This article is from the My So-Called Life FAQ, by Richard Evans firstname.lastname@example.org with numerous contributions by others.
MR. RICHARD KATIMSKI:
The new English teacher (Rickie and Rayanne's period and moderator of
the Drama club. Master of...strange pauses mid-sentence. He is
sheltering Ricky at his apartment.
MS. CATHY KRZYZANOWSKI:
Rayanne's drug counselor. Also, teacher of some class none of the
main characters are in. Substituted for English class (Angela,
Jordan, and Brian's period) in "Father Figures" [1.4].
MS. RENEE LERNER:
Angela's geometry teacher, who subbed for English until Mr. Katimski
was hired. Dressed as Obi-Wan Kenobi for Halloween (though nobody got
the joke). Was interested in Mr. Katimski. (Was "Mrs. Lerner" until
1.9 when she was listed as "Ms. Lerner.")
Principal of Liberty High. Not a man to be trifled with.
Social studies teacher. Teaches U.S. History. According to Angela,
he's incredibly boring.
MS. MARIAN CHAVATAL:
The biology teacher. She's the one in the lab coat.
Spanish teacher who substituted for English class in "The Zit" [1.5].
Read Kafka's "The Metamorphosis" to the class.
The English teacher and yearbook moderator seen only in the pilot.
She quits her job sometime after that, and the havoc this causes is
seen in later episodes.