Wind Release: Rasengan

The Wind Release: Rasengan is an original technique created by Naruto Uzumaki, expanding on the original concept for the Rasengan: mixing one's chakra element with the Rasengan, emphasising the combination of the highest forms of Shape Transformation and Nature Transformation.

Background
Minato Namikaze, the creator of the Rasengan, had always intended the technique to be mixed with the user's elemental affinity. However, the task was too difficult for him to complete before his death, and his student, Kakashi Hatake, was unable to complete it as well. Yamato noted that adding one's chakra element to the Rasengan takes an incredible amount of skill, or rather natural talent or instinct.

Naruto was able to mix his Wind Release chakra with the Rasengan during his training, maintaining its original stability and increasing its destructive power, far beyond that of his ordinary Rasengan. An example of the power that element manipulation adds to the Rasengan is shown when it was tested against Kakashi's standard Rasengan. The fact that it was only partially completed, but still be able to easily overpower Kakashi's Rasengan and damage his hand demonstrates just how far the Rasengan had been pushed when combined with elemental chakra.

Usage
To create it, Naruto needs the aid of two shadow clones and, in total, five hands (his hand to release and spin the chakra, one clone to form the shell to maintain the sphere shape, and the other to mix the wind-natured chakra). This technique looks fairly similar to an ordinary Rasengan, except it has four small white blade like protrusions surrounding it, making it look like a miniature fūma shuriken. The concept of a completed Wind Release: Rasengan would be the rotation and power of the Rasengan, and Naruto's wind-natured chakra condensed into a stable sphere.

Trivia

 * In the anime, Asura Ōtsutsuki developed an unnamed precursor to this technique.