Marguerite "Cokie" Mason is an eighth-grade student at Stoneybrook Middle School. She is the chief rival and tormenter of the Baby-sitters Club. She is responsible for a number of pranks on the club, including sending sending ominous chain letters to spook Mary Anne in Mary Anne's Bad-Luck Mystery, and sending creepy love notes to Kristy in Kristy's Mystery Admirer. She has a crush on Logan and dated him briefly during Mary Anne and Logan's break-up (Mary Anne Misses Logan). She is a poor student and may or may not know how to read.

Cokie's best friend is Grace Blume.

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