Bump, bump, bumpity, bumpy, boomp, beump, bumpy, bump, bump, bump...
I've just found the key to writing Sesame Street characters! OK so, this may seem obvious to some, but the key is, the characters are totally innocent. They may not be totally void of occasional sarcasm and they get physically exhausted, but they are completely void of cynicism. They live in their own little worlds, have they're personalities and beliefs, but none of them are tainted by the world. They may get upset sometimes, and unfortunate things like bullying, death, or racism may occur, but they always remain wide-eyed, curious, and ambitious. They don't have a cynical bone in their bodies. Once I figured that out, it made it much easier for me to come up with stories for them, and write them in an accurate way.