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A teacher and the supervisor of the Ousai Academy Student Council.
In Seitokai Yakuindomo, Naruko Yokoshima-sensei is the only teacher that seems to appear in the whole story. Though she supervises the Student Council, the students are surprised to see when she actually does teacher-related work.
She claims to have worked to become a teacher after being inspired by stories of a idealistic teacher who reforms a class full of delinquents, but there weren't that many to be found in the school when she came to be a teacher. So when Ousai Academy became a co-ed school, she decided to move on to her next passion: trying to seduce school boys.
Despite being a raging pedophile, Yokoshima's blunt sexual comments fit in with the other members of the Student Council.