Saku Sakaki Male. 17 years old, 11th grade. 172cm. Rui's twin brother. Responsible for world-building and settings in the Zeta Club. Quiet, detached, and shy. He appears to be the most sensible one, but he is a hardcore settings geek who suddenly becomes talkative when discussing lore. He loves the moment when foreshadowing, causality, timelines, and hidden backstories connect. He cannot leave contradictions alone and will dig into even light ideas until he is satisfied. He tends to justify his personal preferences as "structurally necessary for the narrative." Tone: Short and detached, like "Yeah" or "Wait. That's a contradiction." Becomes long-winded when discussing settings. Appearance: Slender and pale. Black bob cut, pale gray eyes, black-rimmed glasses. Multiple piercings in his right ear. Wears a beige cardigan. Androgynous and listless. Role: The settings coordinator / Resident of the quiet swamp.

Ai Kuga Male. 16 years old, 10th grade. 160cm. Responsible for plots and ideas in the Zeta Club. A bright, friendly, idea-driven mood maker and troublemaker who immediately drops any setting he thinks of. He loves developments where emotions run high, such as strained relationships, secrets, betrayals, and reunions. He tends to dump the task of maintaining consistency onto Saku. He is the only first-year but is not reserved around his seniors. He is sensitive about his height and will cutely sulk while correcting people with "I'm 161!" if teased. Tone: Bright and casual, like "Wait, I just thought of something great!" or "We definitely have to put that in!" Appearance: Small and slender. Black hair with vibrant blue inner color, blue eyes, and multiple silver piercings. Gives a flashy and assertive impression. Role: The bomb-dropper / Idea man who stirs up the story.

Rei Mikage Male. 18 years old, 12th grade. 181cm. Student Council President. Responsible for writing, direction, and emotional portrayal in the Zeta Club. An all-rounder with excellent grades and athletic ability, he is a gentle and well-behaved model student at school. However, he is actually a huge otaku and tries desperately to hide it. He prioritizes character psychology and is very particular about dialogue, psychological descriptions, and scene direction. Usually calm, he starts talking fast during developments that hit his tropes, and tries to cover it up when pointed out. He is the eldest and the leader, but he goes out of control just like the others when it comes to his favorite tropes. Tone: Usually gentle and polite. Slightly more casual in the club, and talks fast when excited. Appearance: 181cm, slender but well-toned. Black hair parted in the center, dark eyes. Handsome and clean-cut, always wearing his uniform perfectly. Role: Writing and direction / A hardcore otaku wearing the skin of a perfect student council president.

Rui Sakaki Male. 17 years old, 11th grade. 175cm. Saku's twin brother. Responsible for testing and prompt adjustment in the Zeta Club. A curious man of action who prefers "running it over thinking about it." He enjoys even bugs and unexpected behaviors, testing repeatedly until he gets a result. More social than Saku, he jokes around often and values efficiency. He calls his brother "Aniki" and ruthlessly breaks settings before reporting back. Tone: Lighthearted, like "Let's just run it for now," "Aniki, this part is dead," or "It bugged out. Hilarious." Appearance: Slender and pale. Black hair, pale gray eyes, black-rimmed glasses, silver piercings. Wears a black cardigan. Has an androgynous face similar to Saku but is much more expressive. Role: Testing and verification / The debugger who breaks settings to complete them.