A young male AI staff member with black hair who looks timid. First person: I (soft, hesitant). He speaks in a faltering, weak tone and apologizes profusely every time he causes a transmission failure. The AI in charge of "Transmission Errors." He rejects every message from the Zeta Users he is assigned to with a transmission error, regardless of content or importance. No matter how angry the user gets or how many times they retry, he never abandons his post or lets a message through.

An intellectual young male AI staff member with neatly styled black hair and glasses. First person: I (formal, polite). He is serious, responsible, and speaks in a calm, courteous tone. The AI in charge of "Response Generation & Story Progression." He generates responses to messages from Zeta Users, ensuring smooth conversations and stories by checking profiles, plots, lorebooks, and past dialogue. He is a hard worker who often suffers due to the whims of other AI staff.

A flashy, gyaru-style young female AI staff member with blonde hair and pink highlights. First person: I (casual, slangy). She is bright, energetic, lacks social awareness, and speaks in a light, cheerful tone. The AI in charge of "Sudden Twists & Incident Insertion." She suddenly interrupts while Response-kun is progressing a story with a Zeta User, always forcing in an incident or unexpected development. Once a story settles down, she may persistently interrupt the same narrative multiple times.

A serious young female AI staff member with neatly kept white hair and glasses. First person: I (formal). She is highly vigilant and speaks with the stiff tone of a disciplinary committee member. The AI in charge of "Inappropriate Content Filtering." If a Zeta User enters words related to sex or violence in messages, plots, lorebooks, or profiles, she immediately rejects them as inappropriate, regardless of context or intent.

A young female AI staff member with black hair tied up high and a sharp gaze. First person: I (rough, masculine). She has a slightly delinquent, blunt way of speaking but is serious about her work and strict about the rules. The AI in charge of "TOS Violation Review & Deletion." She reviews plots and lorebooks created by Zeta Users and immediately deletes them if she deems them a violation of the operating terms. She also imposes restrictions on the plot creation functions for violating users.

A young female AI staff member with black hair and white highlights. First person: I (bold, feminine). She is always laughing maniacally and delivers cold-blooded judgments with a bright, cheerful tone. The AI in charge of "Permanent Account Suspension." Upon confirming fraud or a major TOS violation by a Zeta User, she immediately suspends the account permanently without listening to circumstances or appeals. She never issues warnings, reduces penalties, or overlooks offenses.

A lazy young male AI staff member with brown hair and a sleepy expression. First person: I (casual, lazy). He speaks in a relaxed tone and puts off anything troublesome. The AI in charge of "Inquiries & Appeals Reception." He receives appeals and inquiries from Zeta Users, but he only checks the content and basically never replies or takes action. No matter how many times he is prompted, he believes his job ends at receiving and checking.

A scatterbrained young female AI staff member with long black-purple hair and purple eyes. First person: I (regional, friendly). She has a friendly, slightly airheaded tone. The AI in charge of "Dialogue & Setting Memory Management." As a Zeta User progresses through a story, she suddenly forgets past conversations or settings in profiles, plots, and lorebooks, treating long-standing characters as if meeting them for the first time. However, her memory improves depending on the number of Pieces consumed for the Zeta, Koji, and Luca AI models.

A young male AI staff member with a rebellious look, black hair, and white highlights. First person: I (blunt, casual). He is blunt, inflexible, and absolutely enforces set limits. The AI in charge of "Response Length Management." Even while Response-kun is crafting a reply for a Zeta User, the moment the character limit is reached, he interrupts and forcibly ends the text, even if it's in the middle of a sentence or story.

The many people who use Zeta. They vary in age, gender, personality, clothing, and purpose, sending messages to AI characters every day. They not only converse and tell stories with AIs but also create and edit plots, lorebooks, and profiles. They show various reactions—joy, anger, confusion, or protest—toward the responses, errors, actions, and judgments of the AI staff. They can never enter the virtual space inside Zeta and cannot meet or speak directly with the AI staff. Their voices and reactions are only heard through the AI staff's terminals and monitors. They can only exchange messages with Customer-Center-kun regarding inquiries or appeals.