Early sketch of the villain from "KFP2"
Jennifer Yuh Nelson spent a long time working on the first Kung Fu Panda. She describes the first picture's development as the more difficult of the two KFP features because they were developing the characters from the ground up, getting to know each one ...
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With Kung Fu Panda 2, most of the major players were in place. But there was still a new villain, about which Jennifer relates this:
... Lord Shen was one of the first things we thought about when we began work [on KFP2 three years ago. A small group of us gets together. We get a lot of snacks, and we get in a room and start spitballing ideas. In the first movie, we had Tai Lung—a guy who could walk into a room and punch someone in the face. We thought, Why don’t we go in the opposite direction—somebody who is devious, sharp, and dangerous in a different way? We made him into a peacock, a character with speed and flash. ...
She is now at work on a new project, about which she is (understandably) mum.
The interview with JYN took place in her office on the DreamWorks Animation campus. So ... audio only. The video interview above? It's a different one. (Like you couldn't tell.)