What I'm doing is mixing a little bit of the Nolan(verse) with the Animated series. So here we go.....
Terry McGinnis/Batman-Jake Gyllenhaal
I felt bringing in an experienced actor such as him would be fitting for such a character. He's also got the build, the look, and the voice for it. And I know you guys would think "Wait, Terry's 17-18 yrs. old. But to me he's always looked like he looked much older so I wanted to cast him as someone who's just about ready to go to college and get a "job."
Bruce Wayne-Kevin Conroy
Now this might seem like an odd choice due to his "not being big and buff" but that's why Hugh Jackman exercised for Wolverine. Kevin has had experieced acting too. Not just voice acting. Plus we finally get to see him play Batman.
Flashback
Joker-Crispen Glover
I've always felt that Glover would be a great Joker and deserved a shot at the role. But I think if he would be any Joker, he would be a perfect Batman Beyond Joker
Tim Drake-Stellan Skarsgard
Another great actor with the look and the voice. Of course he'll have to speak English.
Young Tim Drake/Robin/Joker Jr.-Jake T. Austin
He's got quite a bit of experience and certainly looks the part.
Commissionner Barbra Gordon-Judi Dench
I've always loved Dench. She would be my top choice. If not her, then Helen Mirren.
Barbra Gordon/Batgirl-Kristen Bell
Now, I'm sure there's some confusion in this choice. Thinking she'd be a better Harley Quinn than Batgirl, but seeing her roles, playing someone that's crazy like Quinn would be way too easy for her. I think having her play as Batgirl would be a better challenge for her. In my opinion, she could pull it off.
Dana-Sophie Wu
I've seen her in other small roles besides Kick-Ass (like Wild Child and the other Man) and she'd be a perfect Dana.
Harley Quinn-Malin Akerman
Uh-huh. Yep. She's experienced in the superhero genre and certainly can play as the Joker's pet.
Dee-Dee-Dakota Fanning
She now at an age where this role is perfect for her. And of course, she's one of the most talented young actresses out there.
Chucko-David H. Lawrence XVII
This guy's a good actor at playing creepy roles like jokerz. He would be a perfect Chucko.
Ghoul-Paul Dano
Another great actor who can fit the profile of a scrawny but freaky jokerz.
Woof-Andy Serkis
Golem, Caesar. This guy is born to play viscious roles like Woof
Mrs. McGinnis-Sally Field
I've always felt she'd be better playing Terry's mom more than Spiderman's Aunt. For some reason it suits her better.
Matt McGinnis-Allen Alvarado
Had to choose a kid who best looked the part so I chose Alvarado.