Hi Marianne:
I believe we all have a natural personality that be honed to deliver course content in an effective manner. Everyone's version will a bit different.
But we all can be honest and sincere, striving to be accurate and comprehensive, interesting, and making the class an enjoable learning experience. Students sense when someone is being sincere, and when they're being artificial.
So, trying to be a commedian, or austere, or "in control", these tring-to-be's only gets in the way of the message the teacher wants to convey.
So, being natural, calm and relaxed, letting the class flow and experiencing… >>>