Riku is seen with the Dark Keyblade when Sora talks to him in Hollow Bastion in the original Kingdom Hearts game. However, Riku changes it when Sora fights him.
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Riku was supposed to be the Keyblade Weilder, but he had darkness in his heart.
The keyblade chooses the keyblade master, the Kingdom Key chose Sora, Way to the Dawn chose Riku, but only Kairi's keyblade didn't, Riku gave her the keyblade
well technically, Sora's Keyblade is Rikus, as Terra chose Riku, not Sora. Sora was given it as Riku gave into the Darkness. The reason his sword became a Keyblade is as he was no longer evil and could now wield a keyblade
Riku's sword is, indeed a Keyblade, a keyblade like King Mickey's that was produced from the realm of darkness. Originally it was named Soul Eater, in KIngdom Hearts: Chain of Memories. Afetr his fight with Ansem in Castle Oblivion, he then realized his heart's purpose. He was a being of Twilight. After he escaped the castle, DIZ a.k.a Ansem The Wise made Riku choose three paths, the right one to light, the middle to twilight, and the left to dark. Riku chose the middle and stated that his road is the road to dawn. It was probably during his travels, he a quired his Keyblade, which is rightly named Way to the Dawn.
He can't. That is Riku's keyblade. actually, he can because as long as you're a keyblade master, you can use anyones keyblade. for example, at the end of KH2 when sora killed Xemnas, or when riku gave kairi her keyblade.