The Rasengan (螺旋丸; Literally meaning "Spiraling Sphere") is a powerful A-rank technique invented by Minato Namikaze, though after three years of development he never saw it completed. Minato's idea was to take the Shape Transformation of his chakra to the "highest possible point" and then combine his chakra´s nature affinity to it, creating a jutsu that didn't need the aid of time-consuming Hand Seals to control. He died before he could accomplish this, but, on shape manipulation alone, the Rasengan is still a very useful, powerful, and difficult jutsu to learn.

The debut of the Rasengan in the anime is on Naruto episode #86, in manga is on chapter #150.

It´s a Short-range, Offensive and A-rank technique.

The only users of the Rasengan until now are Minato Namikaze, Jiraiya, Naruto Uzumaki, Kakashi Hatake and Konohamaru Sarutobi.

In Part I, Jiraiya taught Naruto how to use the Rasengan, breaking the learning process into three steps:

• The first step was learning how to burst a water balloon by spinning the water inside in multiple directions at once using only the user's chakra, which emphasizes rotation.
• The second step was for the user to burst a rubber ball, and since rubber is thicker and air is completely different from water, it forces the user to use denser chakra to break it. This step emphasizes power.
• The last and final step was to combine both step one and two by spinning chakra inside a balloon without moving the balloon itself, emphasizing stability of the sphere shape.

Naruto has been seen using a one-handed Rasengan in a one-tail transformation.

The Rasengan doesn't require any hand seals to use, relying only on the chakra control of the user. Once it's complete it becomes self-sustaining, which does not give Rasengan a definite limit like its counterpart, the Chidori. The compacted nature and moving speed of the chakra allows the Rasengan to grind into whatever it comes in contact with, inflicting major damage. This also tends to launch the target backward once hit. In an anime filler arc, Naruto was able to perform this jutsu as a mid-range projectile technique by somehow throwing it into a wall.

The Rasengan was designed to use the caster's elemental affinities. Minato was unable to add his affinities to his Rasengan before he died. Kakashi tried to add his lightning element to the Rasengan, but was unable to and explains that he uses the Chidori and Lightning Blade instead, which requires a certain point of shape manipulation and nature manipulation itself. Naruto was the first to add his wind affinity to his Rasengan and even advanced it to the point that he was able to create the Wind Release: Rasenshuriken.

Guts Rasengan 

 THE END

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