Seitokaichou

生徒会長,

She is a smart, bespectacled girl whose real name has not been revealed. Despite her timid demeanor, she managed to win her position with a speech that sounded threatening to the rest of the student body. She constantly throws up procedural barriers for the Pastimers Club, and wavers between trying to be friends with them or undermining their club.

(Source: Wikipedia)