Radiation-Immune Mutants: Characters already altered by chemicals, such as Joker or Two-Face, can't be harmed by radioactive waste.While the third was not released around the time of any film, it was released in honor of Batman's 75th anniversary it also had DLC promoting The Dark Knight, Man of Steel, Arrow, and the then-upcoming Suicide Squad. Product Placement: Batman was timed to tie in with The Dark Knight and Batman 2 with The Dark Knight Rises.Laura Bailey channels both Arleen Sorkin and Tara Strong as Harley Quinn.
And, of course, Rob Paulsen as the Riddler is doing his Jim Carrey impression mixed with a bit of Gilbert Gottfried. No Celebrities Were Harmed: Steve Blum and Christopher Corey Smith both channel Mark Hamill as the Joker, with Blum also channeling a combination of Burgess Meredith and Danny DeVito as the Penguin.Fully subverted, and in fact more along the lines of Balance Buff, in DC Super-Villains, where Scarecrow gains some new abilities more in line with his skillset, such as Fear powers almost on par with a Yellow Lantern (though without the building ability), while Riddler and Mad Hatter retain their abilities from the third game along with getting character-relevant new ones.
Scarecrow makes no appearance at all outside of the Nolanverse DLC character, though that version has explosives. This is amended in Batman 3 where Hatter and Riddler regain their mind control, and Riddler has a throwable cane and super senses, while Hatter gains playing cards to throw.