
Everyone and their mother knows that Naminé is an anomaly for a Nobody. Odd, not quite normal, not with her memory manipulation abilities, the ones that drew the Organization to desire to claim her and use her powers for their own good. But despite the need to have their abilities in their hands, no one has ever understood her powers whatsoever, only that she can only directly effect Sora’s (and by extension Roxas’) memories and those of a replica who she implanted with memories, and that it can effect others in return if they have the right connections.
Even Naminé herself does not fully understand her powers and the capabilities of them, but what she does she has never bothered to tell anyone else. Partly because no one has ever bothered to ask, and partly because she does not want anyone else to have any understanding of her powers at all. This is what she does understand, though:
“Feel” is relied upon for her abilities. Not physical feeling, but mental feeling, meaning that she reaches out and feels for memories in the process of finding them, and generally she relates her abilities with hands even though she doesn’t actually use her hands. As an extension of this, not exactly coincidentally, her abilities are amplified if she’s in direct physical contact with the subject.
Drawing is a practice that she took up in an attempt to help her book keep memories and keep them in line, because it’s easier for her that way. There is no other effects that drawing has on her abilities, other than aiding her in a physical sense.
It is no lie that she cannot effect the memories of anyone without a connection to Sora, that is the limitation of her abilities. This is likely because she was created from his body, though from Kairi’s heart, and because memories are stored within the heart of a person she has the ability to reach out and feel, experience, and change his memories however she wants.
There is no kind of distance range to her abilities. As far as she knows Sora or Roxas or a replica could be worlds away and she could still use her abilities on them, even though she has never bothered to try.
While Naminé’s abilities can be very powerful, if something interrupts them or something deviates from the path that she starts down on in the altering of them, then there is no way for her to go back and undo things and she can hit walls very easily. Such as when Xion’s creation made it impossible for her to finish fixing Sora’s memories or even move very far in her progress of them–it’s extremely easy to mess things up for her.
The ability to change the appearance of something lies in the manipulation of objects around her and the way people view them according to memories. If it is something of sentimental value to someone she has to alter the memory in which they were given it, and it causes a chain of changes that forces the person to see it as what they think it is, though it is not. This also means that when a person who was not there for the receiving of the object views it, they also see the altered object.
When she exercises her abilities to view memories (as manipulation and viewing are completely separate) she can see the memories playing in her head as if they were a movie for explicitly herself to view. In that moment when she is seeing those memories they are, in some ways, hers as they cycle through her head, but because of the limitations of a normal human brain she cannot keep all of them. So in manipulation she chooses a few, those that seem most important, and store them away inside of herself and through changing those they can change the others in return.
Because viewing memories is not the same as changing them there is the potential that she can peer into anyone’s memories if she tried hard enough, but she has never tried this. Probably never will actually attempt this, because to look into someone’s memories is to look into their heart, and is an extreme bypassing of their privacy and she’s not comfortable with that idea.
What Larxene had described as her breaking Repliku’s heart was actually rather accurate, but not quite. Memories are connected directly to the heart and she can reach out and touch them, and can shatter them apart which can make the heart more vulnerable and potentially kill a person, or at the very least leave them a shell of what they once were. If she’s practicing more caution however, she can simply break a piece of a person’s memories and hurt them. It’s unknown if she can “break” a person’s heart who isn’t Sora or a replica.
In the event that she becomes her own person it’s not known if she will retain her abilities, and perhaps they will become stronger, or if she’ll lose them entirely.