Rasengan and Chidori
Ever since Naruto and Sasuke's battle at the Valley of the End, I have believed that the Rasengan and the Chidori have been balanced. Each has an opposite of relatively equal power and cause. These are listed and speculatd in the table below. Everything with a question mark beside it I have made up the name for myself.
Big Ball Rasengan
| Advanced Chidori?|
Cursed Seal Chidori
Wind Release: Rasengan
Wind Release: Rasenshuriken
| Chidori Katana?|
Nine-Tailed Rasengan and Cursed Seal Chidori
The Nine-Tailed Rasengan (Naruto's Ultimate Technique in Naruto Shippūden: Ultimate Ninja Storm 2) and the Cursed Seal Chidori (Sasuke's Ultimate Technique in Naruto: Ultimate Ninja Storm) are usually considered the same as the Vermillion Rasengan and Flapping Chidori respectively but I believe they are different.
The Nine-Tailed Rasengan only requires Naruto to enter his Initial Jinchūriki Form while the Vermillion Rasengan requires him to enter his One-Tailed Form. The direct equivalent to this, The Cursed Seal Chidori only requires Sasuke to enter his Cursed Seal: First State while the Flapping Chidori requires him to enter the Second State of his Cursed Seal.
The colour also changes: the Nine-Tailed Rasengan is orange in colour while the Vermillion Rasengan is purple. Likewise, the Cursed Seal Chidori is pink while the Flapping Chidori is black.