(These two roles have the same voice, so they will be played by the same person. These lines listed are not conversations, they are separate from each other.)
Riku: Riku is a calm, cool, collected teenager who is not afraid to go beyond his limits. In Kingdom Hearts Re:Chain of Memories, Riku makes many self-realizations, one of which is that he had let his heart become weak, and sometime after that, he would shy away from the darkness within it. Through his battles in Castle Oblivion, he makes another big realization: he can’t get rid of the darkness in his heart, and decides to use it without turning away from the light like before, declaring his path down the “road to dawn”, also signifying his effort for redemption. Additionally, he forms a strong bond with Mickey during their time together in Castle Oblivion, and later begins to address him familiarly throughout the rest of the series.
Riku Replica: Created by Vexen, this replica is much more aggressive and protective than the original Riku, which is exactly what Xehanort’s Heartless was looking for. This version of Riku embraces the darkness and wields it very effectively. Like Sora, he seems to get angry when confused, as shown when the Organization members such as Larxene tried to trick him. At the end of his life, the replica became much more like the original, sullen and mellow. He often lashed out at anyone who talked back to him, even if they overpowered him.