Miss Finster is an assistant teacher who is the children's constant nemesis on the playground. Archetypal authoritarian teacher personality, Miss Finster has a strong desire for a school in which children aren't allowed to have fun or act like children. She is feared by all the children, and is always closely followed by her teacher's pet, the equally nefarious Randall C. Weems, who is also largely disliked by the other students. In terms of inter-personal relationships, Miss Finster has been shown to have a crush on the school's janitor, Hank and is friends with Spinelli's parents. Of particular note is that she used to have a much sunnier disposition and throughout the series glimpses of this are seen with occasional references to her experiences in Guam. Despite her old age, Finster is an accomplished boxer and is generally in excellent physical condition. She keeps a punching bag in her bedroom. Former Navy commodore from 1952 to 1954. (Korean War.)

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Miss Finster 3

Voice: Wiseguy 

Friends: Principal Prickly, Miss Grotke, TJ Detweiler, Vince LaSSao, Ashley Spinelli, Gretchen Grundler, Mikey Blumberg, Gus Griswald, Randall Weems and Menlo

Enemies: Earwin Lawson, Gelman, Conrad Mundy, Greg Skeens, Sue Bob Murphy, Lazy Kid, Chucko Kowalski, Jocko, Buster, Cheay, Koreo and Kurst the Worst 

Likes: Children, Halloween, rules, spending time with her friends, her weekend scheduled, behaving children, quiet and Randall spying the students when they misbehaving

Dislikes: Troublemakers, students cussing in class especially Lawson, Gelman, Mundy and Skeens, misbehaving children, being the butt of any prank, children having fun, her ex-boyfriend (Dr. Phillium Benedict) and students getting her arrested 

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