Yes, they do find Riku at The World That Never Was.
Riku does lots of things in the kingdom hearts games. Riku tries to gain power and fights his friend sora. and he does more stuff
Roxas sora and riku of course
Riku is in Kingdom Hearts because he is one of Sora's friends on Destiny Island, and an important character in the series.*Slight Spoiler*As we later find out, Riku's destiny was written when he was chosen as a Keyblade-wielder, during the events of Kingdom Hearts Birth by Sleep.
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Of course he does! Sora, Riku and Kairi are all best friends. Despite the conflict between Riku and Sora during the first Kingdom Hearts, Sora knows that Riku's heart is being manipulated by darkness. Sora continues to look for Riku and the King (Mickey) after the events of Kingdom Hearts. This is the essential plot of Kingdom Hearts: Chain of Memories. There is proof that Sora cares for Riku when he finds him towards the end of Kingdom Hearts II. Sora finds Riku in The World That Never Was and falls to his knees, basically crying.
In the first Kingdom Hearts as well as chain of memories: Sora: 14 Kairi: 14 Riku: 15 In Kingdom Hearts II: Sora: 15 Kairi: 15 Riku: 16 (as well as 358 1/2 days) In Birth By Sleep: Sora: 4 Kairi: 4 Riku: 5
Kingdom hearts 2 is a game that helps continue wat happened before on kingdom hearts 1 when sora went to kingdom hearts to find his friends. But in the first game he only got 1 friend back on the other side. And that side was at there island. So now in kingdom hearts 2 sora has to find his other friend named riku. And this time sora and the others find more secrets that were kept. And sora is going to find out that riku never wanted sora to find him and that sora and a girl that's friends with and her name is kairi that they both have nobody's that helps sora to his quest. And in the second game of kingdom hearts in the end they all go back to the island but the adventure doesn't stop there. Its not a rumor but kingom hearts 3 is going to come out for the ps3 its call kingdom hearts 3 birth by sleep.
Sora and Riku, along with Kairi, are best friends. They all grew up together on Destiny Islands, and have remained best friends throughout the Kingdom Hearts franchise.
Sora, Kairi, Riku, Donald, and Goofy!
Yes, The game is basically split between Sora and Riku.
Riku is seen with the Dark Keyblade when Sora talks to him in Hollow Bastion in the original Kingdom Hearts game. However, Riku changes it when Sora fights him.
beat the game as sora