You... are hard to keep track of. Weren't you the one that brought up the possiblity that they aren't connected?
No, I said they weren't true sequels
Like Final Fantasy X -> X-2
Correct. I guess that would feed into the hole "All worlds are connected" crap. But I suspect he is just there as a cameo since he has absolutely nothing to do with the plot.
He is tough... Think Lucifer from Nocturne x10. He has all sorts of random attacks, some that kill are you character instantly... Very challenging battle though, very good test to see how good you are at the hole press-turn system... since he comes a long with his demon army.
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I hear there's a trick to beating him, darned if I can remember how.... I came across it in an unmarked spoiler thread once