Description
As the Nobody of Kairi, Naminé bears a resemblance to her, though, like with Roxas and Sora, this resemblance is a bit more subdued than most. Naminé shares Kairi's blue eyes and general body structure. Naminé remains virtually unchanged from her appearance in Chain of Memories to Kingdom Hearts II, wearing the same plain, white, lace dress and light blue sandals. However, in Chain of Memories, it was more obvious that she had rosy cheeks and pale, pink lips.
She looks more mature and taller in Kingdom Hearts II, which results in the dress reaching to about mid-thigh as opposed to just above her knee as it was in Kingdom Hearts: Chain of Memories. In both of her appearances, Naminé has blonde hair that is somewhat longer than Kairi's that usually drapes over her right shoulder.

Personality
Naminé was born without memories and without the knowledge that she had emotions, due to the unusual nature of her birth. Because of this, she had no basis of any acting upon her birth. She simply followed the orders of whoever was close to her because it was the only obvious guidance she had, effectively making her very quiet and fragile in personality. This led to her discovery of her ability to feel, as often times she found that blindly following her captors hurt others, something that made Naminé feel responsible and guilty. Naminé often rebelled against her captors because of this guilt in favor of trying to redeem herself by helping someone, sometimes leading to her being a damsel in distress. Rebelling and constantly switching sides caused Naminé's determination and drive to grow significantly from her first appearance. Her more driven personality was put to good use, often going about in the Corridors of Darkness to help the games' other protagonists. She is also apparently very talented with her drawing, as seen when she finished a complex drawing of Castle Oblivion in Kingdom Hearts: Chain of Memories.
Like Roxas, Naminé seems to possess true emotions, being a special and unusual Nobody. While most Nobodies pretend to have emotions by acting on the memories of their past lives in order to react to a specific situation, Roxas and Naminé had no memories of their past lives, and thus had no basis for any acting.
Examples of Naminé's emotional capacity are as follows:
She felt lonely, which eventually led her to attract Sora to Castle Oblivion.
She feared for Sora's life when he was about to be killed by the Riku Replica, even going so far as to completely shatter the replica's false memories.
She willingly threw herself between Sora and Larxene to keep her from killing Sora.
She showed genuine remorse and guilt for what she had done to Sora, Donald, and Goofy.
She laughed in amusement at Donald and Goofy's teasing comments and jokes about how Sora always acts around girls.
She was surprised and frozen in fear when Marluxia used her as a shield against Axel.
She angrily refused to destroy Sora's heart even when threatened with death by Marluxia.
She was disappointed that Sora should forget her in order to become normal again.
She willingly accepted that Sora chose to forget her.
She began to cry after she put Sora into slumber in his memory pod.
She was willing to go against DiZ's orders to assist Roxas.
She happily smiled at Roxas through Kairi when Sora returned to the islands with Riku in the FMV ending of Kingdom Hearts II.

Equipment
Unlike other humanoid Nobodies, Naminé's talents do not lie in battle, but in the ability to control memories, making her a "witch". The ability comes from the fact that she is formed from Sora's soul and body, rather than Kairi's. Because of this connection, Naminé can move around the "links" of his memories that are located within his heart to her liking, as well as the ones of those who are connected to Sora. She can even sever them completely, turning the victim into little more than an empty shell. In addition, she can create objects affected by the new memories, evidenced by turning a card into a good luck charm for the Riku Replica and altering the appearance of Kairi's Lucky Charm to resemble that of a Paopu fruit. It is noted in Kingdom Hearts II that everybody who Sora, Donald, and Goofy met and worked with in Kingdom Hearts had mostly forgotten about them until recently; this could mean that the Castle Oblivion incident also somehow caused the other characters to lose their memories of Sora, and they regained all of them when Sora awakened.
She can also cover up Sora's memory of Kairi with her own image, but as she is Kairi's Nobody, it is impossible for Naminé to completely snuff out Kairi from anyone's memories, as shown when he regained a small memory of her even though he couldn't think of her name. Conversely, those with the greatest connections to Sora cannot ever completely forget him, as evidenced by Kairi, who still slightly remembered Sora, but not his name, his face, or the sound of his voice, while all other denizens of the Destiny Islands (along with all the people in other worlds) had completely forgotten about Sora's existence.
Naminé also has another limitation to her power. When Naminé took on the task of re-chaining Sora's memories together so that he will remember everything he had forgotten, but lose his memories of Castle Oblivion, she was unable to make much progress. DiZ reasons that it must be because Sora's other half, Roxas, is missing, and in order to completely restore Sora, Roxas and Sora must join with one another. This is half-true; the main reason behind this is because of Xion, a memory-based clone of Sora created by Xemnas.
How Naminé actually manipulates memories is something to be noted. As she is always drawing pictures on her sketchpad, DiZ believes that she draws in order to capture the memories she needs to chain together. Because of this, the walls of her room are covered by pictures of events, places, and people that are in Sora's memory. Several of them are also of Roxas, implying her ability to fiddle with Roxas's memories as well; in fact, it is highly likely that Naminé is the one who erased Roxas' memory of his time in Organization XIII and replaced it with the fake one he had of Twilight Town. She also might be able to cause things in her drawings to affect people in real-life, as shown in the opening FMV of Kingdom Hearts II, when she places Sora inside of a stasis pod by drawing a picture of him inside of one. This is, however, a dramatic license, taken to shorten the plot for quick recap in the brief FMV.
Darkness
Naminé, being a Nobody, can also access the Corridors of Darkness to her liking, but she only does so three times; once to communicate with Roxas and inform him that he will not cease to exist when he joins with Sora, once to help Kairi and Pluto escape from their prison cell, and then to return Sora and co. to Destiny Islands. She also seems to be able to use the power of darkness to change her physical appearance, as seen when she uses Kairi's form to help Riku; however, this could be because of her connection to Kairi.

History
Naminé was born when Sora stabbed himself with Ansem's artificial Keyblade in order to restore Kairi near the end of Kingdom Hearts. This made Naminé a very odd Nobody, born from Kairi's heart and Sora's body and soul. Kairi's own body never became a Nobody because her heart lacked darkness (since she was one of the Princesses of Heart), so her body and soul were never able to leave the Realm of Light and thus made it seem like Kairi was in a comatose state until she regained her heart. However, this means that Naminé was also born without Kairi's memories, only furthering her status as an unusual entity, and she and Kairi are incomplete without each other. And because of the fact that Naminé is formed from Sora's body, she has the power to manipulate his memories as well as the memories of those who are connected to him, prompting several others, even herself, to call her a "witch". She came into being at Castle Oblivion, found by Organization XIII.
Ansem the Wise stated in Report 9 of the Secret Ansem Reports that Naminé is a highly unusual Nobody, due to possessing neither the body nor the memories that a Nobody is usually made from.
Naminé is the Nobody of Kairi, and wields the power to manipulate the memories of Sora and those close to him. Her first appearance is in Kingdom Hearts: Chain of Memories. The nami of her name means "ocean wave" in Japanese.

So begins...
Peter winces underneath his helmet again. Another headache, and he wasn't quite sure how he got here. He coughs once, and again presses his leather gloves against his metal temple. As he looks around, there are quite a lot of figures, both human and not quite human in various places in the trees. He stumbles through the dirt toward the three figures closest to him, his heavy metal boots pressing deep indentations in the earth. He gives a friendly "Howdy," to the figures, one of which looks like an... Octopus? The other two looked human enough, but as he got closer, he wasn't quite sure about one of them. He makes out pointed ears, and almost immediately asks, "Hey, Moon, is that you?" As he gets closer, though, he doesn't think so. They were dressed quite different.
He takes off his helmet in the hopes that maybe he'll be able to see better in the dark, but it doesn't help much. He says again, "Howdy, what are y'all doing here?"
Thumbnail stared at Bloop-5 for a moment, examining its structure while still keeping a bit of caution. After a moment, he withdrew his right hand from his black robe collar, holding a purple handkerchief. Thumbnail glanced at Bloop-5 with a bit of hesitation before moving his hand closer to it. He noticed that the machine was somewhat dirty and neglected, its strange small red eyes glowing rather dim, so Mabus used his purple handkerchief to wipe the octopus-like robot's face, polishing its metallic exterior in hopes that it might be able to see him better, and perhaps deem the Darkelf as less of a threat.
That wasn't to say there weren't hidden dangers in the forest. As he put away his handkerchief, Thumbnail's dark vision and elven senses started to kick in. He started to sense a powerful presence in the Dark Woods, one of great size and a familiar scent. "Dragons" he whispered to himself, becoming more aware of his surroundings in the dark. But there was something else closing in on his position. Thumbnail's pointy ears perked up as Peter coughed. Humans were always easy to detect, for even the stealthy ones were loud and smelled funny to elves. Thumbnail was able to detect him coming from a mile away, and could see Peter R. Sheffield approaching even in the dead of night. Thumbnail's golden eyes shimmered again briefly as Bloop-5 scanned over them, and he glanced down at the inventor again before peering into the Dark Woods.
Peter's heavy boots made quite a ruckus to the Darkelf as he approached the scene, greeting them from the darkness. Thumbnail stood there motionlessly as the man approached the clearing before stopping to remove his helmet. "Hello there," Mabus said calmly while looking directly at the man in the heavy armour. It was obvious that Peter couldn't see him very well in the dark, but Thumbnail's voice alone was enough to inform the stranger that he was not this Moon character. Mabus examined Peter's metal suit for a moment, but said nothing as he looked around, still sensing another hidden presence in the immediate area. The Darkelf was very keen and aware of the hidden dangers in the darkness, even if nobody else could feel it.
At that moment, Peter R. Sheffield spoke again. "Howdy, what are y'all doing here?" he asked. It seemed like a legitimate question to most people. "I should be asking you the same," Mabus answered. After all, Mabus was a Darkelf, and the Dark Woods were as natural to him as a fish in water. If anyone was out of their element, it was the strange inventor and the man in the metal suit. What were humans doing this deep in the Dark Woods at this hour of the night? Mabus found that to be quite suspicious and strange. After a moment, Thumbnail reached back into his black robe and pulled out a small glass vile with a cork in it, containing a strange glowing blue liquid which appeared to be some kind of elixir.