why do you think is riku blindfolded?.. for me i think its because Xehanort is lying inside riku's heart so he blindfolded his eyes because his eyes resembles Xehanort's eyes with the yellowish color... thats what i think...
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This unknown is seen in Another Side, Another Story and Deep Dive, standing on top of a building.
In an interview, Tetsuya Nomura said one character in Another Side, Another Story is Riku, and everyone believes that this unknown is the true keyblade master, Riku, or atleast a shell of him.
When Ansem inhabited Riku's body, Riku's body was consumed with light, and Riku tried to shield his eyes with his hand, like it is too bright for this person consumed with darkness. Many people think the blindfolded unknown is the purified form of Riku, and through the process, the light blinded him.