Konohamaru's Rasengan

Sometime during Part II Naruto taught Konohamaru how to use the Rasengan. His version of the Rasengan is, like Naruto's, performed using a shadow clone to control the power of the chakra, but is smaller than Naruto's (regular-sized in the anime). After hearing how he used Rasengan against Pain, Naruto praised him, and promised Konohamaru that he would teach him how to make a bigger one. Later, in the anime, Konohamaru learned how on his own to perform the Big Ball Rasengan, greatly shocking Naruto.