Savior? You'd think that's the last word you would ever think of to describe Naminé, but that's not the case. She's out there and about saving the people that are very dear to Sora. Why you might ask?

Naminé, like Kairi would have a pure heart if she had one since she is her nobody; but after what she had done to Sora in Kingdom Hearts: Chain of Memories, she felt as if she needed to repent for those sins. Time and time again after the incident with Sora, she saves more and more people by either helping them find the light or freeing them from a dungeon.

Sora was the first one she had helped. She fixed his memories putting everything back to normal. Riku had been next after his fight with Zexion in Reverse/Rebirth when Riku was lost in the darkness. She disguised herself as Kairi and told Riku to follow the light instead of the darkness that had disguised itself as the light. Naminé helped him figure out the path he had needed to follow. Even the six days with Roxas. She was the one helping him solve the truth about his past, and the time when Kairi was trapped by the Organization. Naminé was the one who helped her escape.

Though she doesn't fight to save the people in trouble, she is still there for them every step of the way.