He watched Kushina use the tailed beast bomb
naruto strongest rasengan is massive rasengan and nine tail fox rasen shuriken by:hao to
Nine tails [Kyuubi] Rasengan or the Vermillion Rasengan
When you have little healts and use normal rasengan red rasengan (nine tailed fox rasengan) must appears
Nature chakra is the energy from the earth. Not elements. Naruto's element is wind, not fire. It would be very hard, or nigh impossible for Naruto to attain the ability to create a fire Rasengan.
seven-colored rasengan,kyubii rasengan,gelel rasengan, twin rasengan (kyubii and gelel rasengan), crescent moon rasengan,oodama rasengan (great ball rasengan), super great ball rasengan, naruto-shion chakra rasengan, and rasengan the spriral chakra sphere,Determination rasengan,tornado rasengan,dark rasengan
Jiraiya
Yes, he does
rasengan
yes he does
No!!!!!!!........in naruto manga and episodes there are only rasengan,demon fox rasengan,odama rasengan,super great ball rasengan,raserengan,.ultimate rasengan, double odama rasengan, rasengan wind release, wind release rasenshuriken also rasengan riot, great ball rasengan barrage, mini-rasenshurilen, planetary rasengan, rasengan vaccum, and the Flash (Bijuu) Bomb to an extent Edit by Axel
The 4th Hokage Jiraiya learned rasengan and taught naruto who made an origanal rasengan
a bigger stronger version naruto made himself to improve his rasengan