I think he will meet the sage and Naruto's character would be changed. He would get a new powerup which outclasses the other and which is unique to him. I also think he will get the authentic staff of rikudo
Additional: Death has taken away his stupidity. He is now aware of reality. Through death, one's convictions and character can be changed. I am teaching you nothing. Try to imagine the situation.
Hope your right about the death thing lol, watching Naruto be stupid all the time is painful. I mean even Natsu from fairy tail has his serious moments. Naruto is just stupid all the time 24/7.
i think it will be a different take on juubi mode.. he would have about the same chakra as obito had with the bijuu but obito also had the gedo mazo turn the bijuu into the juubi (wich is WAY stronger chakra-wise because the proportions of chakra to nature energy are way different from naruto's senin mode)..
it will be some sort of advanced frog sage mode most likely ^.^
depending on how the nature energy to chakra will scale if you have all bijuu combined, he will/won't have less chakra, but it will most likely be a stronger, better quality chakra than madara or obito's juubi chakra mode.
basically his body would BE the juubi much like the gedo mazo is the juubi right now.. other than the other two who just sealed the juubi inside of themselves he wouldn't be lending power, he would be using it as if it was his own... i also bet there is a fair amount of chakra that obito and madara needed to use to keep the juubi/bijuu in tone, naruto won't have to do that... does that make it stronger? i don't know.. it will be interresting to find out though!
Interesting I like your take on it, instead of the Gedo Mazo Naruto would substitute his own body as the juubi's body. Now that could be cool. He would "become" a biju, not just a host.
Nope, SM works against Juubi Jin or only SM can damage Sage's transformation...
Combined, they will be much stronger... and Sasuke will just back up Naruto who will be actually dealing with Madara with his new transformation...
You forget its not Sage chakra that works against juubi jin, its the fact you have enhanced your own chakra with natural energy which takes it beyond conventional 5 nature type transformation. With Madara now having his own sage mode his own black stuff is now enhanced with sage charka IE that means the weakness of his form is now no longer a weakness.
Oh you mean this current powerup... yeah once naruto becomes a semi juubi jin. there's a high chance he'll be able to use the sage's sword
It's already been foreshadowed ever since obito mentioned it has the "sages feelings". whose the sage's successor?: naruto.
I don't see Naruto using a sword sorry, hes never used one before, and has shown no interest in them. Sasuke is more likely to be interested in such a thing. Not only that but a sword cannot be used to create, a kunai however as a gardening tool can be.
Something like Menma's ability to split the Kyuubi chakra into mask/entities would be cool,instead Naruto would split the chakra of each Bijuu they would be able to use their unique abilities(magma,poison etc).
This sounds interesting I like this, but realistically I have my doubts that Kishi would be so interesting

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He will gain an new cloak. He will gain the power to control nature itself. Similar to the juubi's tenpenchii. He will gain a unique ability which will be yin yang release but used differently from the black chakra that madara and obito have. Naruto in the end will gain an ability to take away a persons ability to use chakra permanently
This sounds really interesting I have to admit. Taking away Madara's chakra and rendering him just a normal person would be extremely satisfying, better than killing him lol.
So kudos to you for such a cool idea. Very similar to avatar I have to say lol.
Mmmm, all you said this new mode can do is go fast and have quick reflexes which he already has. Greater damage potential? Meh he can't tank Madara he needs more surgical like techniques. Spamming Bijudama's is not going to affect Madara lol.
And as for the Rinnegan sure we would like to see Naruto with it but realistically its not going to happen.
Naruto gets new white chakra cloak w/ SM that can create and tank multiple tbb
Sasuke gets Rinnengan, SM, and senjutsu PS
Madara can eat Bijudama's lol, forgetting Petra path? And if Sasuke gets the Rinnegan he will be so OP that Naruto simply can't match him and thats forgetting sage mode lol.