When it came to being on the ball, well, Xion had been in the Organization. Even if she'd been kept in the dark about some things, there had been missions every day, and training in recon--a far cry from the peaceful life Sora had led before his adventures.

There probably were a lot of similarities between her and Sora's styles, though mostly unintentional. Considering that she did still have Sora's memories, sparring with Riku would probably feel familiar as well. Those two had grown up sparring and competing with each other, so they knew each others' styles well.

One way she did differ from her Original was that she wasn't quite as competitive...but that didn't mean she was going to turn down Riku's invitation to take the first move. "Okay."

She started with a simple strike, one that would land on his side if he didn't manage to block. He probably could, but best to start small.