Fūton: Rasenshuriken

Fūton: Rasenshuriken (風遁・螺旋手裏剣, Wind Release: Spiraling Shuriken) was previously confirmed on the third Smash Flash DOJO!! to be Naruto Uzumaki's Side Special Move in Super Smash Flash 2. Naruto would have summoned two Kage Bunshins to form a giant Rasengan in his hands. Afterwards, one clone kicks in front of him and Naruto would throw the projectile. According to the Flash2Dojo, the fan DOJO!!, the projectile would have had infinite range, but would have been nowhere near as powerful as the regular Rasengan.

Trivia

 * In both the manga and anime, using the Rasenshuriken deals intense cellular damage to Naruto's arms and hands, but it's unlikely that this would have transferred over to SSF2.