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I wouldn't say that. I know Xion and Riku Replica were made by Vexen. But there could be more made. I always assumed Xion was made by Vexen because she turned in ice looking crystals when she died. Yet the Riku one didn't, then again, they do say that Xion was an imperfect clone, unlike Riku Replica. So maybe that's why we could see her turn to ice.