yes
There is no villain hunt in Lego batman.
The Lego company has stopped making Lego batman but you can still buy them at amazon. As of 2012, Lego also started a DC Superheroes and Super-villains theme. The link can be found below. You'll find some Batman sets ;)
Yes, you can.
On ds,go to arkham asylum.
Sadly, Lego Batman is not manufactured any more, however a great place to buy Lego Batman is Ebay.
only on lego stores
Ebay
No, you can only buy 'Catwoman' on the game.
You can play as the villains in Lego Batman you must first complete a full episode as heroes, then you unlock the same episode from the villains' perspective. If you need any further help, feel free to use this walkthrough from the link below.
you play as her and the joker in the 1st level of jokers story in the villains area
No, Spider-Man is not a character in LEGO Batman 2: DC Super Heroes. The game primarily features characters from the Batman universe as well as other DC Comics superheroes and villains.
Yes, Lego Superhero sets are available to buy in Legoland.