Board Thread:Theories and Speculation/@comment-33202319-20150622205123/@comment-10288287-20150623030759

Personally I think it is a lightning release rasengan or a variation of the chidori without the need for the sharingan. The former seems more likely however. The base of the rasengan is simply a compressed spiraling sphere of chakra. When Naruto adds a wind release to the rasengan we see small blades of wind form around it. It could likely be that each element when added has it's own affect.