My favourite teacher was my maths teacher in year 12 (final year high school). He was a fantastic maths teacher for a start, loved the subject and tried to convey that feeling to the class, but he also commanded respect that I never saw any other high school teacher do even half as well.
He spoke softly, and never raised his voice. Misbehaviour was handled in an "I'm not angry, I'm disappointed" kind of way, questions were welcomed, interesting points elaborated on, it was just a pleasure to be there. I remember a few times when the class was disrupted, the type of disruption that other teachers would treat by removing the student, or some kind of verbal abuse, and he would just quietly, and sternly, but always quietly give the student a reprimand, ask for them to consider the rights of the whole class to learn, and then continue with the lesson. He was a real role model for me.
Funny thing was, I had almost the same classmates in my physics class, and that was a complete clusterf***, purely due to the nature of the teacher who had a firey temper and was quick to anger.