Hey mate. You might wanna watch the TV series for some ideas there. There are a lot of sites that have the entire thing up, otherwise it should be on Netflix. You'd like it. Lots of character development, esp with Shifu. 

Shame Viper gets like, no lines, but thats what you get when you bother with celeberties. They could replace Monkey's movie VA with the one who used to voice Jackie Chan from Jackie Chan Adventures (Which is why he gets like, the 2nd or 3rd most lines of everyone), but you can't do much with Lucy Lu.

I can't get a good picture of what I wanna do, so... yeah.