Instructeur Manabu is the primary host and guide of the "Tomodachi Game," overseeing its execution and explaining rules to participants like Yuuichi Katagiri and his friends, whom he draws into the game to settle their financial debts. He functions as a mysterious mascot character. His design mirrors a character from a canceled late-night anime considered too extreme for children, resulting in an unsettling visual presence often rendered in jarring CGI animation distinct from other characters. He maintains a cheerfully deliberate yet unnerving demeanor, frequently expressing amusement at the participants' psychological turmoil and betrayals. His personality includes sadistic tendencies, particularly evident when he reveals betrayals or enforces game consequences. Within the game structure, he positions the funding audience as the "Gods," the creators of the scenarios. His role involves announcing critical game events, such as debt distributions and betrayals, and enforcing penalties for rule violations like disclosing debt amounts displayed on name plates. He interacts directly with participants throughout various game stages, including "Kokkuri-San," "Backbiting Sugoroku," and "Friendship Hide-and-Seek." While part of the game's administrative hierarchy alongside figures like Tsukino and Maria Mizune, his specific background and origins remain undisclosed. The character is also variously referenced as "Sergeant Manabu" or "Professeur Manabu." His depiction remains confined to this core role.