Destiny Islands, named Destiny Island in Kingdom Hearts II, is a world from the Kingdom Hearts series. It is the home world of Sora, Riku, and Master Xehanort. The world seems to be led by an unnamed mayor, who is mentioned as Kairi's foster father.
The Destiny Islands is playable during the prologue of Kingdom Hearts and Kingdom Hearts 3D: Dream Drop Distance. However, the remains of the Destiny Islands reappear at the End of the World. A memory-based version of the world appears in Kingdom Hearts: Chain of Memories. In Kingdom Hearts II, Kingdom Hearts 358/2 Days, and Kingdom Hearts Birth by Sleep, the world is not playable and only appears in cutscenes. In Kingdom Hearts coded, a data version of the world appears as the first full playable world.
The main function of this world in the original Kingdom Hearts is to serve as an extended tutorial where the player can get the hang of battle mechanics against opponents without being incapacitated, gain experience, and receive items for future battles.
 Settings and Areas
The main island is where the residents live and go to school; Kairi and Selphie are known to go to the same school. The main island also has a small beach and dock. There appears to be a fairly large town in the background, with a long clay path leading to the beach. Sora's House can briefly be seen before Sora encounters the Darkside. However, the only portion of the house which can be seen is Sora's bedroom during the storm.
The smaller island, where Sora, Riku, Kairi, Selphie, Tidus, and Wakka play, is where all of the playable scenes take place. It is reached by canoe from the main island. The Seashore area is naturally covered in yellow sandy beaches, exotic trees and shrubbery, and wooden constructions. There is a Seaside Shack and a large treehouse built into an enormous tree. The Seaside Shack contains the island's only Save Point. A miniature island is settled next to the island and can be reached by crossing a bridge (which can be accessed by using the stairs in the Seaside Shack mentioned above or alternatively, by swimming towards a ladder on the opposite side of the island, and then climbing it). Sora can also have duels with Wakka, Selphie and Tidus nearby in the first game. Sora and Riku often practice their sword fights at the place where the friends can watch the sunset—past the Bridge, on the miniature island. On that island is a crooked palm tree that grows Paopu Fruits. Local myth dictates that the two people who share one will have their destinies intertwined. The Cove at the back of the island has an obstacle course which Sora and Riku use during their competitive challenges.
The Secret Place is a cave hidden behind the island's waterfall, where the children visited during their childhood. Sora and Riku first discovered it when they were young children. There is a door in the cave which is actually the Keyhole of the world. The cave's walls are covered in chalk drawings, some hinting at the earlier encounters of the children. Among them is a drawing of Sora and Kairi sharing a Paopu Fruit. Riku enters here near the beginning of the game and opens the door, unleashing the Heartless onto the islands. Whether he did so knowingly and willingly is unknown, though it is likely that the words of Xehanort influenced him to do so.
At the beginning of Kingdom Hearts Birth by Sleep, a young Xehanort stares at the sunset and states that the world was too small. Many years later, he returns as an old man, intending to leave his seemingly dying, comatose apprentice, Ventus, at the islands for his final days. However, Ventus's broken heart connects with that of the newborn Sora, and he revives, summoning his Keyblade. Seeing further use in the boy, Xehanort immediately takes him to Master Eraqus at the Land of Departure.
Terra is the first of the three Keyblade wielders to visit Destiny Islands. There, he watches a young Sora and Riku practice sword-fighting. After asking Riku why he wants to leave the islands, Riku explains that a man once left the islands to visit other worlds, and that he wants to do the same. Terra sees a vision of the man, then sees what Riku will become, convincing him to choose Riku as his successor so that one day he may wield the Keyblade.
Ventus later arrives on the island, where he finds Vanitas and learns the truth about his past, but never encounters Sora or Riku.
Aqua is the last to arrive on the island. After recognizing that Sora and Riku's friendship is identical to the bond between Ventus and Terra, she decides to choose Sora as her successor, but when she discovers that Terra has already chosen Riku, she changes her mind, not wanting to force the friends to fight. Instead, she asks Sora to save Riku if he were to ever fall into darkness.
On a night after Master Xehanort and Vanitas are defeated, Sora and Riku watch the stars on a beach facing the Small Island. As they prepare to depart home, Sora suddenly feels Ventus's sadness connecting with his heart. Riku advises him to try and reach out to that sad heart, and as Sora connects to Ventus's heart he enters his first Dive to the Heart. He joins his heart with Ventus's, hoping to make it happy again, then tells Riku that he was right as they go back to watching the stars.
In a prophetic dream, Sora is swallowed by the tide while trying to save Riku, and is transported to another world.
When Sora awakens from his Dive to the Heart, he meets with his friends Kairi and Riku. The three plan on building a raft and to set sail across the sea to find other worlds away from the island. Destiny Islands is a small world, which often leads to the boredom of its inhabitants, especially Riku, who desires to leave the islands and see the other worlds out there. Tidus once said that once you sail a certain distance from the islands, you simply can't go any further, but the other islanders believe he merely turned back and made up the story.
While gathering materials for the journey, Sora climbs into the Secret Place - a tiny cave on the island where the children scratch drawings onto rocks - and met a figure in a strange cloak who told him cryptic messages about the time to come. Sora's confusion lasts long into the night. Resting up in his bedroom, he sees a dangerous storm approaching, and hurries off the island to save the raft.
Upon arriving on the second island, Sora discovers his friends came too, but only finds Riku, who confuses him further by telling him to accept the darkness, after which, Riku disappears. He then finds an apparently-ill Kairi in the Secret Place. The two disappear in the growing darkness, but Sora returns as the Islands slowly crumble into darkness with the Keyblade in hand. He fights with the Darkside boss, but fails to save his home, and is whisked away on his journey to Traverse Town.
As his first journey ends, Sora and Kairi meet up on the shores of the reforming islands. Sora, knowing that his job is not finished, and that he must still save Riku and King Mickey from the Realm of Darkness, leaves Kairi in the safety of her hometown and promises to return to her as soon as Riku and King Mickey are found.
Some time after Ansem's defeat, Tidus, Selphie, and Wakka run across the beach, much like Riku, Sora, and Kairi did earlier.
After the Riku Replica is defeated on the 11th floor of Castle Oblivion, he drops his Wayfinder charm, which is revealed to be the World Card for Destiny Islands. Sora rushes to use it in order to get to Naminé, but when Goofy and Donald urge him to be cautious, he angrily rebukes them, and goes through the memory world alone. Naminé manipulates his memories to make Sora believe she also lived on the Destiny Islands, and Sora is urged by his memories to rescue her. However, after he defeats a memory Darkside, Naminé appears and reveals the truth about Kairi, herself, and what she has been doing to Sora.
After Riku defeats Lexaeus, Zexion appears with a world card and entices Riku to enter his own version of Destiny Islands. Unlike Sora, Riku finds no one on the islands, except a memory of his Darkside, the one who devoured the islands. After defeating the monster, he sees "Sora", who is in actuality Zexion in disguise. "Sora" accuses him of being a monster of darkness, and attacks him with light. In the light, Riku considers giving up, but Naminé (disguised as Kairi) speaks to his heart and urges him to use both his light and his darkness, which are invincible together. Riku sees through Zexion's disguise and attacks, forcing Zexion to flee.
Roxas is seen near the bent palm tree with Axel looking in the distance while talking. Xion is also known to have visited the Destiny Islands, as a scene showing a discussion between her, Axel and Roxas is shown. Xion has also been seen on Destiny Islands speaking to Riku, and it is implied that the seashells she brought Roxas while he was unconscious came from the islands. During Xion's nightmare, she transforms into Roxas, Riku, and Sora while listening to the speech that Zexion gave Riku near the bent palm tree.
During Sora's sleep, the residents of the Islands forget all about Sora, due to Naminé breaking the chains of his memories. Kairi, however, being so close to Sora, still retains vague memories of the boy, and begins to remember before anyone else. She sends a message in a bottle across the sea, hoping to find Sora.
Finally, after Xemnas is defeated, all the characters meet up on the Islands for one last time. King Mickey, Jiminy, Donald, Pluto, and Goofy return to Disney Castle, and leave the others on Destiny Islands.
After King Mickey and Jiminy discover a message in Jiminy's Journal, they create a data version of Sora. After Sora exits his Awakening, he finds out that the island is covered with Bug Blox Corruption which Data-Sora must delete. Afterwards, he encounters Jiminy's Journal wearing the Black Cloak. He then finds the Data Keyhole behind the waterfall of Destiny Islands. After he opens it he fights Darkside, the island's source of Bug Blox corruption. Then the data island is destroyed, just as it was in the first game. The digitized journal then displays Ansem, Seeker of Darkness appearing before Riku, opening the Corridor of Darkness for him.
After leaving the Datascape once more, Mickey sends another bottled letter to Sora on the real Destiny Islands, which Kairi delivers to him.
While Sora is leaning on the bent palm tree, Riku approaches him and asks him if he had decided, about what is unclear. Sora replies to Riku that he had. When Kairi approaches the two, Sora tells her that he has another long journey to make, one that might be even more difficult than all of the others they have had. Kairi then gives Sora her Wayfinder charm and tells him to hurry back.
The Destiny Islands serve as the starting point for Sora and Riku's Mark of Mastery Exam. Taking on the forms of their younger selves, the young Keyblade wielders depart on a raft. Their voyage under way, Sora and Riku are caught in a terrible storm, after which a phantom Ursula rises from the ocean below and attacks. Sora and Riku emerge victorious, but upon Ursula's destruction, a whirlpool drags them underwater. Barely conscious, Sora and Riku use their Keyblades to unlock the Keyhole to Traverse Town.