Yu-Gi-Oh! anime, manga or movie only characters

Shotaro Akaboshi
Shotaro Akaboshi (赤星 昇太郎, Akaboshi Shōtarō) is a collector that steals Miho's watch. Dark Yugi comes to get it back.

Yujīn Krabs
Yujīn Krabs (ユジンー・クラブズ Yujīn Kurabuzu) is the second game master, who has good luck with a television game show. Yujin pushes around Yugi and his friends until Yugi challenges him to a Shadow Game involving a game show. He ends up losing. After losing, Yujīn no longer has good luck on the TV game show and loses his champion title. Later, during the final Death-T episode, Aileen Rao and Ryuichi are paired against Miho and Jonouchi. Jonouchi and Ailean have the battle suits while Miho and Ryuichi are at the controls. Jonouchi and Miho defeat Aileen and Yujīn.

Dr. Kekeru Goyu
Dr. Kekeru Goyu (豪遊 カケル, Gōyū Kekeru) does not properly take care of Shizuka, Jonouchi's sister. The doctor had fired Nurse Miyuki. The doctor loses to Dark Yugi in a putt-putt game. Dr. Goyu goes insane.

Haiyama
Haiyama (灰山) is a boy who manipulates Kujirada while pretending that the opposite is going on. Haiyama is defeated by Dark Yugi in a digital pet duel.

Kageyama sisters
The Kageyama sisters are three witches who want to have the three Hecate witch cards. Risa Kageyama (影山 リサ, Kageyama Risa) wants to take Yugi's Violet Hecate (バイオレット ヘカテー, Vioretto Hekatē) card. After pretending to be Yugi's friend, Risa reveals herself to be one of the sisters. Yugi, with the Millennium Puzzle taken away from him, is forced into a Duel Monsters game with the Kageyama sisters. Yugi is about to lose when Kaiba appears and takes over. Kaiba defeats the Kageyama sisters in Duel Monsters, explaining that he should be the one to defeat Yugi.

Kaoruko Himekoji
Kaoruko Himekoji (姫小路 薫子, Himekoji Kaoruko), being supported by the chairman of the student council, tries to win a beauty contest at her school. When she prevents Miho from going onto the final round by ripping her beautiful dress apart, Yugi gets angry at her and plays a Shadow Game with her.

Mayumi
Mayumi is a girl who wants to give a love letter to Jonouchi. She asked Anzu and Miho about him and they questioned her liking in Jonouchi. Still, they asked Yugi for help seeing as Yugi was Jonouchi's friend. Yugi took them to his grandfather's game shop and his grandfather, Sugoroku gave them a blank puzzle, telling Mayumi she could write a message on it and give it to Jonouchi to figure out. He also stated it was how he got Yugi's grandmother to like him.

Later, Mayumi slips the present into Jonouchi's desk when they get to class. But when Jonouchi finds it, the teacher Ms. Chono, takes it and says she will figure it out, then read the message. Anzu stands up and says that Ms. Chono shouldn't be reading other people's messages and says she was the one who gave Jonouchi the gift.

Ms. Chono later called Anzu into her office telling her it was against the rules to bring something like that to school. Anzu complains the rules are too strict and says she will make a petition to lessen the strictness in the school rules. But, a few bullies write bad words over her signs and break her petition board. Yugi and Jonouchi support her and Jonouchi fights the bullies. Ms. Chono sees them fighting and calls them to her office. She says that they were in trouble. Yugi, Anzu, and Jonouchi complain it wasn't their fault. Ms. Chono lets them leave and calls in the bullies. She thanks them for doing what they did to Anzu and pardons them. Yugi overhears and is in shock.

He turns into Yami Yugi. Yami Yugi comes out and accuses Ms. Chono for using her authority to hurt Anzu. They make a deal to play a game: if Yami wins Chono will leave Anzu alone, and if Chono wins Yugi will be expelled. The game was to put together a broken mirror. Except blindfolded. Yami gives her a pair of gloves and a blindfold. They both begin. But in the middle of the game, Chono takes off her blindfold and unfairly finishes the puzzle. Yami Yugi tells her it is a Shadow Game and the consequences will be very dire. After Chono unfairly finishes the mirror puzzle Yami Yugi stands up, telling her she cheated and used her authority to hurt others and that underneath her beautiful face she was completely ugly. As a result, Chono's face mask cracks and her truly ugly face is revealed. She screams when she sees her reflection and runs.

Later, Jonouchi asks Anzu why she gave him the love letter puzzle. Anzu claims it was a joke. Mayumi later tells Anzu and Miho she is no longer interested in Jonouchi after how she saw how he treated her gift earlier.

Aileen Rao
Aileen Rao (アイリーン・ラオ, Airīn Rao) is a Canadian-Indian dancer and who also happens to be the 3rd game master. Kaiba tells Aileen, who returns from a Paris fashion show, to play a game against Yugi. Aileen first pretends to be a soccer player named "Heida" (平田) in Rijinhai, a fictional version of chess from India. Aileen states that if he wins, Irene must submit to his will, but if Aileen wins, Heida will lose the most important thing to him. Aileen wins and Heida is seen injured in a hospital on TV. Aileen lures Yugi and Anzu, who is a big fan of Aileen, to her condominium. Aileen holds Anzu hostage and forces Yugi to play Rijinhai. Aileen tells the same thing to Yugi: if he loses, he will lose the most important thing to him. Aileen threatens to kill Anzu with a tiger if Yugi loses. Yugi wins and Aileen lets go of Anzu. Aileen acknowledges Yugi as a good player. Later, during the final Death-T episode, Aileen and Ryuichi Fuha are paired against Miho and Jonouchi. Jonouchi and Aileen have the battle suits while Miho and Fuha are at the controls. Jonouchi and Miho defeat Aileen and Ryuichi.

Miyuki Sakurai
Miyuki Sakurai (桜井 美雪, Sakurai Miyuki) is a nurse whom Jonouchi falls in love with but is heartbroken when she leaves to be with her boyfriend after she is fired from her job by Dr. Goyu; Miyuki is taken, causing Jonouchi heartbreak.

Ridley Sheldon
Count Ridley Sheldon (リドリー・シェルダン伯爵, Ridorī Sherudan Hakushaku), from London in the United Kingdom, is the first game master. Count Sheldon has a collection of dolls that he admires a lot. Sheldon's favorite doll, Fiona 「フィオナ」, has a blonde doll dressed up in a Victorian Outfit. Count Sheldon disguises one of his dolls as the school nurse. Sheldon defeats Yugi in a Duel Monsters game, taking his Neon Knight as a reward. Later, Seto kidnaps Yugi, whom is in the arcade looking for a new game called "KIS", so Yugi could face Count Sheldon again. Dark Yugi defeats Sheldon and placing a Shadow Game on the loser. Fiona's face is cracked after the duel with Yugi is over.

Student Council Chairman
The chairman (大味) is a boy who wants Kaoruko Himekoji to win the student beauty contest. He is competing against fellow student council member Honda, who is pushing for Miho to win.

Tetsu Tasaki
Tetsu Tasaki, also known as Tetsu the Hedgehog (針ねずみのテツ), is a person who is framed by Jiro. Jiro disguises himself as Tetsu and breaks out of prison. While Tetsu also breaks out of prison and commits some robberies, Tetsu is being framed for a variety of crimes that were committed by Jiro. Tetsu has to prove his innocence.

Warashibe
Warashibe (童部, Warashibe) is a student who is infatuated with Miho Nosaka, and is good at Capsule Monster Chess. Warashibe has a habit of sucking on lollipops.