Inner Sakura

is a manifestation of Sakura Haruno's inner emotions. Inner Sakura represents Sakura's actual opinion on things when she outwardly displays something opposite. Inner Sakura's appearances are typically marked by an exclamation of "Shānnarō!" (しゃーんなろー). The phrase has no literal meaning, but is usually translated as "Hell yeah!", "Hell no!", or "Damn it!", depending on the situation. The English anime translates it as a forceful "Cha!" Inner Sakura is unique as it is in a way a second will within Sakura's mind. When Ino uses Mind Body Switch Technique on her, Inner Sakura was able to repel the user from her body.

Although she appears quite frequently at the start of the series, Inner Sakura all but disappears midway through Part I, and rarely appears in Part II. The reason behind this is that she no longer needs to hide her true feelings or reactions behind a fake smile, finally allowing herself to truly say whats on her mind. However, because Inner Sakura usually possessed somewhat violent reaction to things, Sakura is prone to violent outbursts which is not helped by a her chakra-enhanced strength, making her very scary should one upset her, similar to her teacher Tsunade.

Trivia

 * In the Ultimate Ninja and Clash of Ninja videogames Inner Sakura is used as a jutsu due to Sakura's lack of jutsu of her own.
 * The symbol that's written on Inner Sakura's forehead literally means "Inner Sakura"
 * A anime filler arc has shown Ino having her own version called Inner Ino.