At first, there were a number of hand signs required to perform the Chidori, ... Naruto is available to stream on Crunchyroll. MORE: Naruto: The Strongest Genjutsu Techniques, Ranked.

Unlike Chidori, the Rasengan does not have any nature transformation or need any hand signs to use it. Later in the series, users apply their innate chakra nature to create a stronger version of it.