Riku is Sora’s and Kairi’s best friend who was tried and tested for his friendship when he became possessed by Xehanort’s Heartless. He was, however, able to overcome this darkness and became Sora’s silent ally.
He proved that he values his friendship with Sora when he used the remaining powers of darkness in his heart while capturing Roxas. He sacrificed himself, becoming a manifestation of Xehanort’s Heartless in order to complete Sora.
It actually took me a while to figure out who this character was since I’m not familiar with the game. Brilliant job with this cosplay though. I really like the hair!