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Oh, I don't know about Okubo being different, or at least not from any number of authors. There's nothing at all unusual in basing a character of aspects of yourself.
Not at all sure about your claim about the piano. For a start, the piano first turns up when the 'demon' invites Soul to play it for the power it would give him. The times when he does so include those when he turns insanity to his and Maka's advantage; the fight with Crona, the Clown chapters, and against Arachne. I think there's a clear connection there between the piano and Soul's insanity. And unless I'm missing something, I think the link is that using the one allows him to control the other.
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