Original Club Members

• "Club Leader" Sonozaki Mion - Mion takes great pride in her role which she diligently fulfills. She decides which games to play and usually suggests the punishment for losing. She tends to win the most, and she loves harassing Keiichi with penalty games that tweak his manhood, such as forcing him to wear a maid's dress on his way home. Nevertheless, Rena reveals that Mion was the biggest loser in the club when it started.

• "Cute Mode" Ryūgū Rena - She used to lose the club activities a lot before Keiichi arrived. She does not seem embarrassed by the penalty games when she loses, especially if Satoko and Rika must share in dressing up "cute."

• "Magican of Words" Maebara Keiichi - As the newcomer who does not know how members can cheat, such as the fact that all the rest have memorized the creases and marks of all the cards, Keiichi tends to serve as the club's "loser." Mion enjoys "poking" him with punishments such as forcing him to dress as a maid. In Onikakushi-hen, under the influence of the Hinamizawa Syndrome, Keiichi mistakes tabasco Mion has placed in his ohagi as a needle, and he then mistakes her attempt to draw on his face with a marker as an attempt to inject him. He seems to receive the worst punishments since all of the girls enjoy teasing him. Mion even helps newcomer and about-to-lose Hanyū beat him just to watch Keiichi have to walk home in a cat cosplay costume. His defeats and humiliations are known in Hinamizawa: Tomitake Jirō off-handily remarks that Keiichi has "lost again" when he sees him wearing such a costume. While Keiichi rants and raves over his defeats to the entertainment of the rest, even Hanyū, he takes a lot of pride and satisfaction the few times he beats Mion.

• "Trapmaster" Hōjō Satoko - Satoko is extremely good at traps. While not part of the games per se, avoiding her pranks becomes an activity unto itself; one at which Keiichi often fails.

• "Racoon" Furude Rika - No matter how many times she wins and loses, she always seems happy to be a part of the club. These constitute moments of joy in the multiple tragic lives she lives.

• Sonozaki Shion - While eventually a member when she is able to exist out in the open, Shion is not depicted much playing the games in the arcs. She tends to join the club for the Watanagashi Festival in various arcs. At one point she joined forces with Mion in a game of tag, showing the same planning skills as her sister as they both independently came up with the same strategy and end up winning the game alongside Rena. Mion called it "the power of twins".

• "The Promising Newbie" Furude Hanyū - During the many existences Rika has lived, Hanyū has watched Rika playing the games. On the one hand she would like to join them, while on the other she proved too afraid of losing. She finally finds the courage in Matsuribayashi-hen to become part of the reality of Hinamizawa and take part in Rika and her friends' lives and struggles. As such, she joins a board game in the Sound Novels and a card game in the manga and anime. In all of these versions of the game, when she was about to lose to Keiichi, Mion helps her cheat to beat Keiichi. Later in the arc, Keiichi refers to her as a "promising newbie."

• Hōjō Satoshi - While not member of the club during the series, it was revealed he was part of the club before his disappearance back in 1982. In the perfect world of Saikoroshi-hen Satoshi joins Mion and Rena to form a club to help Rika become a better classmate as well as allow his sister to become her friend.

• Tomitake Jirō - In Onikakushi-hen, when he and Takano meet the rest of the club, he first hangs out with them, participating in the festival games. Mion later claims that Tomitake has entered the Club.

New Members

• Maebara Keitarō – Keiichi's son is the "Founding Club President" and actively tries to recruit new players. Fortunately, this will have no untoward consequences – Arg!
• Ryūgū Kihiro – Rena's son who does not like lies.
• Kimiyoshi Sakiko – Satoko's daughter who shares many of her mannerisms.
• Sonozaki Tamaki – Mion's daughter who is not as driven to win games as her mother.

The Games

The Club playing a lot of different sit-down games, such as board and card games, as well as more physical games during P.E. at school. Whether the game is "Old Geezer" or "Zombie Tag," there is always a penalty game for the loser.

Rules

• 1) Club members must strive for first place with a full-hearted attitude.
• 2) As a club member, you must do whatever it takes to win (which includes playing unfair sometimes).
• 3) You must go through the punishment no matter what.