She is often used to motivate Naruto when he's about to fail. Examples would be her motivating Naruto to beat Neji in part 1 or her fighting Pain to protect him and triggering his Nine tailed mode or her talk no jutsuing him after
had Naruto shook. Very huge contrast to sakura who is usually the damsel in distress and begging for Narutos help.
As far as her personal character, obviously her goal is to prove herself as a capable ninja after being such a big failure early in her life. She was born as the clans successor and couldn't handle that pressure so she was cast out to the village. Naruto was a huge inspiration to her early on and she often mimicked him taking on opponents she has no business taking on.
If anything, its Sakura who just exists to be apart of team 7 with no real family name or backstory other than the stuff with Ino.