I love how "dash dancing" is considered an "advanced" technique.

"Now mash the control stick wildly back and forth"
"OK...What does it do?"
"Oh...nothing. It just makes you look like an idiot. We call it playing mind games."

Looks like 15 or so on the character select screen, and it doesn't look like there's room for secret characters to appear.
Yeah, like Assertn said: Demo != final product.