The beauty of the Bat is how extensive and distinctive his rogue's gallery is.
- Danny Devito still works as a more traditional Penguin.
- I was going to suggest Nimoy as the Riddler but I realize there's a villain he'd be better suited for. Ra's Al Ghul. Anyone familiar with his work as Xehanort from the Kingdom Hearts games would know that he'd be perfect to bring the scheming immortal to life. Even if David Warner is the One True Ra's in my book.
- Robert Englund as Scarecrow seems to be a good choice even if the movies that'd make him such a perfect choice wouldn't exist in TTL.
Odd thought then if you have Nimoy as Ra's Al Ghul have a Bane based more around the Nolan version with a twist Bruce was the chosen replacement Bane the disregarded one who grew jealous and takes over after Ra's death but is driven by the need to beat The Batman and prove to himself he is the true heir and have him played by a young Liam Neeson I'm picturing Darkman sorta.