Who is the second Sage of Six Paths?
What is his suspense in the entire Naruto Story?
What is his past and upcoming role in Naruto?
What are his Six Paths?
For the best answer
The Second sage of Six Paths is the person who has fullfilled all the requirements to be classified as the sage. These requirements are his 'body' and his 'eyes'. Therefore, the person(s) who can be considered as the second sage is/are:
MAdara - He can be considered the jinchuriki-less Second Sage of six paths as he was the first person to combine complete the sages 'body' and therefore fully unlock the 'eyes'.
Obito - He can be considered the jinchuriki Second Sage of Six paths. Because he has the both and the 'eyes' - though he only has half the eye part, he also has the jinchuriki portion of the Sage of Six paths.
IMO, MAdara is closer to the Second sage even without the juubi because of the fact that he completed the body and unlocked the eyes himself, whereas obito uses 1 of madara's eyes.
I'mk going to assume it's for a final dramatic battle to unite the entire shinobi world into one. 'The blood of the covenant is thicker than the water of the womb'. The blood could be considered as the bloodshed of the war, and womb can be considered as the nations which 'birthed' these shinobi. I'm assuming his role is to unite all shinobi nations through the bloodshed and create a true peace, at least for some time.
The second sage never had a past role, I don't think so. But, his upcoming role i'd assume is what i said above.
His Six PAths are either;
-The six paths of pain which control different powers of the rinnegan - gravity, life/death, summoning, sealing, etc.
-The constituent requirements to fully form the sage - Body, Eyes, Juubi, ???, ???, ???
But, it's most likely the first.
Well i gave you my 2 cents. Take it or leave it, Derp obito is the one who faps over Sage, I dont know much about the sage.