This is a list of characters that appear in The Magic School Bus television series.
The school is located in the fictional town of Walkerville. The original book series included additional students (the class was a larger number of students; 19 students instead of 8) not seen in the TV adaptation, nor the TV tie-in books, nor the CD-ROM series.
ValerieFelicityFrizzle is a teacher at Walkerville Elementary. She is normally referred to as Ms. Frizzle, but her students sometimes call her "The Friz." While she is eccentric and a bit strange, The Friz is intelligent, kind, resourceful, happy, funny, supportive, loving and somewhat motherly. She loves making jokes revolving around the lesson she teaches, even if she is the only one laughing. She makes flamboyant entrances to start the class, causing some to remark "How does she do that?" A redhead, she wears wacky clothing that reflects the subject of each adventure and earrings that glow before a field trip begins. She usually winks before the earrings glow (in the original books, her dress on the last page usually hinted at the plot of the next book; the very last book sees it covered with question marks.) She enjoys singing, seems unafraid of danger, and often refers to her relatives or ancestors during trips. She can make a lot of jokes like Carlos, and she also admires Carlos' jokes. She appears to be very attached to the bus, almost as if having a nostalgic connection to it. She also loves to surprise the students and although she denies that she knows everything, she seems to never be in the dark about her students' activities. To Arnold, she is strange, but he and his friends still love and respect her. Some of Ms. Frizzle's ongoing catchphrases are, "Bus, do your stuff!", "Take chances, make mistakes, get messy!", "As I always say...", "Hit it Liz!" and most notably, "WAHOOOOO!"
The class pet Jackson's Chameleon who goes on most of the field trips with Ms. Frizzle and the students, often getting herself into dangerous comedic situations. She appears to get jealous when the bus receives more attention than she does. In the episode "Gets Ants In Its Pants", she is visibly annoyed and disappointed when she does not get the recognition she deserves.
Liz is mute, but often does things that one would not expect from a chameleon in real life, such as driving the bus. When she goes to Herp Haven for a brief period her packing list includes claw polish, scale moisturizer and fang-paste. If Ms. Frizzle has to leave the students for a brief period for any reason, or if the class must split up, she leaves Liz in charge, acting as a sort of substitute teacher. In "In a Pickle", she is the supposed "Judge" in Ms. Frizzle's trial for stealing Keesha's 1st prize cucumber/turning it into a pickle (she wears the wig, and the outfit, and carries the gavel).