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Yeah man no one knows, info doesn't just fly around, there has only really been one interview with any info, and it doesn't talk of the chasers, it does confirm the knights to be totally new characters though.
No one knows what a chaser is yet. As for the Replica Riku, he was made in Reverse Rebirth( Is that right?) mode by Vexen in CoM. I don't remember why though.
knowone really knows what a chaser is; riku replica was made in kingdom hearts chain of memories to destroy sora and also when you are riku in chain of memories you fight riku replica and eventually you defeat him. you have to fight him 4 times! but they add something each time to make him harder especially the last time.
somewhere in the spoilers forum there's a link to a KH3 theory and they explain about chasers in there, im sure you could find it since it seems like a popular topic.