Naruto/WMG/Confirmed

=== These are Wild Mass Guesses for the series Naruto which have been confirmed by the series or by Word of God. If a WMG on one of the open pages is confirmed, please move it here. ===

Please add new confirmed entries to the bottom of the page.

Tonton is a Summon Beast
Most summon beasts talk, and Tonton's oinking sounds an awful lot like someone saying, "Oink". She's also able to fly, something that no other non-Summon Beast of a species that normally doesn't can do.
 * The first-run Volume 8 Uncut DVD includes a gashopon officially labeled "Summon: Tonton"

Madara lost his fights with the First and Fourth Hokages as a result of losing control of the fox
It's said that the First Hokage is able to control the nine-tailed Fox to an even greater degree than Yamato can, so it's likely that Madara wasn't prepared for this. When the Fox shifted sides, so too did the balance of power between Madara and the First Hokage, and he was unable to fight off the two. In the fight with the Fourth Hokage, he might have been strong enough to take on most of the ninjas, but he had to retreat because he lost his means of destroying the village, similar to how Orochimaru managed to kill the Third Hokage, but with his arms sealed, couldn't destroy the village. It seems more plausible than the Big Bad having been weak enough to lose to two previous Hokages.
 * Confirmed for the Fourth Hokage; Madara admits he's impressed Minato injured him, and retreats after he no longer has control of the fox, promising to bring it under his control again someday.

Even if Madara, Zetsu and Kisame deign to help out, I just can't see this going well for Hebi. Seems like it'd have to be a real Ass Pull otherwise.
 * Seriously. I'm looking forward to seeing how Sasuke reacts when he finds out that that secret Weapon of Mass Destruction that he's planning to wipe out Konoha with? Kakashi's got it too. Alternate dimension porthole trumps black fire - especially when considering the Convection, Schmonvection trope that this series loves to wave around.
 * Wait, Sasuke's still planning on destroying Konoha? Being Akatsuki members aside, I thought the Power of Teamwork made him change his mind (he's already changed team name from "Snake" to "Hawk"), unless all those flashbacks of him talking to Madara were flashforwards (or plans)
 * He changed the name to reflect the change in purpose, although it's possible he may have second thoughts at some point, especially since he remembers the Team 7 picture during his flashback, and specifically assumes out loud that the Akatsuki haven't captured Naruto, which could indicate that he still doesn't want Naruto to get caught.
 * So he's gone from "Kill Itachi" to "destroy Konoha" to "kill Danzo" to "destroy Konoha; Danzo's just a bonus!" Goddamnit, in the latest chapter he's officially Pain 2.0. At least he's finally settled on a personality (or has he?).
 * The wild mass guess was pretty much confirmed by the Five Kages arc. Team Hawk got slaughtered, and even Sasuke got his ass handed to him. He'll probably level up for the future, but for now, Take That Scrappy!
 * Not to mention that

Haku will return.

 * Or rather a Haku puppet will return because of the Rinnengan.
 * Not quite, Haku is the sixth body in the coffins. Because.
 * Confirmed. It's not the Rinnengan, and it's probably not the sixth body, but Haku IS raised by Kabuto. Congratulations on a really good guess!

Danzo traded with Orochimaru: expertise to assist in injecting Senju DNA (to Danzo) for knowledge of the Impure World Resurrection technique (to Orochimaru).

 * This is also canon. Well, maybe not the second part, but the first part is.

Madara either put a Rinnegan in as his new left eye, or replaced his left eye with a new Sharingan and implanted a Rinnegan into his forehead.

 * Confirmed. The first part, anyway.

The other Jinchuriki who've had their demons sealed by Akatsuki will be returned to life.
This is more plausible with the events of 449, and makes the splash page of them on that one cover less pointless. Also, it'll give Naruto some plausible rivals in power by the end of the Akatsuki arc, other than Bee and the Kages.
 * The Jinchuriki were all revived by Edo Tensei, but from the looks of it, they're just the mindless zombie types.

Naruto is a descendant of the Senju Clan
Naruto's father Minato Namikaze was a descendant of the Senju clan and passed his bloodline to Naruto. This is hinted at Naruto and Sasuke's battle at "The Valley of the End". Madara Uchiha stated here that history will repeat itself, which probably means Naruto who is a Senju and Sasuke who is a Uchiha will one day fight like how Madara and the first Hokage fought.
 * At this point it sort of seems that everyone in the Leaf Village except the Uchiha are descendant from the Senju clan (unless they allowed immigration at some point).
 * People keep saying that (especially on this wiki) but that doesn't seem to be the implication. There were obviously other clans in the Fire Country at the time of Konoha's founding, and they would no doubt have seen the advantage in joining with the Senju and Uchiha. Furthermore, civilians (especially merchants) would see an oppurtunity for work in the village and I doubt the First Hokage would have prohibited them from moving in. In fact, there would be a distinct advantage to allowing members of civilian families to become shinobi since their only loyalty would be the village, not their clan.
 * Yeah, no matter how many members the Senju had or if they all married into different clans, a little over 80 years is not long enough for them to have intermarried with everyone.
 * http://mangastream.com/read/naruto/87110441/4 Page 4 of chapter 500. I think that about wraps that up.
 * To be exact, the Senju and Uzumaki clans simply share a common ancestor. Naruto is related to the Senju, but not descended from them.
 * It has to be noted, however, that even though he is not descendant from Senju but rather from their ancestor, it's the relation to said ancestor that is important. He is, just like them, a descendant of the younger son of Sage of the Six Paths.

Naruto has whiskers because he was conceived by a jinchurki

 * Confirmed

Kabuto's Sixth Coffin contains Madara's Body.
Which is why Madara is so shocked to see it. He's technically dead, but because of his Eternal Sharingan, he's still in the world. His Intangibility Jutsu is actually reversed; he has to activate it in order to effect the world, rather than become intangible. This also explains why it's taken him nearly a hundred years to try for revenge. He spent most of that time figuring out how to be something more than a ghost.
 * But that's the exact opposite of how Impure World Resurrection works: it takes the real soul and makes a fake body that looks and works like the person being resurrected out of a living body. The only way it could be Madara's body is if the man in the mask is Madara's body (or used to be, given what he was doing in his lab a couple episodes ago) which is somehow living on and having a will despite not having its soul pass on.
 * Bah, we're basing what we know about how the technique works off of out-dated information from the only other time it showed up. Most of what's known to be 'true' about it has its roots in fanon, not canon. Besides, Naruto changes how things work all the time. I'm sticking with my guess.
 * It is not fanon, "taking the dead person's soul and putting it in the body of a living person which is then made to look like that of the dead person" is exactly how it's described to work in both the manga and the databooks, and the detail that the bodies ressurected by Kabuto are still in the "not fully formed" stage indicates it still works the same way.
 * That's operating under the assumption that Madara's soul is actually alive. As a guess above stated, Tobi could just be trolling and pretending to be Madara. We've never seen Tobi use the Mangekyou (which would be pretty solid proof that he's Madara), so we don't even know if he can, much less what it looks like. We've never seen enough of his face to know anything more than that he's got some nasty bags and the Sharingan. Tobi could be freaking out because Kabuto found out his secret (that he isn't actually Madara) and showed off his knowledge by summoning up the real Madara as blackmail. Could also explain the subtle snark Kabuto's got going on this page over Tobi's name.

The Shadow Duplication technique is incomplete
The extreme wimpiness of Naruto's shadow clones is entirely due to the fact he didn't get the remember the stolen scroll's technique correctly. Eventually, once he achieves his long-term leadership goal, he'll rediscover his predecessors' library, and learn the 'real' ultimate technique: Hokage Bunshin no Jutsu
 * Some translations call Kakashi's lightning clone a "Lightning Shadow Clone Jutsu," so it's possible that the "Hokage Bunshin no Jutsu" will create shadow clones made out of fire.
 * Its "Raiton Bushin", also most water style ninjas master "Mizu Bushin(no jutsu)". Naruto got the complete technic(Kage Bushin no jutsu). Its rather that each clones becomes more wimpy than the last. That likely means that something we already know:
 * Kage bushin is effective at a low number, and uses to much chakra to be effective in higher numbers, aka what we se in the series.
 * Mizu Bushin creates cheap clones, really cheap clones. So long there enough water nearby... They are also a lot weaker.
 * Raiton bushin no jutsu, i works and is powerful. The catch? Still pops on hit, and uses massive amounts of mana.
 * With this we can speculate that Doton is a solid clone, medicore cost but solid. And some major disadvantage?
 * Katon might work, but it will last a short time. But likely not doable.
 * I have an inkling there doesn't have to be a clone technique for every element. At the same time, let's not rule out bloodline limits! Haku recreated his own version with the ice mirrors where his real body became multiple bodies through instant reflection. But I don't think Sasuke can mix fire and lightning, sounds improbable.
 * Partially confirmed: It's not that the Shadow Clone technique is incomplete, Naruto simply couldn't use it well in the beggining. By now he fully mastered it, and it has become quite effective.

The multiple versions of the Rasengans in the movies actually make sense!
The Rasengan was incomplete because it lacked an infused affinity. While Naruto eventually succeded in adding his wind element to the technique and greatly increased its power, the reality is that the normal Rasengan can be infused with any secondary power source. The movies have Naruto do just that, thus explaining why the Rasengan is such a powerful and versatile technique.
 * There's also the Demon Fox Rasengan, which Naruto uses at the end of his fight with Sasuke, which was published in the manga at some point after the first movie came out, which is another case of it having an external power source. It's unclear whether it was planned before the first movie came out, though. The Guts Rasengan in the fifth movie, however, seems to be Naruto merely doing the Rasengan many times.
 * This isn't really a guess (Baring some of the odder versions that don't make sense for other reasons (IE: the Moon Rasengan)). The Rasengan is just Chakra with Shape manipulation. Theoretically Naruto can make one out of any source of Chakra that can be manipulated.

"Madara" is lying about his own identity.
Madara has revealed himself. So... why is he still wearing the mask? The only logical conclusions are either that it's the source of all his powers, which would be inconvient and rather stupid, or that he's hiding his true identity. For all we know, he could be Izuna, or Shisui, or Obito!
 * Or maybe it's because it makes him "more mysterious" and it's easier to draw.
 * Could be a fashion statement. He knows all about the power of spirals and orange.
 * Maybe he's Naruto from the alternate future, then? Naruto's name can be translated as "vortex", and he obviously likes orange. It would also explain why he wears mask, seeing as his facial markings would make him rather easy to recognise.
 * Or he could just be really disfigured (possibly from the fight at the Valley of the Ends) and just would rather people not see said disfigurement. In otherwords, he's vain, which is definitely in character for an Uchiha.
 * This theory has been confirmed by recent chapters. The real Madara died a long time ago.
 * Or not so long ago. We know that he survived his fight with the 1st Hokage and lived long enough to know who Nagato was, so it's ambiguous how long he's actually been dead. He may have died relatively recently.

Naruto will team up with the Kyuubi much like Killer Bee with the Hachibi to kill Madara
In a combination of various WMGs above, Naruto will get help from Killer Bee and either combine it with Sage mode and Itachi's gift to completely control the Kyuubi, or come to an agreement with the Kyuubi to defeat Uchiha Madara. Perhaps a combination. They both hate Madara more than anyone. Kyuubi would get controlled on his own. Naruto can't be directly controlled but can be put under a genjutsu with similar results. However, if Naruto learns how to stay sane while letting the Kyuubi's chakra out completely, and be in control of the Kyuubi as well, and the Kyuubi agrees to help him, well, Madara is pretty much doomed. Naruto would keep the technique that controls bijuu away from the Kyuubi, Kyuubi would disrupt any genjutsu placed on Naruto. Something to stop that space/time jutsu dodging and the mother of all Rasen Shurikens should do the rest.
 * sorta confirmed. Naruto and Killerbee have finally met for training.
 * Confirmed. It seems like they are officially partners now.

Alternately, Madara is dead, and Tobi stole his identity.
Have we seen any evidence that Tobi is Madara? Nobody has seen his face yet except Kisame, who also thinks he is/was a Mizukage; but for all we know, Tobi might have been using the same false identity during his time as Mizukage, too. Itachi is convinced that Tobi's Madara, but we don't know how he was persuaded. Minato thought he was Madara, but that might just have been him going "he's so badass, he must be Madara!" Tobi might just be using that name to get attention, and/or disguise his true intentions.

Sakura will confront and fight Sasuke
And A) drag him back, or B) follow through the Konoha 11 decisions and. Either way this would be pure awesome.
 * Regardless of her true intentions, it's likely that Naruto will think she's trying to do B) and hurry to save Sasuke.
 * Well, she tried anyway.

Karin is an Uzumaki.
She has red hair and Orochimaru was interested in her for some reason. Also, she has the ability to fully heal people by having them bite her, no matter how badly they are injured, while seeming to suffer no ill effects beyond having scars for every time she's been bitten. The ability to heal the mortally wounded without suffering any ill effects (and even enjoying it!) sounds like an ability a descendent of the Clan of Longevity would have.