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Yamanaka Ino is a childhood friend of Sakura who helped the girl develop her own character. Sakura broke off their friendship upon discovering Ino liked the same boy as she did- Uchiha Sasuke.
As a member of the Yamanaka clan, Ino can control the minds of others. She can either enter minds, or disrupt a persons movements.
She and Sakura argue much, mostly over Sasuke although Ino seems to have gotten over him later on in the manga. Being a minor character, Ino does not appear as ofter as some other characters. When we see her, the majority of the time she is arguing with Sakura. Because of this, we rarely see any other side to the Yamanaka.