Yokoshima Naruko
from Seitokai Yakuindomo
Despite her role as a teacher and advisor of the Student Council, she is easily one of the most perverted characters in the series, probably even greater than either Shino or Aria. Naruko apparently has many lovers and aggressively seeks out younger guys, including her male students. She also happily talks about sex-related topics openly, including her various fetishes that include (among other things) bondage and outdoor sex. She is often portrayed as unreliable and useless as an educator, to the point she was allegedly put in charge of the Student Council because they were so competent they could easily make up for her incompetence.

Seitokai Yakuindomo
On his first day of high school at the formerly all-girl's Ousai Private Academy, Takatoshi Tsuda is called out for his untidy uniform by the student council president Shino Amakusa. In apology for delaying Takatoshi for his first class—and stating that the group needs a male point of view to accommodate the arrival of boys at the school—Shino offers him the position of vice president of the student council. Though unwilling, Takatoshi finds himself appointed as the newest member of the student council having yet to even step foot inside the school building. Takatoshi soon realizes that the other student council members who are more than a little strange: President Shino, who is studious and serious in appearance, but actually a huge pervert, fascinated with the erotic and constantly making lewd jokes; the secretary Aria Shichijou, who may seem like a typical sheltered rich girl, but is just as risque as the president, if not more so; and finally, the treasurer Suzu Hagimura, who may act fairly normal, but has the body of an elementary school student and is extremely self-conscious of it. Surrounded by these colorful characters, the new vice president must now work through a nonstop assault of sexual humor and insanity.