About Sari...

Yeah, Sari Sumdac, from "Transformers Animated" is a very mysterious being. From what we know, she might not be human. Some have speculated that she's actually a robot, although she seems to be at least Partly organic, seeing that she got a cold in "Nature Calls", was nearly killed by Anti-organic Radiation in "Along came a Spider", and set off an alarm that was used for detecting organic beings in "The Elite Guard".
And according to this: [link] , Someone is NOT a girl. This definitely has something to do with Sari.

Did I ever mention that the AllSpark chose her to carry a small portion of its power? (A.K.A. her key)

And I feel that if she turned out to be a robot, we could be looking at some SariXBumblebee episodes soon.