It was a casual observation when I made it in reference to Teacher's Pet but now it applies in (at least) two of the first six episodes I'd like to declare it as a rule.

Rules of Buffy # 1: If you’re an extremely nice minor character in Buffy then you’re either a demon or about to die at the hands (or claws, teeth, pincers) of a demon.

Farewell Principal Flutie... you will be missed