Board Thread:Naruto Discussions/@comment-26636534-20151016181609/@comment-26537507-20151022153456

No, but for me personally a signature technique is based upon the frequency of its usage rather than its power. So while the TTB may be stronger than the Rasenshuriken, I don't class it as a signature because he doesn't use it particularly often. On the other hand, I would classify shadow clone jutsu as a signature because there are very few battles he doesn't use it in.

I think that the Rasenshuriken is different though. While the initial technique was created by Minato, Naruto made the Rasenshuriken so it's his jutsu. So regardless of its power or often it's used, I would consider the Rasenshuriken a signature technique because Naruto is the creator.