King Mickey

King Mickey is the ruler of Disney Castle. He is only playable in certain battles in Kingdom Hearts II; if Sora and his friends are defeated, King Mickey will step in to fight in Sora's place until he is defeated or resurrects Sora. Mickey's inclusion in the series was initially restricted to a small cameo for only one scene. The larger role he played in the sequels first required the approval of Disney.[ He left his world when the Heartless began to attack. While he had Donald and Goofy find and protect the Keyblade Master, Mickey was on a mission of his own. In Kingdom Hearts: Chain of Memories and Kingdom Hearts II, he returns wielding the Keyblade of the dark realm. His story will be further explored in the upcoming mobile phone game Kingdom Hearts coded.

Namine

Naminé (ナミネ, Namine) is an original character created for the Kingdom Hearts series. She has the ability to change memories of those in relation to Sora by rearranging them and creating new links between them.
In Kingdom Hearts II, Naminé is revealed to be a "special Nobody" born from Kairi's heart when it left Sora's body. As Kairi had no darkness in her heart, her heart hid within Sora's body instead of becoming a Heartless when Destiny Islands was consumed by darkness. When Sora impaled himself with the dark Keyblade, his body and soul were used to create not only Roxas, but Naminé as well. As a result of this, she has none of Kairi's memories. Naminé's special birth in conjunction with the fact that Kairi's heart had been in direct contact with Sora's is why, DiZ states, that Naminé's special powers could only affect the memories of Sora and those whose hearts are connected to his, which was why she was used by Organization XIII. Despite DiZ's orders, Naminé visits Roxas in Twilight Town. She appears to him several times, often before he is attacked by Nobodies, acting somewhat as a guide to him. Riku was instructed by DiZ to destroy Naminé since he has no more need of her. However, as seen in KH2 Final Mix, Riku decided to let her go with Axel to repay the favor to her for Castle Oblivion. She is not seen again until near the end of the game where she frees Kairi and Pluto from imprisonment and they attempt to escape from the Organization's stronghold. Naminé gives up her own existence as an independent entity and fuses with Kairi to complete her, just as Roxas had with Sora in the beginning of the game.

Roxas

Roxas (ロクサス, Rokusasu?) is Sora's Nobody who was created when Sora became a Heartless to save Kairi. He was first featured at the end of Riku's ending in Kingdom Hearts: Chain of Memories and is playable in the beginning portion of Kingdom Hearts II. Roxas joined Organization XIII when he was found by Xemnas in Twilight Town. Unlike the other Organization members, he lacks memories of his previous life. During Roxas's time in the Organization, he and Axel became friends, but Roxas leaves to find answers as to why he possesses the Keyblade. After leaving, he was confronted by Riku who defeated him to have Roxas rejoin with Sora. Roxas' story will be further explored in the upcoming Nintendo DS game, Kingdom Hearts 358/2 Days