(not including so6p as he is the obvious first pick)
1) Madara ( he has been around pretty much forever and has extreme power)
2) Tobi ( theres lots of mysteries still but he owns. Although he has the Tailed Beasts as backup)
3) 1st Hokage (he's badass regardless of what anyone thinks, element and bloodline=boss)
4) Itachi (probably would have been considered strongest shinobi ever if he would have stayed in the village and didn't work under Danzo, but overall he is BA and was extremely powerful in all aspects)
5) Nagato (if he uses his power in one he could have been an even bigger force IMO but still would have beaten almost anyone)
6) Minato (ftg was very BA, but that's about all)
7) 3rd hokage (knew a lot of techniques but we weren't able to see him really do his thing, but he gets kudos for his rep)
8) Raikage (hes just overall a powerful dude and is a force)
9) naruto (would be higher, but he's been given most of his strength)
10) Sasuke (from what we have last seen from him, he is getting up there with the others)
This is what i think.
1) Madara ( he has been around pretty much forever and has extreme power)
2) Tobi ( theres lots of mysteries still but he owns. Although he has the Tailed Beasts as backup)
3) 1st Hokage (he's badass regardless of what anyone thinks, element and bloodline=boss)
4) Itachi (probably would have been considered strongest shinobi ever if he would have stayed in the village and didn't work under Danzo, but overall he is BA and was extremely powerful in all aspects)
5) Nagato (if he uses his power in one he could have been an even bigger force IMO but still would have beaten almost anyone)
6) Minato (ftg was very BA, but that's about all)
7) 3rd hokage (knew a lot of techniques but we weren't able to see him really do his thing, but he gets kudos for his rep)
8) Raikage (hes just overall a powerful dude and is a force)
9) naruto (would be higher, but he's been given most of his strength)
10) Sasuke (from what we have last seen from him, he is getting up there with the others)
This is what i think.