She also thinks you're ugly! As a matter of fact, she thinks you are the ugliest person she doesn't know. And she doesn't know a lot of people.
She doesn't like the people she knows, either. She hates everybody in Mrs. Jewls's class.
— Narration in "Kathy"
Kathy is a negative student in Mrs. Jewls' class. She does not exist in the show. It has been said she hates everyone except her classmate Sammy, who, in the books was a dead rat that did not belong to Miss Mush.
She is known to be negative, and she hates everybody, with the exception of Sammy and Mrs. Franklin. Allison has tried to befriend her, but she always is mean in return. She sometimes makes up reasons to hate people.
- In Sideways Stories from Wayside School, there is a chapter called "Kathy" which talks about how much Kathy hates everyone, but how she hates you the most.
- In Wayside School is Falling Down, there is a chapter called "Kathy and D.J." where D.J. is upset, so she tries to make him more upset, but accidentally makes him feel happier.
- In Wayside School Gets A Little Stranger, there is a chapter called "Santa Claus" where Kathy reveals she doesn't believe in Santa, but all the other students try to prove her wrong.