In this page you will find all the unlockable characters locations that are in the entire game. You will need to unlock all the villains and heroes to be able to open the golden doors, gather minikits, collect bricks and much more. If you are missing one character then you might get into some trouble when you try to move up in the levels. Not all the characters can be unlocked during the progression of the game some you will need to purchase to unlock them. Below you can find how to unlock all the characters in in Lego Batman DC Super Heroes.
For more help with completing the game, unlocking items and locations then take a look at the Lego Batman 2 DC Super Heroes Walkthrough or locations of all Red Bricks, Gold Bricks, Minikit Vehicles, Citizens in Peril.