get angry. But never does she worry. Why? Because she secretly controls the strings of the Royal Stickers' victims, and could probably call them off, or even order them to take care of the problem, if she made a real effort to exert control. That time [[spoiler:Petey ate her]]? [[Main/ManipulativeBastard She was in control all along.]] When [[spoiler: Bowser]] didn't listen to her, she wasn't actually trying to call him off or exerting any power. [[spoiler: And what was used to defeat Megasparkle Bowser in the end? Not the combined power of the five Royal Stickers gathered so far...just Kersti.]]

To put it simply, helping Kersti [[spoiler: and reviving her]] [[Main/NiceJobBreakingItHero was probably the worst thing Mario could have done...]]

[[WMG: If a future Paper Mario game addresses Sticker Star, it will imply a more detailed version of the game happened.]]
For example, a completely new character who was never in Sticker Star [[Main/RemembertheNewGuy shows up and reminisces with Mario about their adventure in the Yoshi Sphinx]]. The first partner is puzzled at this claim before remembering the events in the Decal Lands were not as adequately reported as Mario's other adventures.
Also, any single member only characters will get [[DivergentCharacterEvolution redesigns and actual names]].