Mrs. Willis is a teacher at John P. Tristate Elementary. She is a character who appears in the Phineas and Ferb spin-off series Phineas and Ferb: School Dayz!. Mrs. Willis teaches one of the classes that Phineas and Ferb go to and she takes her job as an elementary school teacher a little bit too seriously, as she can be very strict and can get angry pretty easily. Although she may do this, she really does just want to have fun with her class and make everyone there happy, but she's unaware of how she doesn't do very good at that. The two students that give her the hardest time at her school are Wesley and Corey although she also has it out for Phineas and Ferb, not liking their antics and over the top schemes to make school more fun. So, she kind of fills in for Candace by contantly tryin