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'''Ms. Chono''', known in the English version of the [[Yu-Gi-Oh! Dungeon Dice Monsters|''Dungeon Dice Monsters'' video game]] as '''Miss Lynn Medusa''', is a teacher at Domino High School. She is known as the '''The Wicked Witch of Expel''' ('''Lynn, the Expelling Witch''' in the English ''DDM'' game), since she expelled fifteen students over the course of six months.  Her beautiful appearance is due to the immensely thick layer of makeup make-up she wears, which covers her true, ugly face. She also enjoys dating, but the part she likes the best was to dump the men to see them cry. Typically, she is somewhat sadist.

[[File:Ms. Chono true face.jpg|left|thumb|110px|Ms. Chono's true facebeing revealed]]Ms. Chono was furious about getting dumped by a man she dated, before she got a chance to do it the other way around, and decided to vent her anger on the students with a desk check, hoping to see them scared and finding a chance to expel them for finding "cool" things such as cigarettes, lipsticks, and condoms. She found a [[love jigsaw puzzle]] on [[Miho Nosaka]]'s desk, and asked who it belonged to.  She claimed that if the sender would confess, she may forgive him, which was a lie-she planned to expel the sender anyway. [[Yugi Mutou (manga)|Yugi Mutou]], [[Katsuya Jonouchi (manga)|Katsuya Jonouchi]] and [[Hiroto Honda (manga)|Hiroto Honda]] all stood up, and indicated that the puzzle came from each of them. Not believing them, Chono decided to finish the puzzle to determine who the gift was from.  [[Dark Yugi (manga)|Dark Yugi]] emerged from the Puzzle and turned the gift into a [[Shadow Game]], where Chono felt the pain she was inflicting on others as she worked on the puzzle. When she finished the puzzle, her makeup turned into puzzle pieces and fell off, revealing her ugly face beneath. The other students laughed at her, causing her to run out of the room, stating that the class never happened, and that she would get anyone who exposes her secret. Yugi later emerged, unable to remember what had happened and seemed confused that class was over. Although Miho turned Honda down, this formed the basis for his permanent friendship with Yugi.<ref>{{chapter|Yu-Gi-Oh!|7|ref}}</ref>

In the anime, the gift was supposed to be from a girl named [[Mayumi (first series)|Mayumi]] to Jonouchi but [[Téa Gardner|Anzu]] actually made it as Mayumi didn't know what to give Jonouchi.  When Anzu complains complained about the strictness of the school, Chono asks asked Anzu to collect signatures from other students in a petition asking for laxer rules. Chono then orders ordered some boys to rip up Anzu's signature paperin exchange for erasing their rule-breaking from their permanent records. Dark Yugi challenges emerged and challenged Chono to a game involving two mirrors and being blindfolded. Her face cracks cracked after cheating (she took off her blindfold during the game) to reveal her ugly face.She later returned to get her make-up on again. When she reacted angrily to a proposal, insisting things had to be stricter, Chono's face began to crack, causing her male colleagues to remark that there was more make-up than skin on her face <ref>{{episode|Yu-Gi-Oh!|10|ref}}</ref>

She later appears with [[Ryuichi Fuha]] and again gets her face cracked againalthough her ugly self is not seen. It's instead used to introduce the next scene.<ref>{{episode|Yu-Gi-Oh!|12|ref}}</ref>