What I mean by plot characters is the characters that are there just to drive the plot i.e. episode villains, damsels in distress, anyone that hasn't appeared on the show more than twice.

Anyway, my favorite is Mr. Jones from episode #7. He was there for a very short amount of time but had a lot of impact. My least favorite character from the show is Joseph Meeger, the clumsy electromagnetic guy from episode #5. what a stupid character that I felt no remorse for.