facepalm*
1)rikudo sennin:deafeats the juubi which THE WHOLE SHINOBI WORLD cannot defeat,not even with the likes of naruto there!!!!!basically this guy is god.(RINNEGAN,OP CT,BT,ST can create anything within certain perameters,juubi host)
2)hashriama senju:with control over all the bijuu and the most powerful KKG and instant healing it is seemingly impossible to touch him(mokuton,medical prowess,bijuu supression,genjutsu prowess)
3)madara uchiha:the only man of his time to rival hashirama in strength, he easily took on the 5 current kage(even if he is an edo that is certainly a good boast)(EMS,RINNEGAN,genjutsu prowess,gedo mazo)
4)nagato uzumaki: he can destroy a while ninja village with one attack and can control life and death(RINNEGAN,CT,BT,ST,gedo mazo,6 paths)
5)kabuto yakushi: edo tensei army along with sage mode and liquification and healing , a very tough and impressive combination(edo,SM,liquification,medical prowess,brains)
6)naruto uzumaki:he is basically a powerhouse, speed,strength,stamina,will power hes got everything except brains(and space time jutsu)genjutsu also does not work on him
(genjutsu innefective,BM,TBB,KM,SM rasenshuriken,kyuubi host)
7)sasuke uchiha:he is probably narutos equal seeing as the story is geared around both of them,however we have not seen him going all out)(EMS(not mastered),ameterasu,susanoo)
8)itachi uchiha:the genjutsu master(as of late),too boot he has great skills in every field,sadly with a small chakra pool it takes him further down the list in comparison to where he could be,he is a total genius(MS,genjutsu prowess,totsuka and yata)
9)gai somereandomunknownclan: i know it is odd but;in his 7th gate state he easily took out kisame who almost makes it onto this list, he still has the 8th gate to be revealed,i am sure it will put him here on the list(ninjutsu prowess,8 chakra gates mastery)
10)tobi/obito uchiha:rinnegan,chakra chains,space time jutsu mastery,a fighting genius and a physical monster,similar to naruto in terms of speed and power,sadly with the arrogance and predictability which is associated with him he is further down here than on most peoples lists(space time jutsu,MS,RINNEGAN,6 paths,gedo mazo)