Super Smash First Impressions

So, I downloaded the demo for Super Smash Brothers for 3DS.  It was overdue only because I thought you had to pay for it and only learned today that it was free.   I'm not a cheapskate, I'm poor, dammit!  

I am wondering if it is possible to unlock, in some way, characters and content beyond those things that are given to you.  I mean, I watched some play on YouTube of the Japanese version of the demo upon which you can apparently unlock things because the person on the video was demonstrating gameplay of the Duckhunt characters going through a gauntlet-run rather than just the free for all stage. I was using it as research for a fanfic (as dumb as that sounds).  

Also, the initial selection of playable characters:  Are they given to you at random or are they the same for everyone?  I got Mario, Pikachu, Mega Man, Villager and to my happiness...Mai Boi, Link.  There is also only one stage, the Battlefield, although there are two versions of it, as I found out fiddling around, a normal form and an "omega" form. 

New items amuse me greatly.  Playing Link, I got a Tanooki leaf and ... Tanooki Link, floating with his little tail is so cute!  Then there's the Fire Bar - one of those horrible, cursed things that killed me many times in Mario games turned into a badass flame-sword!  There's the Gust Bellows from Zelda.  I encountered an attack-cuccoo a couple of times but couldn't manage to grab it, though I sicced THE BEES on characters.  And, of course, there's nothing like going after people with a big ol' Ore Club.  (For those unfamiliar, it is a Kid Icarus item).  Speaking of that, I got a Daybreak one session!  

The only character I've been given that I haven't won with yet is Pikachu, and that's because he's a self-destructing little dweeb.  SO EASY to hurtle myself right off the stage with the little rat.  The way he handles for me is as one of those "too agile" characters.  

On the whole, the controls are easy.  They remind me of previous games, just in handheld form. Very easy to figure out.  

Villager.  Okay, all the variants you can choose for them...  I'm glad I played this demo before writing the third chapter of my current Super Smash Brothers fanfic.  I've started something called "Road Trip" which features a group of surviving Smash fighters/Nintendo characters on a bus trying to outrun zombies and make it to a safe zone.  Yes, it's insane, but no more so than the actual games, I think.  Anyway.... seeing those blank, unblinking eyes up close on my 3DS screen... a horde of Zombie Villagers is just begging to be written.