Editing Memory

After [[Ventus]] is defeated by the [[Neoshadow]]s sent out by Master Xehanort, and stripped of the darkness in his heart, he was left without his memory. When [[Terra]] and [[Aqua]] later attempted to ask him questions, his confusion due to the lack of memories caused him to panic and fall unconscious. Later, on Destiny Islands, Ventus encounters Vanitas, and begins to remember several of his lost memories.

Much later, after Master Xehanort takes over Terra's body, Terra fights back several times, prompting the new [[Xehanort]] to turn the Keyblade on himself to rid himself of Terra's heart, but Terra's heart still remains inside Xehanort's body and this leads to Xehanort's amnesia, rendering him unable to wield the Keyblade anymore.

Throughout his adventure, Sora experiences flashbacks to him and [[Riku]] as kids on [[Destiny Islands]]. One piece of memory was when they first went into the secret place and they first saw the door. This is also when they talk about Kairi first coming to the island. Kairi's heart, and therefore her memories, are inside Sora's body for much of the quest. This causes him to periodically see visions of her. Also, Sora's mind once connected to Kairi's memories inside her heart. This allowed him to see a forgotten memory of Kairi and her [[Kairi's Grandma|grandmother]] in the library of [[Hollow Bastion]], just talking.

Memory is also one of the ingredients [[Dr. Finkelstein]] asks Sora, [[Donald]], and [[Goofy]] to retrieve. It appears in the form of a Forget-Me-Not, and is given by [[Sally]]. Dr. Finkelstein uses it in an attempt to make a synthetic heart so [[Jack Skellington]] can make the Heartless dance, but the experiment fails.

While Sora and company climbed the floors of Castle Oblivion, [[Naminé]], under [[Marluxia]]'s orders, was slowly stripping the hero of all his memories, only to replace them with new, false ones. Also, [[Vexen]] makes a replica of Riku and orders Naminé to put false memories of him, Sora, and herself at Destiny Islands, with the Replica replacing the real [[Riku]] and Naminé replacing [[Kairi]]. Later, when the [[Riku Replica]] fights and is about to finish off Sora, Naminé unwittingly erases all of the replica's false memories, causing him to faint. When he wakes, he remembers that he is just a replica.

After defeating Marluxia and rescuing Naminé, Sora is left to sleep in a memory pod while Naminé restores his chain of memories.

Although most of the members of Organization XIII have full memories of their pasts, Roxas and Xion do not. However, Roxas does experience hazy dreams and flashbacks of Sora's exploits when Roxas travels the same worlds that Sora previously visited. Also, Sora's memories were the source of both Roxas and Xion's power.

When Roxas is captured, DiZ orders Naminé to erase his memories and put in false ones of him, Hayner, Pence, and Olette. He is then put in a virtual copy of Twilight Town to hide from the Organization and absorb the last of Sora's lost memories. In the virtual Twilight Town, Roxas begins to see some of the memories of Sora in his dreams. He also begins to remember the memories of his former self when he makes his way through the mansion. After Roxas merges with Sora, his memories remain within Sora, as shown when Sora feels familiarity with Roxas's Twilight Town and friends.

To investigate the new message in Jiminy's Journal from the first ''Kingdom Hearts'', its content was transferred into a data world. Although the pages were erased by Naminé in ''Kingdom Hearts Chain of Memories,'' the memories of the journal itself remained intact.