General info :
Riku is a childhood friend and rival of Sora who resides with him and Kairi on the world of Destiny Islands. Originally appearing as a non-playable character in the original game, where he is introduced as a 15- year-old boy, he has a playable role in the "Reverse/Rebirth" story mode of Chain of Memories, the multiplayer mode of 358/2 Days, and the core story of Dream Drop Distance. He is also a computer-controlled party member exclusive to the final level of Kingdom Hearts II, and is temporarily playable during a sequence where Sora is incapacitated in the game's final boss battle. Riku is also briefly playable at several points in the "Dark World" in Kingdom Hearts III and is playable a few times in the Re Mind expansion of Kingdom Hearts III. His signature weapon is the "Soul Eater" sword, a manifestation of the darkness in his heart. During the first game, Riku is revealed to be the rightful owner of Sora's Keyblade, which is bequeathed onto the five-year-old Riku by Terra during the events of Birth by Sleep; however, his reliance on the power of darkness causes the Keyblade to reject Riku in favor of Sora. In Kingdom Hearts II, the 16-year-old Riku acquires another Keyblade of his own, the "Way to the Dawn"; this Keyblade is later broken in Kingdom Hearts III, leading him to obtain a new Keyblade, "Braveheart".