Raph- special agent OSO!! a guy who fights and a wierd bear!
Leo- just himself
Donnie- Booble from tinker bell and denzel from Henry Huggle monster
Mikey- beast boy from teen titans
Splinter- just himself
April- tinker bell Katara from avatar and Shanti from the jungle book
Shredder- Trigon Ravens dad Mr. Gus from uncle grandpa Dark laser from fairy odd parents Maurice from madagascar
Rob Paulson(Donnie's Voice Actor) was also the Original Raphael from the 1987 Tmnt. He is also the blue bottomed boobie character from Tuff Puppy, Carl from Jimmy Neutron, Mark Chang from The Fairly Odd Parents, Sir Kirby from Doc Mcstuffins. and much more!
Greg Cipes( Mikey's Voice Actor) was the lead singer in a band he formed back in his hometown(Coral Springs Florida) called Cipes And The People.
Sean Astin( Raph's Voice Actor) was also in The Goonies.
and Jason Biggs( Leo's Voice Actor) was also well Known as the guy in the movie American Pie who F*** the pie!