Riku obtained his keyblade from Terra in BBS. Riku was given a keyblade, but never obtained it due to him giving into the darkness. Because of it, Sora obtained Riku's Keyblade. He later on obtains it during Hollow Bastion when he proves to Sora that he isn't "so special." After losing it when Sora's heart proved stronger, he recieved another keyblade that can unlock hearts. He then receives his own keyblade during KH2 since Riku was able to overcome the darkness and became able to materialize his own keyblade. His keyblade has a resemblance to his Soul Eater. He keeps going on with the keyblade and eventually becomes a keyblade master before Sora, at the end of DDD.