They actually explain the whole "Leon" thing in Kingdom Hearts. If you read his profile in Jimminy's Journal they say that after Squall failed to save his world from the unknown menace that was the heartless, he fled in shame and changed his name so no one would recognize him as the man who...
I would definitely buy any downloadable content for DMC4. I was actually curious to see if Capcom was going to release anything sometime in the near future. I guess I'm still keeping my fingers crossed.
I personally love Dante's ****y attitude, I find it quite entertaining.
Sid is definitely annoying but Dante can't kill him even though we all know he wants to.
I like Lady, her and Dante's teetering love/hate relationship is hilarious.
I'm not a big fan of Nero but eh...