Rasengan, Narutopedia

The Rasengan is a jutsu that takes form as a spinning ball of chakra, invented by Minato Namikaze. Minato came up with the idea for this technique after seeing a Tailed Beast Ball being used. Because his lover, Kushina Uzumaki, was a jinchūriki, she would inevitably be deployed to fight opponents who would use Tailed Beast Balls against her. Minato therefore wanted to develop a technique that Kushina could use to match against those opponents, which also worked with her chakra volume as a jinchū

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