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Dark Riku is a time-travelling replica of Riku, much like with the previous replica that was created based on Riku. Dark Riku was created to serve as a member of the real Organization XIII as one its members.
Kingdom Hearts III
Similar to the first Riku Replica, Dark Riku is identical to the real Riku in nearly every way as he appeared in the first Kingdom Hearts game. The most discernible difference between them is that Dark Riku has yellow eyes like the rest of the real Organization XIII, as opposed to Riku's aquamarine eyes, indicating that he harbors a piece of Xehanort's heart within him. He primarily wears the Organization's black coat, while also periodically shifting into his Dark Mode form at the Keyblade Graveyard.