Only Sense Online

ユン

Yun, whose real name is Shun, is an androgynous high school student that started playing Only Sense Online due to his best friend, Taku. When he registered for the game, he intended to name his character Syun only to mistype it and was left with the name Yun. To make matters worse, Only Sense incorrectly identified Yun as female after scanning his body. Without Yun modifying his character (or even looking at what his character would look like), OSO automatically applied a 10-20% beautification to make him more feminine. Both Myu and Sei refused to let him redo his character and he was blackmailed into playing as a girl. Not that anyone cares, really, because Shun as Yun has far more girl power than anyone. Even as he explains to every person he meets that he is not a girl, no one believes him, and the people he knows from RL make no effort to support his claims.

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マギ

Magi is a female blacksmith whose specialties are making metallic equipment such as metal based weapon and armor. She played the β version.

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ミュウ

Myu, whose real name is Miu, is a girl in her third year of middle school and a high level gamer. In Only Sense Online she plays a paladin character build of her own, although her image of paladins is a little unorthodox. During an event as a β tester she distinguished herself as a hero and gained the alias "Silver Paladin". After the official launch she used her knowledge of the game to start leveling with the goal of getting back to the level she was on the β.

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Taku is Yun's childhood friend, and is also friends with his sisters. They go to class together and frequently when they meet up in real life, they talk about games (whenever they aren't talking about school).

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Yun's and Myu's older sister who also is an avid gamer who has gone away for college. She played in the beta as a mage and continued to do the same once the full release of the game came out. She largely uses water and ice magic and healing magic when necessary, but also occasionally fights in melee with her staff.

Bio from Fandom, licensed CC BY-SA