Gwen Stacy - Maika Monroe
Dang it man you stole my original idea for April!
Singular Universe - TMNT Part 1
Leonardo - Jason Biggs
Biggs did a surprisingly awesome job on the newest version of the TMNT cartoon before departing, and I'd definitely bring him back to voice Leo. He balanced Leo's teenager ways with the burdens of leadership.
Raphael - Nolan North
North was a great Raph in the TMNT animated movie. Raph was always the roughest and most "New York" of the Turtles, and North can bring that out.
Michelangelo - Greg Cipes
If you've watched the current TMNT cartoon, you know Cipes is the essence of Mikey.
Donatello - Jeremy Howard
One of the few bright spots of the Michael Bay produced movie, Howard struck the right balance of geeky and brilliant.
Splinter - Hoon Lee
Another choice from the current cartoon. Love his mix of stern knowledge and playful spirit.
April - Shaliene Woodley
The almost Mary Jane Watson would be my choice for April. A gorgeous, confident, strong person and perfect for Miss O'Neil. Plus, she's been the star of her own action franchise, so she'll be able to pick up the ninja training as April progresses.
Casey Jones - ????
He's a mystery right now. No clue on who I'd cast.
Artemis Crock/Tigress - Eliza Taylor
If you've seen The 100, you'll understand my choice. Tough as nails and beautiful to boot. And if you haven't watched The 100, I recommend it.