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Plot details for the Kingdom Hearts series follow.

If I remember correctly, (SPOILERS) he sacrifices his heart in order to free Kairi. Kairi's deep feelings for Sora restored him to his human form, but Roxas and Namine were still created as a result. DarmaniTheFourth (talk) 20:15, November 14, 2012 (UTC)

Well, he stabbed himself with the Keyblade to People's Hearts, the dark one that Riku/Ansem was holding. That released his and Kairi's heart, and, well, he lost his heart and became a heartless. He got back to human form because of Kairi's memories or something mushy. - TidusTehSacrificer357 22:02, November 14, 2012 (UTC)